Karl Halvor Teigen

• Hohle, Sigrid Møyner & Teigen, Karl Halvor (2018). More than 50% or Less than 70% Chance: Pragmatic Implications of Single-Bound Probability Estimates. Journal of Behavioral Decision Making.  ISSN 0894-3257.  31(1), s 138- 150 . doi: 10.1002/bdm.2052 Vis sammendrag

  Probability estimates can be given as ranges or uncertainty intervals, where often only one of the interval bounds (lower or upper) is specified. For instance, a weather forecaster can describe La Niña as having “more than 70% chance” or “less than 90% chance” of occurring. In three experiments, we studied how research participants perceived climate related forecasts expressed with lower-bound (“over X% chance”) or upper-bound (“under Y% chance”) probability statements. Results indicate that such single-bound statements give pragmatic information in addition to the numeric probabilities they convey. First, the studies show that these statements are directional, leading the listeners’ attention in opposite directions. “Over” statements guide attention towards the possible occurrence of the event, and are explained by reasons for why it might happen, while “under” statements direct attention to its possible non-occurrence, and are more often explained by reasons for why the target event might not appear, corresponding to positive (it is possible) vs. negative (it is uncertain) verbal probabilities. Second, boundaries were found to reveal the forecaster’s beliefs, and could be perceived as indicative of an increasing or a decreasing trend. Single-bound probability estimates are therefore not neutral communications of probability level, but might “leak” information about the speaker’s expectations, and about past and future developments of the forecast.

• Hohle, Sigrid Møyner & Teigen, Karl Halvor (2018). When probabilities change: Perceptions and implications of trends in uncertain climate forecasts. Journal of Risk Research.  ISSN 1366-9877. Vis sammendrag

  Past research has revealed a trend effect when people are faced with a revised probabilistic forecast: A forecasted event that has become more (vs. less) certain is taken to signal a trend towards even stronger (weaker) certainty in future revisions of the forecast. The present paper expands this finding by exploring the boundary conditions of the trend effect and how it affects judgments of the forecaster. In Study 1, the trend effect was shown to persist when receivers process the forecast more deliberately, by considering reasons for the revision. In Study 2, trend continuation was predicted even when the two forecasts were made by different experts at different points in time. Study 3 demonstrated that the effect disappears when receivers are given an earlier forecast disrupting the linearity of the trend (e.g., a 60%-70% sequence preceded by a 70% forecast). In Study 4, two forecasters were perceived as more in agreement when revising divergent probabilities in the same rather than in opposite directions. If the event occurs, a forecast with downgraded probability (e.g. from 50% to 40%) was judged to be less accurate than an equally uncertain single forecast (40%). These results demonstrate the robustness of the trend effect based on two forecasts, affecting not only receivers' expectations of what comes next, but also their perceptions of the forecaster and of forecast accuracy. The findings have implications for how people communicate and understand risks and other uncertain events in areas such as climate science, weather prediction, political science and medicine.

• Nilsen, Connie Villemo; Friborg, Oddgeir; Teigen, Karl Halvor & Svartdal, Frode (2018). Textual health warning labels on snus (Swedish moist snuff): do they affect risk perception?. BMC Public Health.  ISSN 1471-2458.  18(564) . doi: 10.1186/s12889-018-5461-2 Fulltekst i vitenarkiv.
• Nordbye, Gro Hege Haraldsen; Riege, Anine H. & Teigen, Karl Halvor (2018). Better safe than sorry: Risking irresponsibility by seeking uncertainty.. Journal of Behavioral Decision Making.  ISSN 0894-3257.  31, s 87- 99 . doi: 10.1002/bdm.2049
• Teigen, Karl Halvor (2018). The unbearable lightness of finger movements: Commentary to Dolinski. Social Psychological Bulletin.  ISSN 2569-653X.  13(2) . doi: 10.5964/spb.v113i2.26110 Vis sammendrag

  In the target article, Doliński showed that empirical studies of “real” behaviour are an almost extinct species of research, judged from articles published in the most recent volume of JPSP (Journal of Personality and Social Psychology). This finding continues a trend identified by Baumeister and colleagues ten years ago. The reliance on self-reports and rating scales can hardly be explained as an aftermath of the cognitive revolution in psychology, or a preoccupation with measurements and advanced statistical analyses, as Doliński suggests, but is more compatible with the ease of collecting questionnaire data, combined with the pressure to publish large multi-study papers and to obtain approval from ethical review boards. This development is further strengthened by the accessibility of online participant pools. An informal count showed that students participating for course credit were in 2006 involved more than 90% of empirical JPSP studies, as against 22.5% in 2017. In contrast, Amazon Mechanical Turk workers, non-existent in 2006, participated in 55.3% of the empirical studies published in the most recent volume. Parallel to this development the number of participants per study and the number of studies per article have vastly increased.

• Teigen, Karl Halvor (2018). Vurdering: lite sannsynlig. Verbale (u)sannsynligheter gjennom 30 år.. Psykologisk tidsskrift.  ISSN 1501-7508.  22(2), s 58- 65
• Teigen, Karl Halvor; Filkukova, Petra & Hohle, Sigrid Møyner (2018). It can become 5 oC warmer: The extremity effect in climate forecasts. Journal of experimental psychology. Applied.  ISSN 1076-898X.  24(1), s 3- 17 . doi: 10.1037/xap0000149 Vis sammendrag

  Climate projections and other predictions are often described as outcomes that can happen, indicating possibilities that are imaginable, but uncertain. Whereas the meanings of other uncertainty terms have been extensively studied, the uses of modal verbs like can and will have rarely been examined. Participants in five experiments were shown graphs and verbal statements showing projections of future global warming, sea level rise, and other climate-related issues. All studies gave support for the extremity hypothesis, which states that people use can-statements to describe the topmost values in a distribution of outcomes, regardless of their actual probabilities. Despite their extremity, outcomes that can happen are believed to have a substantial likelihood of occurrence. The extremity effect was replicated in two languages (Norwegian and English), and with several related terms (can, possible, could, may). The combination of extremity and exaggerated likelihood conveyed by such statements could lead to serious miscommunications.

• Teigen, Karl Halvor; Løhre, Erik & Hohle, Sigrid Møyner (2018). The boundary effect: Perceived post hoc accuracy of prediction intervals. Judgment and decision making.  ISSN 1930-2975.  13(4), s 309- 321 . doi: http://journal.sjdm.org/17/171211/jdm171211.pdf Vis sammendrag

  Predictions of magnitudes (costs, durations, environmental events) are often given as uncertainty intervals (ranges). When are such forecasts judged to be correct? We report results of four experiments showing that forecasted ranges of expected natural events (floods and volcanic eruptions) are perceived as accurate when an observed magnitude falls inside or at the boundary of the range, with little regard to its position relative to the “most likely” (central) estimate. All outcomes that fell inside a wide interval were perceived as equally well captured by the forecast, whereas identical outcomes falling outside a narrow range were deemed to be incorrectly predicted, in proportion to the magnitude of deviation. In these studies, ranges function as categories, with boundaries distinguishing between right or wrong predictions, even for outcome distributions that are acknowledged as continuous, and for boundaries that are arbitrarily defined (for instance, when the narrow prediction interval is defined as capturing 50 percent and the wide 90 percent of all potential outcomes). However, the boundary effect is affected by label. When the upper limit of a range is described as a value that “can” occur (Experiment 5), outcomes both below and beyond this value were regarded as consistent with the forecast.

• Bruckmüller, Susanne; Hegarty, Peter; Teigen, Karl Halvor; Böhm, Gisela & Luminet, Olivier (2017). When do past events require explanation? Insights from social psychology. Memory Studies.  ISSN 1750-6980.  10(3), s 261- 273 . doi: 10.1177/1750698017701607 Fulltekst i vitenarkiv.
• Hohle, Sigrid Møyner & Teigen, Karl Halvor (2017). The trend effect: When a forecast is revised, people believe it will continue changing, In A.-K. Römpke (ed.),  Outlooks on Applying Environmental Psychology Research.  Bundesamt für Naturschutz.  ISBN 978-3-89624-197-9.  Chapter 5.  s 35 - 41
• Løhre, Erik & Teigen, Karl Halvor (2017). Probabilities associated with precise and vague forecasts. Journal of Behavioral Decision Making.  ISSN 0894-3257.  30(5), s 1014- 1026 . doi: 10.1002/bdm.2021 Vis sammendrag

  Forecasts of future outcomes, such as the consequences of climate change, are given with different degrees of precision. Logically, more precise forecasts (e.g., a temperature increase of 3–4°) have a smaller probability of capturing the actual outcome than less precise forecasts (e.g., a temperature increase of 2–6°). Nevertheless, people often trust precise forecasts more than vague forecasts, perhaps because precision is associated with knowledge and expertise. In five experiments, we ask whether people expect highly confident forecasts to be associated with wider or narrower outcome ranges than less confident forecasts (Experiments 1, 2, and 5), and, conversely, whether they expect precise forecasts to be issued with higher or lower confidence than vague forecasts (Experiments 3 and 4). The results revealed two distinct ways of thinking about confidence intervals, labeled distributional (wide intervals seen as more probable than narrow intervals) and associative (wide intervals seen as more uncertain than narrow intervals). Distributional responses occurred somewhat more often in within-subjects designs, where wide and narrow prediction intervals and high and low probability estimates can be directly compared, whereas separate evaluations (in between-subjects design) suggested associative responses to be slightly more frequent. These findings are relevant for experts communicating forecasts through confidence intervals.

• Riege, Anine Cecilie & Teigen, Karl Halvor (2017). Everybody Will Win, and All Must Be Hired: Comparing Additivity Neglect with the Nonselective Superiority Bias. Journal of Behavioral Decision Making.  ISSN 0894-3257.  30(1), s 95- 106 . doi: 10.1002/bdm.1924
• Teigen, Karl Halvor (2017). Judgments by representativeness, In Rüdiger F. Pohl (ed.),  Cognitive illusions: Intriguing phenomena in thinking, judgment and memory.  Routledge.  ISBN 978-1-138-90342-5.  Chapter 11.  s 204 - 222
• Teigen, Karl Halvor; Böhm, Gisela; Bruckmüller, Susanne; Hegarty, Peter & Luminet, Olivier (2017). Long live the king! Beginnings loom larger than endings of past and recurrent events.. Cognition.  ISSN 0010-0277.  163, s 26- 41 . doi: 10.1016/j.cognition.2017.02.013 Fulltekst i vitenarkiv. Vis sammendrag

  Events are temporal “figures”, which can be defined as identifiable segments in time, bounded by beginnings and endings. But the functions and importance of these two boundaries differ. We argue that beginnings loom larger than endings by attracting more attention, being judged as more important and interesting, warranting more explanation, and having more causal power. This difference follows from a lay notion that additions (the introduction of something new) imply more change and demand more effort than do subtractions (returning to a previous state of affairs). This “beginning advantage” is demonstrated in eight studies of people’s representations of epochs and events on a historical timeline as well as in cyclical change in the annual seasons. People think it is more important to know when wars and reigns started than when they ended, and are more interested in reading about beginnings than endings of historical movements. Transitional events (such as elections and passages from one season to the next) claim more interest and grow in importance when framed as beginnings of what follows than as conclusions of what came before. As beginnings are often identified in retrospect, the beginning advantage may distort and exaggerate their actual historical importance.

• Teigen, Karl Halvor & Løhre, Erik (2017). Expressing (un)certainty in no uncertain terms: Reply to Fox and Ülkümen. Thinking and Reasoning.  ISSN 1354-6783.  23(4), s 492- 496 . doi: 10.1080/13546783.2017.1314965
• Løhre, Erik & Teigen, Karl Halvor (2016). There is a 60% probability, but I am 70% certain: Communicative consequences of external and internal expressions of uncertainty.. Thinking and Reasoning.  ISSN 1354-6783.  22(4), s 369- 396 . doi: 10.1080/13546783.2015.1069758 Vis sammendrag

  Current theories of probability recognize a distinction between external (un)certainty (frequentistic probabilities) and internal (un)certainty (degrees of belief). The present studies investigated this distinction in lay people’s judgments of probability statements formulated to suggest either an internal (“I am X% certain”) or an external (“It is X% certain” or “There is a X% probability”) interpretation. These subtle differences in wording influenced participants’ perceptions and endorsements of such statements, and their impressions of the speaker. External expressions were seen to signal more reliable task duration estimates, and a lower degree of external than internal certainty was deemed necessary to advise a course of action. In conversations about football, internal expressions were perceived as signaling more personal interest, and were expected to be on the average 10% higher than corresponding external probabilities. Finally, people who reported their outcome expectations for two major sports events let their degree of interest in these events influence their internal but not their external certainty. These results have implications for the communication of uncertainty and probability.

• Magnussen, Svein; Eilertsen, Dag-Erik; Teigen, Karl Halvor; Stridbeck, Ulf & Wessel, Ellen Margrethe (2016). Urimelig tvil: et tilsvar. Tidsskrift for rettsvitenskap.  ISSN 0040-7143.  129, s 300- 305
• Hohle, Sigrid Møyner & Teigen, Karl Halvor (2015). Forecasting forecasts: The trend effect. Judgment and decision making.  ISSN 1930-2975.  10(5), s 416- 428 Fulltekst i vitenarkiv. Vis sammendrag

  People often make predictions about the future based on trends they have observed in the past. Revised probabilistic forecasts can be perceived by the public as indicative of such a trend. In five studies, we describe experts who make probabilistic forecasts of various natural events (effects of climate changes, landslide and earthquake risks) at two points in time. Prognoses that have been upgraded or downgraded from T1 to T2 were in all studies expected to be updated further, in the same direction, later on (at T3). Thus, two prognoses were in these studies enough to define a trend, forming the basis for future projections. This “trend effect” implies that non-experts interpret recent forecast in light of what the expert said in the past, and think, for instance, that a “moderate” landslide risk will cause more worry if it has previously been low than if it has been high. By transcending the experts’ most recent forecasts the receivers are far from conservative, and appear to know more about the experts’ next prognoses than the experts themselves.

• Kanten, Alf Børre & Teigen, Karl Halvor (2015). A Magnitude Effect in Judgments of Subjective Closeness. Personality and Social Psychology Bulletin.  ISSN 0146-1672.  41(12), s 1712- 1722 . doi: 10.1177/0146167215609894 Vis sammendrag

  Events can be far away from or near an observer in several respects: they can be distant or close in a spatial, temporal, social, or hypothetical sense. They can also vary in magnitude, physically or in terms of impact and importance. We examine the existence of a general effect of perceived magnitude on judgments of subjective closeness. Studies 1-4 show that proximity judgments, of any type, are affected by the severity of an event so that a highly severe event will be described as closer than a less severe one. Study 5 demonstrates the Magnitude Effect for positive events. Finally, Study 6 shows that the effect can be extended to distances between comparable events, in addition to the distance from an observer to an event. We see the Magnitude Effect as a spillover from the scales used to describe events to the scales used to describe distances.

• Larsen, Kim Sverre & Teigen, Karl Halvor (2015). Hvorfor misforstås forskning om selvmord?. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  52(7), s 607- 612
• Teigen, Karl Halvor (2015). Framing of numerical quantities, In Gideon Keren & George Wu (ed.),  The Wiley Blackwell Handbook of Judgment and Decision Making.  Wiley-Blackwell.  ISBN 978-1-118-46839-5.  Chapter 20.  s 568 - 589
• Teigen, Karl Halvor; Løhre, Erik & Hohle, Sigrid Møyner (2015). Det (u)sikre og det (u)sannsynlige: Hva forskerne sier og hva de (kanskje) mener. Impuls : Tidsskrift for psykologi.  ISSN 0801-2911.  68(1), s 33- 42
• Løhre, Erik & Teigen, Karl Halvor (2014). How fast can you (possibly) do it, or how long will it (certainly) take? Communicating uncertain estimates of performance time. Acta Psychologica.  ISSN 0001-6918.  148, s 63- 73 . doi: 10.1016/j.actpsy.2014.01.005
• Magnussen, Svein; Eilertsen, Dag-Erik; Stridbeck, Ulf; Teigen, Karl Halvor & Wessel, Ellen Margrethe (2014). «UTOVER RIMELIG TVIL»? En kvantitativ studie av sikkerhet i bevisvurdering i straffesaker hos norske fagdommere og lekdommere. Tidsskrift for rettsvitenskap.  ISSN 0040-7143.  127, s 384- 396
• Magnussen, Svein; Eilertsen, Dag-Erik; Teigen, Karl Halvor & Wessel, Ellen Margrethe (2014). The Probability of Guilt in Criminal Cases: Are People Aware of Being 'Beyond Reasonable Doubt'?. Applied Cognitive Psychology.  ISSN 0888-4080.  28(2), s 196- 203 . doi: 10.1002/acp.2978
• Nordbye, Gro Hege Haraldsen & Teigen, Karl Halvor (2014). Being responsible versus acting responsibly: Effects of agency and risk taking on responsibility judgments. Scandinavian Journal of Psychology.  ISSN 0036-5564.  55(2), s 102- 114 . doi: 10.1111/sjop.12111 Vis sammendrag

  In three experimental studies, with managers and students as participants, we explore in this article the relation between two kinds of responsibility judgments, called Responsibility 1 (R1) and Responsibility 2 (R2). Decision makers can be viewed as being more or less responsible for their choice and its consequences (R1). Their actions can also be evaluated, from a normative point of view, as instances of more or less responsible behavior (R2). Experiment 1 showed that managers who depart from the default or “normal” course of action, by choosing a new (versus familiar) alternative, changing (versus sticking to) an initial decision, or going against (versus following) the advice of a management team, are rated as more responsible (R1) for the outcomes of their decision. At the same time, they are perceived to act in a less responsible way (R2). Experiment 2 compared decision makers choosing between more or less risky options. High risk takers were held more responsible (R1) for their choice and for its consequences, but were again viewed as behaving in a less responsible way (R2) than low risk takers. In Experiment 3, participants judged decision makers who followed or opposed others’ advice by choosing either a high or a low risk option. Opposing others’ advice led to higher R1 and lower R2 scores, especially when choosing the high risk option, moderated by outcome (successful decisions appearing more responsible than those that went wrong). Thus R1 and R2 judgments should be distinguished as having different and sometimes even opposite determinants.

• Nordbye, Gro Hege Haraldsen & Teigen, Karl Halvor (2014). Responsibility judgments of wins and losses in the 2013 Chess Championship. Judgment and decision making.  ISSN 1930-2975.  9(4), s 335- 348 Vis sammendrag

  We report two studies on the perceived responsibility of opponents competing for a goal that can be attained by only one of them. Responsibility judgments were collected in seven samples of lay people and experts before, during, and after the World Chess Championship in 2013. Participants assessed the responsibility of the two players, their supporting teams,local conditions, and chance factors for four hypothetical outcomes (large and small loss/win for each player), along With probabilities for these outcomes, demonstrating subadditivity (sums exceeding 100%) in all samples, even among chess experts. The winner was consistently perceived to be more responsible than the loser, and more for outcomes with large than small margins. There was also an effect of focal player, as Carlsen was given more responsibility both for losses and wins than Anand, by the present (Norwegian) pro-Carlsen samples. However, this effect could be modified by describing the outcomes as Anand’s (rather than Carlsen’s) wins and losses. Thus the study adds to the valence framing literature by showing how responsibility judgments are affected by the way outcomes are framed.

• Riege, Anine Cecilie; Sulutvedt, Unni & Teigen, Karl Halvor (2014). Format dependent probabilities: An eye-tracking analysis of additivity neglect. Polish Psychological Bulletin.  ISSN 1641-7844.  45(1), s 12- 20 . doi: 10.2478/ppb-2014-0003 Vis sammendrag

  When people are asked to estimate the probabilities of uncertain events, they often neglect the additivity principle, which requires that the probabilities assigned to an exhaustive set of outcomes should add up to 100%. Previous studies indicate that additivity neglect is dependent on response format, self-generated probability estimates being more coherent than estimates on rating scales. The present study made use of eye-tracking methodology, recording the movement, frequency and duration of fixations during the solution of ten additivity problems and two control tasks. Participants produced more non-additive estimates in the Scale format than in the Self-generated format. Self-generated estimates also led to longer decision time and a higher number of repeated inspections, suggesting a deliberate comparison process. In contrast, the Scale format seemed to encourage a case-based approach where each outcome is evaluated in isolation.

• Teigen, Karl Halvor (2014). When very likely is not so likely. Nature Climate Change.  ISSN 1758-678X.  4, s 421- 422 . doi: 10.1038/nclimate2256 Vis sammendrag

  The International Panel of Climate Change has issued guidelines for communicating probabilities with words. But readers all over the world think the words mean something different.

• Teigen, Karl Halvor; Juanchich, Marie & Filkukova, Petra (2014). Verbal probabilities: An alternative approach. Quarterly Journal of Experimental Psychology.  ISSN 1747-0218.  67(1), s 124- 146 . doi: 10.1080/17470218.2013.793731 Vis sammendrag

  Previous studies of verbal probabilities have tried to place expressions like a chance, possible, and certain on 0-1 numerical probability scales. We ask instead, out of a range of outcomes which outcome does a verbal probability suggest. When, for instance, a sample of laptop batteries lasts from 1.5 to 3.5 hours, what is a certain and what is a possible duration? Study 1 showed that speakers associate certain with low values and possible with (unlikely) high or maximal values. In Study 2 this methodology was applied to several positive and negative verbal probability phrases, showing a preference for high rather than low or middle values in a distribution. Study 3 showed that such maxima are not universally described by large numbers. For instance, maximum speed is often described in terms of a small number of time units. What can (possibly) happen is accordingly sometimes described with very low and sometimes with very high values, depending upon focus of interest. Finally, participants in Study 4 were given the role of hearers rather than speakers, and asked to infer outcome ranges from verbal probabilities. Hearers appeared to be partly aware of speakers’ tendencies to describe outcomes at the top of the range.

• Juanchich, Marie; Teigen, Karl Halvor & Gourdon, Amélie (2013). Top scores are possible, bottom scores are certain (and middle scores are not worth mentioning): A pragmatic view of verbal probabilities. Judgment and decision making.  ISSN 1930-2975.  8(3), s 345- 364 . doi: http://journal.sjdm.org/12/12522/jdm12522.pdf Vis sammendrag

  In most previous studies of verbal probabilities, participants are asked to translate expressions such as possible and not certain into numeric probability values. This probabilistic translation approach can be contrasted with a novel which-outcome (WO) approach that focuses on the outcomes that people naturally associate with probability terms. The WO approach has revealed that, when given bell-shaped distributions of quantitative outcomes, people tend to associate certainty with minimum (unlikely) outcome magnitudes and possibility with (unlikely) maximal ones. The purpose of the present paper is to test the factors that foster these effects and the conditions in which they apply. Experiment 1 showed that the association of probability term and outcome was related to the association of scalar modifiers (i.e., it is certain that the battery will last at least..., it is possible that the battery will last up to...). Further, we tested whether this pattern was dependent on the frequency (e.g., increasing vs. decreasing distribution) or the nature of the outcomes presented (i.e., categorical vs. continuous). Results showed that despite being slightly affected by the shape of the distribution, participants continue to prefer to associate possible with maximum outcomes and certain with minimum outcomes. The final experiment provided a boundary condition to the effect, showing that it applies to verbal but not to numerical probabilities.

• Kirkebøen, Geir; Vasaasen, Erik & Teigen, Karl Halvor (2013). Revisions and Regret: The Cost of Changing your Mind. Journal of Behavioral Decision Making.  ISSN 0894-3257.  26(1), s 1- 12 . doi: 10.1002/bdm.756 Vis sammendrag

  Decision reversals often imply improved decisions. Yet, people show a strong resistance against changing their minds. These are well established findings, which suggest that changed decisions carry a subjective cost, perhaps by being more strongly regretted. Three studies were conducted to explore participants’ regret when making reversible decisions, and to test the hypothesis that changing one’s mind will increase post-outcome regret. The first two studies employed the Ultimatum game and the Trust game. The third study used a variant of the Monty Hall problem. All games were conducted by individual participants playing interactively against a computer. The outcomes were designed to capture a common characteristic of real life decisions: they varied from rather negative to fairly positive, and for every outcome it was possible to imagine both more and less profitable outcomes. In all experiments, those who changed their minds reported much stronger post-outcome regret than those who did not change, even if the final outcomes were equally good (Experiments 2 and 3) or better (Experiment 1).This finding was not due to individual differences with respect to gender, tendency to regret, or tendency to maximize. Previous studies have found that those who change from a correct to wrong option regret more than those who select a wrong option directly. This study indicates that this finding is a special case of a more general phenomenon: Changing one’s mind seems to come with a cost, even when one ends up with favourable outcomes.

• Riege, Anine H. & Teigen, Karl Halvor (2013). Additivity neglect in probability estimates: Effects of numeracy and response format. Organizational Behavior and Human Decision Processes.  ISSN 0749-5978.  121(1), s 41- 52 . doi: 10.1016/j.obhdp.2012.11.004 Vis sammendrag

  When people are asked to estimate the probabilities for an exhaustive set of more than two events, they often produce probabilities that add up to more than 100%. Potential determinants for such additivity neglect are explored in four experiments. Additive responses vary between experimental conditions, mainly as a result of response format, with a scale format leading to fewer additive responses than a list format with self-generated, written probabilities. Participants with high numeracy scores produced more additive responses, especially after being primed with a numeracy scale. Additivity neglect for 100% sums appears to be unrelated to other subadditive judgments, like non-additive disjunctions. We conclude that additivity neglect is caused by a case-based approach, which comes natural in real-life situations where the full set of outcomes is not available.

• Teigen, Karl Halvor & Filkukova, Petra (2013). Can > will: Predictions of what "can" happen are extreme, but believed to be probable. Journal of Behavioral Decision Making.  ISSN 0894-3257.  26(1), s 68- 78 . doi: 10.1002/bdm.761 Vis sammendrag

  Predictions of uncertain events are often described in terms of what can or what will happen. How are such statements used by speakers, and what are they perceived to mean? Participants in four experiments were presented with distributions of variable product characteristics, and asked to generate natural, meaningful sentences containing either will or can. Will was typically associated with either low or intermediate numeric values, whereas can consistently suggested high (maximum) values. For instance, laptop batteries lasting from 1.5 to 3.5 hours “will” last for 1.5 hours or for 2.5 hours, but they “can” last for 3.5 hours. The same response patterns were found for positive and negative events. In will-statements, the most frequent scalar modifiers were “at least” and “about”, whereas can-statements included “up to” as the most frequent modifier. A fifth experiment showed that will indicates an outcome that may be “certain”, but more often simply “probable”. Can means “possible”, but even can-statements are perceived to imply “probable” outcomes. This could create a communication paradox since most speakers use “can” to describe outcomes that because of their extremity are at the same time quite unlikely.

• Teigen, Karl Halvor; Juanchich, Marie & Riege, Anine H (2013). Improbable outcomes: Infrequent or extraordinary?. Cognition.  ISSN 0010-0277.  127(1), s 119- 139 . doi: 10.1016/j.cognition.2012.12.005 Vis sammendrag

  Research on verbal probabilities has shown that unlikely or improbable events are believed to correspond to numerical probability values between 10% and 30%. However, building on a pragmatic approach of verbal probabilities and a new methodology, the present paper shows that unlikely outcomes are most often associated with outcomes that have a 0% frequency of occurrence. Five studies provide evidence that when people complete or evaluate statements describing “improbable” outcomes, based on outcome distributions or expected ranges, they favour extraordinary outcomes that have not occurred in the original sample. For quantitative outcomes that can be ordered on a unipolar dimension, an improbable outcome is typically perceived as having a higher outcome value than those observed. Thus when battery life for a sample of laptop batteries is shown to range from 2.5 to 4.5 hours, 5 or 6 hours are considered better examples of “improbable” duration times than those that actually occur in 10% of the cases. Similarly, an improbable exam grade is one that has not yet been observed, rather than one that has been obtained by a small percentage of students. And when climate experts claim that a 100 cm increase in sea level by the year 2100 is “improbable”, participants believe that the same experts’ maximum estimates will be much lower. We conclude that judgments of what is improbable suggest outcomes beyond the expected range, rather than simply low frequency outcomes. These results are compatible with a causal (propensity) interpretation rather than a statistical (frequency) interpretation of probabilities.

• Filkukova, Petra & Teigen, Karl Halvor (2012). Interpretations of can and will in consumer communication about risks and benefits, In Karen S. Patrick Knutsen; Sigmund Kvam; Peter Hans Langemeyer; Kåre Solfjeld & Anastasia Parianou (ed.),  Narratives of Risk: Interdisciplinary studies.  Waxmann Verlag.  ISBN 978-3-8309-2803-4.  Kapitell 11.  s 275 - 305
• Halkjelsvik, Torleif; Rognaldsen, Maren & Teigen, Karl Halvor (2012). Desire for control and optimistic time predictions. Scandinavian Journal of Psychology.  ISSN 0036-5564.  53(6), s 499- 505 . doi: 10.1111/j.1467-9450.2012.00973.x Vis sammendrag

  Few studies have investigated individual differences in time predictions. We report two experiments that show an interaction between the personality trait Desirability of Control and reward conditions on predictions of performance time. When motivated to perform a task quickly,participants with a strong desire for control produced more optimistic predictions than those with a weaker desire for control. This effect could also be observed for a completely uncontrollable task. The results are discussed in relation to the finding that power produces more optimistic predictions, and extend this work by ruling out some previously suggested explanations.

• Teigen, Karl Halvor (2012). Risk communication in words and numbers, In Karen S. Patrick Knutsen; Sigmund Kvam; Peter Hans Langemeyer; Kåre Solfjeld & Anastasia Parianou (ed.),  Narratives of Risk: Interdisciplinary studies.  Waxmann Verlag.  ISBN 978-3-8309-2803-4.  Kapittel 9.  s 240 - 254 Vis sammendrag

  This article reviews experimental research about how people perceive risk, how they describe the probabilities involved, and how their descriptions are understood by recipients of the communication. In technical and scientific contexts, risks are typically described in terms of numbers (such as probabilities and prevalences). In areas where exact numbers are not known, or not applicable, speakers prefer probabilistic verbal expressions, such as small risk, very likely, or even vaguer phrases such as X is possible or X can happen. However, people’s interpretations of such phrases are extremely variable, and are often taken to imply other levels of risk than intended. In this article we review research showing how particular phrases are chosen by speakers, and the way they are understood by recipients, with particular focus on communication problems. For instance, speakers typically use ‘possible’ and ‘can’ to describe the worst or the best outcomes, which (because of their extremity) are quite rare, but people who hear or read such statements may think they describe likely outcomes. ‘Unlikely’ is typically used for outcomes at the top or above the range of potential outcomes, whereas ‘certain’ often denotes a low value that will at least occur.

• Halkjelsvik, Torleif; Jørgensen, Magne & Teigen, Karl Halvor (2011). To Read Two Pages, I Need 5 Minutes, but Give Me 5 Minutes and I will Read Four: How to Change Productivity Estimates by Inverting the Question. Applied Cognitive Psychology.  ISSN 0888-4080.  25(2), s 314- 323 . doi: 10.1002/acp.1693
• Kirkebøen, Geir & Teigen, Karl Halvor (2011). Pre-outcome Regret: Widespread and Overlooked. Journal of Behavioral Decision Making.  ISSN 0894-3257.  24, s 267- 292 . doi: 10.1002/bdm.694
• Låg, Torstein & Teigen, Karl Halvor (2011). Helseinformasjon og helsekommunikasjon, I: Frode Svartdal (red.),  Psykologi i praksis.  Gyldendal Akademisk.  ISBN 978-82-05-41572-0.  Kapittel 6.  s 51 - 56
• Teigen, Karl Halvor (2011). Beslutninger under usikkerhet, I: Frode Svartdal (red.),  Psykologi i praksis.  Gyldendal Akademisk.  ISBN 978-82-05-41572-0.  kapittel 36.  s 301 - 306
• Teigen, Karl Halvor (2011). Common sense og vitenskap, I: Frode Svartdal (red.),  Psykologi i praksis.  Gyldendal Akademisk.  ISBN 978-82-05-41572-0.  Kapittel 31.  s 273 - 279
• Teigen, Karl Halvor (2011). Flaks og uflaks - bare tilfedigheter?. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  48(11), s 1072- 1079 Vis sammendrag

  Good and bad luck: When the incidental looks intentional The article briefly reviews theories and usages of the concept of luck in psychology. People have contrasting conceptions of luck, either equating it with pure chance (Luck 1), or as a magical force producing success and failures in a purposeful way (Luck 2). Whereas Luck 1 is an unpredictable and uncontrollable external factor, Luck 2 appears partly controllable through superstitious practices or as a personal characteristic. Such beliefs can foster self-confidence. The events explained by these concepts are typically outcomes that are contrasted with worse counterfactual alternatives. Participants in an experiment were shown pictures of a spectacular car accident on the edge of a cliff, along with a set of descriptive headlines. They gave top ratings to headlines involving luck and higher powers. Increasing the severity of close counterfactuals appears to facilitate a shift from Luck 1 to Luck 2.

• Teigen, Karl Halvor (2011). Hukommelse og glemsel, I: Frode Svartdal (red.),  Psykologi: En introduksjon. 2. utgave.  Gyldendal Akademisk.  ISBN 978-82-05-40529-5.  Kapittel 7.  s 107 - 117
• Teigen, Karl Halvor (2011). Hva er psykologi, I: Frode Svartdal (red.),  Psykologi: En introduksjon. 2. utgave.  Gyldendal Akademisk.  ISBN 978-82-05-40529-5.  Kapittel 1.  s 15 - 28
• Teigen, Karl Halvor (2011). ”Jeg står på spranget til erobringer bestandig”. Fra Anathon Aalls dagbøker II: 1893-1900. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  48(3), s 232- 237
• Teigen, Karl Halvor (2011). "Min time er endnu ikke kommen". Fra Anathon Aalls dagbøker I: 1881-1893. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  48(2), s 130- 135 Vis sammendrag

  The Institute of psychology at the University of Oslo was founded in 1909 by Anathon Aall (1867-–1943), shortly after his appointment as a professor in philosophy. This first part of a biographical article follows Aall’s development from school age up to his graduation from the university, based on hitherto unpublished material from his diaries. A student of theology, Aall aimed for an academic career focusing on the historical roots of Christianity. He also had some literary ambitions, and was since his boyhood a close friend of Norwegian poet Sigbjørn Obstfelder. The diaries describe his conflicts with his mother, his concerns about family members, his youthful dreams about women, his views on contemporary literature, and his struggles for academic recognition. Aall pictures himself as a person with an exceptional sense of duty, and was sure he had a vocation in life, but was uncertain about which one.

• Teigen, Karl Halvor (2011). Persepsjon: Hvordan vi oppfatter omgivelsene, I: Frode Svartdal (red.),  Psykologi: En introduksjon. 2. utgave.  Gyldendal Akademisk.  ISBN 978-82-05-40529-5.  Kapittel 4.  s 59 - 72

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• Teigen, Karl Halvor (2017). Terningen er rund: Bedømmingspsykologi i tretten kapitler. Cappelen Damm Akademisk.  ISBN 978-1-138-90342-5.  252 s.
• Teigen, Karl Halvor (2015). En psykologihistorie 2. utgave. Fagbokforlaget.  ISBN 978-82-450-1704-5.  474 s.

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• Teigen, Karl Halvor (2018). How are experts' uncertainty intervals perceived by non-experts?. Vis sammendrag

  Estimated project costs can be described as an uncertainty interval where low (minimum), middle (expected or most likely) and high (maximum) values are specifically indicated (e.g., corresponding to P15, P50, and P85 in a cumulative probability distribution). We report the results of a questionnaire study where experts’ estimated costs for a road project, illustrated by a bell-shaped graph, were presented to several educated samples (including students, employees in a major construction company, and judges). In line with findings from other domains, they underestimated the span of the uncertainty interval, and yet they believed that actual outcomes outside of this interval, especially excess costs, would be likely. When asked to suggest outcomes corresponding to verbal phrases, like “entirely probable”, “not surprising” and “could cost”, they mostly selected extreme values (at the top of the uncertainty distribution). Outcomes inside, or at the boundaries of an uncertainty interval were regarded as accurately predicted, while outcomes outside indicated that the estimates were wrong. It is concluded that even well-defined probabilistic estimates cannot be assumed to be understood as intended, even by educated readers, due to lay notions of probabilities, categorical thinking and the colloquial meaning of verbal terms

• Teigen, Karl Halvor (2018). The language of uncertainty - after 30 years.
• Teigen, Karl Halvor; Andersen, Bjørn & Alnes, Sigurd Lerkerød (2018). Hvordan oppfattes og omtales usikre kostnadsestimater?.
• Magnussen, Svein; Eilertsen, Dag-Erik; Stridbeck, Ulf; Teigen, Karl Halvor & Wessel, Ellen Margrethe (2017). Misforstått kritikk. Tidsskrift for rettsvitenskap.  ISSN 0040-7143.  130, s 109- 111 . doi: 10.18261/issn.1504-3096-2017-01-06
• Teigen, Karl Halvor (2017). A beginning bias in framing of season changes.
• Teigen, Karl Halvor (2017). En artikkel for alle årstider. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  54(5), s 472- 477
• Teigen, Karl Halvor (2017). Nobelpris til lirkemiddel-arkitekten. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  54, s 1071
• Hohle, Sigrid Møyner & Teigen, Karl Halvor (2016). The Trend Effect: People's perceptions of revised expert forecasts.
• Løhre, Erik & Teigen, Karl Halvor (2016). Stronger forecasts are more certain.
• Teigen, Karl Halvor (2016). Perception of chances – real and imaginary.
• Teigen, Karl Halvor (2016). The probable, the uncertain, and the hypothetical: Problems of assessment and communication.
• Hohle, Sigrid Møyner & Teigen, Karl Halvor (2015). Forecasting forecasts: The power of trends.
• Hohle, Sigrid Møyner & Teigen, Karl Halvor (2015). Trendeffekten: Hvordan tolkes reviderte klimaprognoser?.
• Kanten, Alf Børre & Teigen, Karl Halvor (2015). A Magnitude Effect in Judgments of Subjective Closeness.
• Løhre, Erik; Teigen, Karl Halvor & Hohle, Sigrid Møyner (2015). Trusting an uncertain forecaster: Judgments of revised intervals in predictions of climate change..
• Riege, Anine Cecilie & Teigen, Karl Halvor (2015). Everybody will win, and all must be hired:Comparing additivity neglect with the nonselective superiority bias.
• Teigen, Karl Halvor (2015). Om å varsle fremtiden: Hvordan vi forstår og misforstår prognoser.
• Teigen, Karl Halvor (2015). Th. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  52(9), s 774- 776
• Teigen, Karl Halvor (2015). What can happen? Spontaneous verbal probabilities describe extreme events.
• Teigen, Karl Halvor; Hohle, Sigrid Møyner & Løhre, Erik (2015). Trends in forecasts: When past predictions change present risks.
• Riege, Anine Cecilie; Sulutvedt, Unni; Bjørgfinsdottir, Røskva & Teigen, Karl Halvor (2014). An eye-tracking analysis of the effect of answering format on additivity neglect.
• Riege, Anine Cecilie & Teigen, Karl Halvor (2014). The relationship between additivity neglect and the nonselective superiority bias.
• Teigen, Karl Halvor (2014). Framing of uncertainty: Interval estimates and verbal probabilities.
• Teigen, Karl Halvor (2014). Historisk kognisjon - Kan sosial kognisjon bidra til å forstå lekfolks oppfatning av fortiden?.
• Teigen, Karl Halvor (2014). Hva er en psykolog?. Scandinavian Psychologist.  ISSN 1894-5570.
• Teigen, Karl Halvor (2014). Hva skal barnet hete? Kommentar til debatten om psykologiens “hypotetiske konstrukter”. Norsk Tidsskrift for Atferdsanalyse.  ISSN 0809-781X.  41(2), s 181- 184
• Teigen, Karl Halvor (2014). Hvordan kom fedrene seg hjem fra Eidsvoll. Psykologisk.no.
• Teigen, Karl Halvor (2014). Issues in communication of uncertainty.
• Teigen, Karl Halvor (2014). Luck, In Alex C. Michalos (ed.),  Encyclopedia of Quality of Life and Well-Being Research.  Springer.  ISBN 978-94-007-0752-8.  Oppslagsartikkel.  s 3731 - 3733
• Teigen, Karl Halvor (2014). Om avstand, risiko og stabburstrapper. Scandinavian Psychologist.  ISSN 1894-5570.
• Teigen, Karl Halvor (2014). Something old, something new: What makes an experience interesting.
• Teigen, Karl Halvor (2014). Verbal probabilities: A pragmatic perspective.
• Teigen, Karl Halvor & Nordbye, Gro Hege Haraldsen (2014). Is Carlsen more responsible than Anand? Responsibility judgments and outcome framing in the World Chess Championship. Vis sammendrag

  Lay people (students) and experts (chess players) were asked to predict the outcome of the World Chess Championship, which took place in India 9-20 November 2013 as a 10 rounds match between the reigning champion Vishy Anand and the Norwegian challenger Magnus Carlsen. Participants in seven samples also made causal responsibility judgments for four hypothetical outcomes, before, during, and (in hindsight) after the match. The winner was viewed as more responsible than the loser, especially for outcomes with large margins. An effect of focal player was also observed, with Carlsen perceived as more responsible for both losses and wins than Anand. However, when outcomes were framed as Anand’s (rather than Carlsen’s) wins and losses the effect was reduced or reversed, showing that responsibility judgments are affected by the way outcomes are framed.

• Filkukova, Petra & Teigen, Karl Halvor (2013). The effect of nutrition label format on perception of products.
• Nordbye, Gro Hege Haraldsen & Teigen, Karl Halvor (2013). Agency, Risk and Responsibility judgments.
• Riege, Anine Cecilie; Sulutvedt, Unni & Teigen, Karl Halvor (2013). Additivity neglect of probability estimates: An eye-tracking analysis.
• Teigen, Karl Halvor (2013). P?. Tidsskrift for Norsk Psykologforening.  ISSN 0332-6470.  50(1), s 34- 35
• Teigen, Karl Halvor & Juanchich, Marie (2013). Certain, possible, and improbable outcomes: A new approach to verbal probabilities.
• Nordbye, Gro Hege Haraldsen; Kirkebøen, Geir & Teigen, Karl Halvor (2012). Intuition and responsibility:Intuitive actors look less, but feel more, responsible.
• Nordbye, Gro Hege Haraldsen; Kirkebøen, Geir & Teigen, Karl Halvor (2012). Who is more responsible, the intuitive or the analytical decision maker?. Vis sammendrag

  People have tendency to prefer intuitively appealing rather than equally valid non-intuitive alternatives. One explanation is that intuitions spring to mind with ease, and people therefore hold them with confidence. We hypothesized that emotional consequences also may contribute to people’s tendency to go with their gut. In one scenario and one retrospective study, we found that emotional experiences of both positive and negative outcomes were intensified after choosing the intuitive versus the non-intuitive alternative. Our data indicate that these intensified emotions strengthen people’s experience of themselves as independent actors, and thereby, we speculate, may reinforce people’s tendency to follow their intuitions.

• Teigen, Karl Halvor (2012). "Du kunde ha varit där nu": kontrafaktisk tenkning i dagliglivet. Speilvendt.  ISSN 1893-4560.  (3), s 4- 7
• Teigen, Karl Halvor (2012). What is the difference between a happy and a lucky squirrel?Explorations in counterfactual closeness.
• Teigen, Karl Halvor & Filkukova, Petra (2012). Risk communication: Words vs. numbers.
• Teigen, Karl Halvor; Filkukova, Petra & Juanchich, Marie (2012). Possibilities are rare: A pragmatic approach to verbal probabilities.
• Filkukova, Petra & Teigen, Karl Halvor (2011). Can- vs. will-statements in the context of consumer communication.
• Kirkebøen, Geir; Nordbye, Gro Hege Haraldsen & Teigen, Karl Halvor (2011). Intuitive choices intensify emotional experiences:A reason for people’s tendency to go with their gut.
• Teigen, Karl Halvor (2011). Eksperiment og test, In Eivind Balsvik & Susanna Maria Solli (ed.),  Introduksjon til samfunnsvitenskapene; Bind 2.  Universitetsforlaget.  ISBN 978-82-15-01843-0.  Kapitel i Del III.  s 75 - 84
• Teigen, Karl Halvor (2011). Psykologi, I: Eivind Balsvik & Susanna Maria Solli (red.),  Introduksjon til samfunnsvitenskapene; Bind 2.  Universitetsforlaget.  ISBN 978-82-15-01843-0.  Kapitel i del 1.  s 162 - 177
• Teigen, Karl Halvor (2011). Skjønn og sannsynligheter: Glimt fra beslutningspsykologien.

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