Kjetil Sundet

• Vaskinn, Anja; Ueland, Torill; Melle, Ingrid & Sundet, Kjetil Søren (2024). Sex differences in social cognition among individuals with schizophrenia and in healthy control participants: a secondary analysis of published data. Archives of Women's Mental Health. ISSN 1434-1816. doi: 10.1007/s00737-024-01422-8.
• Haatveit, Beathe; Westlye, Lars Tjelta; Vaskinn, Anja; Flaaten, Camilla Bärthel; Mohn, Hanne Christine & Bjella, Thomas [Vis alle 12 forfattere av denne artikkelen] (2023). Intra- and inter-individual cognitive variability in schizophrenia and bipolar spectrum disorder: an investigation across multiple cognitive domains. Schizophrenia. 9(1). doi: 10.1038/s41537-023-00414-4. Fulltekst i vitenarkiv
• Vaskinn, Anja; Sundet, Kjetil Søren & Haatveit, Beathe (2022). Social cognitive heterogeneity in schizophrenia: A cluster analysis. Schizophrenia Research: Cognition. ISSN 2215-0013. 30. doi: 10.1016/j.scog.2022.100264. Fulltekst i vitenarkiv Vis sammendrag

  This study examined social cognitive heterogeneity in Norwegian sample of individuals with schizophrenia (n = 82). They were assessed with three social cognitive tests: Emotion in Biological Motion (emotion processing), Relationships Across Domains (social perception), and Movie for the Assessment of Social Cognition (theory of mind). Hierarchical and k-means cluster analyses using standardized scores on these three tests provided two clusters. The first cluster (68 %) had mild social cognitive impairments (2 standard deviations below healthy comparison participants). Validity of the two social cognitive subgroups was indicated by significant differences in functioning, symptom load and nonsocial cognition. Our study shows that social cognitive tests can be used for clinical and cognitive subtyping. This is of potential relevance for treatment.

• Vaskinn, Anja; Sundet, Kjetil; Melle, Ingrid; Andreassen, Ole A. & Friis, Svein (2021). The factor structure of social cognition in schizophrenia: Weak evidence for separable domains. Schizophrenia Research: Cognition. ISSN 2215-0013. 26, s. 1–4. doi: 10.1016/j.scog.2021.100208. Fulltekst i vitenarkiv Vis sammendrag

  This study examined the factor structure of social cognition in a Norwegian sample of individuals diagnosed with schizophrenia (n = 83). Eight variables from three social cognitive tests from three theoretical domains were included: emotion processing, social perception and theory of mind. Factor analysis with maximum likelihood extraction and oblique rotation resulted in two factors using Kaiser's criterion. Although the two-factor model had better fit than a unifactorial model, it did not represent the data well. Two social cognitive variables did not load on either factor. The two extracted factors did not correspond to an expected distinction between low and high level of processing or between affective and cognitive processes. A non-negligible number of nonredundant residuals between observed and computed correlations suggested poor model fit. In conclusion, this study failed to identify separable dimensions of social cognition in spite of including measures from different theoretical domains.

• Øie, Merete Glenne; Sundet, Kjetil Søren; Haug, Elisabeth; Zeiner, Pål; Klungsøyr, Ole & Rund, Bjørn Rishovd (2021). Cognitive Performance in Early-Onset Schizophrenia and Attention-Deficit/Hyperactivity Disorder: A 25-Year Follow-up Study . Frontiers in Psychology. ISSN 1664-1078. doi: 10.3389/fpsyg.2020.606365. Fulltekst i vitenarkiv Vis sammendrag

  Early-Onset Schizophrenia (EOS) and Attention Deficit-Hyperactivity Disorder (ADHD) are early- onset neurodevelopmental disorders associated with cognitive deficits. The current study represents the first attempt to compare these groups on a comprehensive cognitive test battery in a longitudinal design over 25 years in order to enhance our knowledge of particular patterns resulting from the interaction between normal maturational processes and different illness processes of these disorders. In the baseline study, 19 adolescents with schizophrenia were compared to 20 adolescents with ADHD and 30 healthy controls (HC), all between 12 and 18 years of age. After 13 years (T2) and after 25 years (T3) they were re-evaluated with the cognitive test battery. A cognitive Composite Score was used in a linear mixed model. The EOS group had a significant cognitive stagnation or deterioration from T1 to T2 compared to HC. However, the EOS group had the most positive change from T2 to T3, supporting a stable level of cognitive performance over the 25 year span. The ADHD group improved or had similar development as the HC group from T1 to T2. They continued to improve significantly compared to the HC group from T2 to T3. Individuals in the EOS group performed more impaired on the cognitive composite score compared to the HC group and the ADHD group at all three time points. Results might indicate a neurodevelopmental pathway of EOS with subnormal cognitive development specific in adolescence. In comparison, the ADHD group had a more consistent cognitive maturation supporting a maturational delay hypothesis of ADHD.

• Vaskinn, Anja; Haatveit, Beathe ; Melle, Ingrid; Andreassen, Ole Andreas; Ueland, Torill & Sundet, Kjetil Søren (2020). Cognitive Heterogeneity Across Schizophrenia and Bipolar Disorder: A Cluster Analysis of Intellectual Trajectories. Journal of the International Neuropsychological Society. ISSN 1355-6177. 26(9), s. 860–872. doi: 10.1017/S1355617720000442.
• Richards, Alexander L.; Pardiñas, Antonio F.; Frizzati, Aura; Tansey, Katherine E.; Lynham, Amy J. & Holmans, Peter [Vis alle 48 forfattere av denne artikkelen] (2019). The Relationship Between Polygenic Risk Scores and Cognition in Schizophrenia. Schizophrenia Bulletin. ISSN 0586-7614. doi: 10.1093/schbul/sbz061. Vis sammendrag

  BACKGROUND: Cognitive impairment is a clinically important feature of schizophrenia. Polygenic risk score (PRS) methods have demonstrated genetic overlap between schizophrenia, bipolar disorder (BD), major depressive disorder (MDD), educational attainment (EA), and IQ, but very few studies have examined associations between these PRS and cognitive phenotypes within schizophrenia cases. METHODS: We combined genetic and cognitive data in 3034 schizophrenia cases from 11 samples using the general intelligence factor g as the primary measure of cognition. We used linear regression to examine the association between cognition and PRS for EA, IQ, schizophrenia, BD, and MDD. The results were then meta-analyzed across all samples. A genome-wide association studies (GWAS) of cognition was conducted in schizophrenia cases. RESULTS: PRS for both population IQ (P = 4.39 x 10-28) and EA (P = 1.27 x 10-26) were positively correlated with cognition in those with schizophrenia. In contrast, there was no association between cognition in schizophrenia cases and PRS for schizophrenia (P = .39), BD (P = .51), or MDD (P = .49). No individual variant approached genome-wide significance in the GWAS. CONCLUSIONS: Cognition in schizophrenia cases is more strongly associated with PRS that index cognitive traits in the general population than PRS for neuropsychiatric disorders. This suggests the mechanisms of cognitive variation within schizophrenia are at least partly independent from those that predispose to schizophrenia diagnosis itself. Our findings indicate that this cognitive variation arises at least in part due to genetic factors shared with cognitive performance in populations and is not solely due to illness or treatment-related factors, although our findings are consistent with important contributions from these factors.

• Lam, Max; Hill, W. David; Trampush, Joey W.; Yu, Jin; Knowles, Emma & Davies, Gail [Vis alle 68 forfattere av denne artikkelen] (2019). Pleiotropic meta-analysis of cognition, education, and schizophrenia differentiates roles of early neurodevelopmental and adult synaptic pathways. American Journal of Human Genetics. ISSN 0002-9297. 105(2), s. 334–350. doi: 10.1016/j.ajhg.2019.06.012. Fulltekst i vitenarkiv
• Vaskinn, Anja; Løvgren, André; Egeland, Maj Kristoffersen; Feyer, Frida Karine; Østefjells, Tiril & Andreassen, Ole Andreas [Vis alle 8 forfattere av denne artikkelen] (2019). A randomized controlled trial of training of affect recognition (TAR) in schizophrenia shows lasting effects for theory of mind. European Archives of Psychiatry and Clinical Neuroscience. ISSN 0940-1334. 269(5), s. 611–620. doi: 10.1007/s00406-019-00997-z. Fulltekst i vitenarkiv
• Savage, Jeanne E.; Jansen, Philip R.; Stringer, Sven; Watanabe, Kyoko; Bryois, Julien & de Leeuw, Christiaan A. [Vis alle 117 forfattere av denne artikkelen] (2018). Genome-wide association meta-analysis in 269,867 individuals identifies new genetic and functional links to intelligence. Nature Genetics. ISSN 1061-4036. 50, s. 912–919. doi: 10.1038/s41588-018-0152-6.
• Vaskinn, Anja; Andersson, Stein; Østefjells, Tiril; Andreassen, Ole Andreas & Sundet, Kjetil Søren (2018). Emotion perception, non-social cognition and symptoms as predictors of theory of mind in schizophrenia. Comprehensive Psychiatry. ISSN 0010-440X. 85, s. 1–7. doi: 10.1016/j.comppsych.2018.05.002. Fulltekst i vitenarkiv
• Davies, Gail; Lam, Max; Harris, Sarah E.; Trampush, Joey W.; Luciano, Michelle & Hill, W. David [Vis alle 221 forfattere av denne artikkelen] (2018). Study of 300,486 individuals identifies 148 independent genetic loci influencing general cognitive function. Nature Communications. ISSN 2041-1723. 9(2098), s. 1–16. doi: 10.1038/s41467-018-04362-x. Fulltekst i vitenarkiv
• Bjørke-Bertheussen, Janette; Schøyen, Helle Kristine; Andreassen, Ole Andreas; Malt, Ulrik Fredrik; Ødegaard, Ketil Joachim & Morken, Gunnar [Vis alle 10 forfattere av denne artikkelen] (2017). Right unilateral electroconvulsive therapy does not cause more cognitive impairment than pharmacologic treatment in treatment-resistant bipolar depression: A 6-month randomized controlled trial follow-up study. Bipolar Disorders. ISSN 1398-5647. 20(6), s. 531–538. doi: 10.1111/bdi.12594.
• Lam, Max; Trampush, Joey W.; Yu, Jin; Knowles, Emma; Davies, Gail & Liewald, David C. [Vis alle 65 forfattere av denne artikkelen] (2017). Large-scale cognitive GWAS meta-analysis reveals tissue-specific neural expression and potential nootropic drug targets. Cell reports. ISSN 2211-1247. 21(9), s. 2597–2613. doi: 10.1016/j.celrep.2017.11.028.
• Engelstad, Katharina Nymo; Sundet, Kjetil Søren; Andreassen, Ole Andreas & Vaskinn, Anja (2017). Body language reading of emotion in schizophrenia: associations with symptoms and functional outcome. Scandinavian Journal of Psychology. ISSN 0036-5564. 58(5), s. 359–366. doi: 10.1111/sjop.12381.
• Vaskinn, Anja; Lagerberg, Trine Vik; Bjella, Thomas; Simonsen, Carmen Elisabeth; Andreassen, Ole Andreas & Ueland, Torill [Vis alle 7 forfattere av denne artikkelen] (2017). Impairment in emotion perception from body movements in individuals with bipolar I and bipolar II disorder is associated with functional capacity. International journal of bipolar disorders. ISSN 2194-7511. 5(13), s. 1–9. doi: 10.1186/s40345-017-0083-7. Fulltekst i vitenarkiv
• Simonsen, Carmen Elisabeth; Færden, Ann; Romm, Kristin Lie; Berg, Akiah Ottesen; Bjella, Thomas & Sundet, Kjetil Søren [Vis alle 9 forfattere av denne artikkelen] (2017). Early clinical recovery in first-episode psychosis: Symptomatic remission and its correlates at 1-year follow-up. Psychiatry Research. ISSN 0165-1781. 254, s. 118–125. doi: 10.1016/j.psychres.2017.04.050.
• Trampush, Joey W.; Yang, M.L.Z.; Yu, Jin; Knowles, Emma; Davies, Gail & Liewald, David C.M. [Vis alle 66 forfattere av denne artikkelen] (2017). GWAS meta-analysis reveals novel loci and genetic correlates for general cognitive function: a report form the COGENT consortium. Molecular Psychiatry. ISSN 1359-4184. 22(3), s. 336–345. doi: 10.1038/mp.2016.244. Fulltekst i vitenarkiv
• Athanasiu, Lavinia; Giddaluru, Sudheer; Neto, Carla Patricia Duarte Fernande; Christoforou, Andrea; Reinvang, Ivar & Lundervold, Astri [Vis alle 17 forfattere av denne artikkelen] (2017). A genetic association study of CSMD1 and CSMD2 with cognitive function. Brain, Behavior, and Immunity. ISSN 0889-1591. 61, s. 209–216. doi: 10.1016/j.bbi.2016.11.026.
• Berg, Akiah Ottesen; Melle, Ingrid; Zuber, Verena; Simonsen, Carmen Elisabeth; Nerhus, Mari & Ueland, Torill [Vis alle 9 forfattere av denne artikkelen] (2017). Modelling difficulties in abstract thinking in psychosis: the importance of socio-developmental background. Cognitive Neuropsychiatry. ISSN 1354-6805. 22(1), s. 39–52. doi: 10.1080/13546805.2016.1259998.
• Gunnarsson, Bjarni; Jonsdottir, Gudrun A; Bjornsdottir, Gyda; Konte, Bettina; Sulem, Patrick & Kristmundsdottir, Snædis [Vis alle 31 forfattere av denne artikkelen] (2016). A sequence variant associating with educational attainment also affects childhood cognition. Scientific Reports. ISSN 2045-2322. 6. doi: 10.1038/srep36189.
• Vaskinn, Anja; Sundet, Kjetil Søren; Østefjells, Tiril; Nymo, Katharina Sørvang; Melle, Ingrid & Ueland, Torill (2016). Reading emotions from body movement: A generalized impairment in schizophrenia. Frontiers in Psychology. ISSN 1664-1078. 6. doi: 10.3389/fpsyg.2015.02058. Fulltekst i vitenarkiv
• Howrigan, Dave; Simonson, M.A.; Davies, Gail; Harris, SE; Tenesa, A. & Starr, JM [Vis alle 47 forfattere av denne artikkelen] (2016). Genome-wide autozygosity is associated with lower general cognitive ability. Molecular Psychiatry. ISSN 1359-4184. 21(6), s. 837–843. doi: 10.1038/mp.2015.120.
• Rund, Bjørn Rishovd; Barder, Helene; Evensen, Julie Horgen; Haahr, Ulrik; Hegelstad, Wenche & Joa, Inge [Vis alle 17 forfattere av denne artikkelen] (2016). Neurocognition and Duration of Psychosis: A 10-year Follow-up of First-Episode Patients. Schizophrenia Bulletin. ISSN 0586-7614. 42(1), s. 87–95. doi: 10.1093/schbul/sbv083.
• Haatveit, Beathe Christin; Vaskinn, Anja; Sundet, Kjetil Søren; Jensen, Jimmy Kristian; Andreassen, Ole Andreas & Melle, Ingrid [Vis alle 7 forfattere av denne artikkelen] (2015). Stability of executive functions in first episode psychosis: One year follow up study. Psychiatry Research. ISSN 0165-1781. 228(3), s. 475–481. doi: 10.1016/j.psychres.2015.05.060.
• Vaskinn, Anja; Antonsen, Bjørnar Torske; Fretland, Ragnhild Avdem; Dziobek, Isabel; Sundet, Kjetil Søren & Wilberg, Theresa (2015). Theory of mind in women with borderline personality disorder or schizophrenia: differences in overall ability and error patterns. Frontiers in Psychology. ISSN 1664-1078. doi: 10.3389/fpsyg.2015.01239. Fulltekst i vitenarkiv
• Trampush, Joey W.; Lencz, Todd; Knowles, Emma; Davies, Gail; Guha, Saurav & Pe'er, Itsik [Vis alle 53 forfattere av denne artikkelen] (2015). Independent evidence for an association between general cognitive ability and a genetic locus for educational attainment. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics. ISSN 1552-4841. 168(5), s. 363–373. doi: 10.1002/ajmg.b.32319.
• Vaskinn, Anja; Ventura, Joseph; Andreassen, Ole Andreas; Melle, Ingrid & Sundet, Kjetil Søren (2015). A social path to functioning in schizophrenia: from social self-efficacy through negative symptoms to social functional capacity. Psychiatry Research. ISSN 0165-1781. 228(3), s. 803–807. doi: 10.1016/j.psychres.2015.05.019.
• Dybedal, Gro Strømnes; Tanum, Lars; Sundet, Kjetil Søren & Bjølseth, Tor Magne (2015). The role of baseline cognitive function in the neurocognitive effects of electroconvulsive therapy in depressed elderly patients. The Clinical Neuropsychologist. ISSN 1385-4046. 29(4), s. 487–508. doi: 10.1080/13854046.2015.1050457.
• Fretland, Ragnhild Avdem; Andersson, Stein; Sundet, Kjetil Søren; Andreassen, Ole Andreas; Melle, Ingrid & Vaskinn, Anja (2015). Theory of mind in schizophrenia: Error types and associations with symptoms. Schizophrenia Research. ISSN 0920-9964. 162(1-3), s. 42–46. doi: 10.1016/j.schres.2015.01.024.
• Vaskinn, Anja; Hartberg, Cecilie Bhandari; Sundet, Kjetil Søren; Westlye, Lars Tjelta; Andreassen, Ole Andreas & Melle, Ingrid [Vis alle 7 forfattere av denne artikkelen] (2015). Brain structure characteristics in intellectually superior schizophrenia. Psychiatry Research : Neuroimaging. ISSN 0925-4927. 232(1), s. 123–129. doi: 10.1016/j.pscychresns.2015.02.005.
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Evensen, Julie Horgen; Haahr, Ulrik & Hegelstad, Wenche [Vis alle 17 forfattere av denne artikkelen] (2015). Ten year course of IQ in first-episode psychosis: relationship between duration of psychsis and long-term intellectual trajectories. Psychiatry Research. ISSN 0165-1781. 225(3), s. 515–521. doi: 10.1016/j.psychres.2014.11.054.
• Mohn, Christine; Sundet, Kjetil Søren & Rund, Bjørn Rishovd (2014). The relationship between IQ and performance on the MATRICS Consensus Cognitive Battery. Schizophrenia Research: Cognition. ISSN 2215-0013. 1, s. 96–100. doi: 10.1016/j.scog.2014.06.003.
• Kessler, Ute; Schøyen, Helle Kristine; Andreassen, Ole Andreas; Eide, Geir Egil; Malt, Ulrik Fredrik & Ødegaard, Kjetil [Vis alle 9 forfattere av denne artikkelen] (2014). The effect of electroconvulsive therapy on neurocognitive function in treatment-resistant bipolar disorder depression. Journal of Clinical Psychiatry. ISSN 0160-6689. 75(11), s. e1306–e1313. doi: 10.4088/JCP.13m08960.
• Ramtvedt, Bjørn Erik & Sundet, Kjetil Søren (2014). Relationship between computer-based testing and behavioral ratings in the assessment of attention and activity in a pediatric ADHD stimulant crossover trial. The Clinical Neuropsychologist. ISSN 1385-4046. 28(7), s. 1146–1161. doi: 10.1080/13854046.2014.960453.
• Dybedal, Gro Strømnes; Tanum, Lars; Sundet, Kjetil Søren; Gaarden, Torfinn & Bjølseth, Tor Magne (2014). Cognitive side-effects of electroconvulsive therapy in elderly depressed patients. The Clinical Neuropsychologist. ISSN 1385-4046. 28(7), s. 1071–1090. doi: 10.1080/13854046.2014.958536. Vis sammendrag

  Knowledge about cognitive side-effects induced by electroconvulsive therapy (ECT) in depressed elderly patients is sparse. In this study we investigated changes in the cognitive functioning of non-demented elderly depressed patients receiving ECT (n = 62) compared with healthy elderly people (n = 17). Neuropsychological tests were administered at the start of treatment and again within 1 week after treatment. We computed reliable change indices (RCIs) using simple regression methods. RCIs are statistical methods for analyzing change in individuals that have not yet been used in studies of the acute cognitive side-effects of ECT. At the group level, only letter fluency performance was found to be significantly reduced in the ECT group compared with the controls, whereas both groups demonstrated stable or improved performance on all other measures. At the individual level, however, 11% of patients showed retrograde amnesia for public facts post-ECT and 40% of the patients showed a significant decline in neuropsychological functioning. Decline on a measure of delayed verbal anterograde memory was most common. Our findings indicate that there are mild neurocognitive impairments in the acute phase for a substantial minority of elderly patients receiving ECT. Analysis of reliable change facilitated the illumination of cognitive side-effects in our sample.

• Ramtvedt, Bjørn Erik; Sandvik, Leiv & Sundet, Kjetil Søren (2014). Correspondence between children's and adult's ratings of stimulant-induced changes in ADHD behaviours in a crossover trial with medication-naive children. European Journal of Developmental Psychology. ISSN 1740-5629. 11(6), s. 687–700. doi: 10.1080/17405629.2014.927760.
• Vaskinn, Anja; Ueland, Toril; Melle, Ingrid; Agartz, Ingrid; Andreassen, Ole Andreas & Sundet, Kjetil Søren (2014). Neurocognitive decrements are present in intellectually superior schizophrenia. Frontiers in Psychiatry. ISSN 1664-0640. 5(MAY). doi: 10.3389/fpsyt.2014.00045. Fulltekst i vitenarkiv
• Ramtvedt, Bjørn Erik; Aabech, Henning & Sundet, Kjetil Søren (2014). Minimizing adverse events while maintaining clinical improvement in a pediatric attention-deficit/hyperactivity disorder crossover trial with dextroamphetamine and methylphenidate. Journal of child and adolescent psychopharmacology. ISSN 1044-5463. 24(3), s. 130–139. doi: 10.1089/cap.2013.0114.
• Lencz, T; Knowles, Emily; Davies, G; Guha, S; Liewald, DC & Starr, JM [Vis alle 46 forfattere av denne artikkelen] (2014). Molecular genetic evidence for overlap between general cognitive ability and risk for schizophrenia: A report from the Cognitive Genomics consorTium (COGENT). Molecular Psychiatry. ISSN 1359-4184. 19(2), s. 168–174. doi: 10.1038/mp.2013.166. Fulltekst i vitenarkiv
• Brandt, Christine Lycke; Eichele, Tom; Melle, Ingrid; Sundet, Kjetil Søren; SERVER, ANDRES & Agartz, Ingrid [Vis alle 9 forfattere av denne artikkelen] (2014). Working memory networks and activation patterns in schizophrenia and bipolar disorder: comparison with healthy controls. British Journal of Psychiatry. ISSN 0007-1250. 204(4), s. 290–298. doi: 10.1192/bjp.bp.113.129254.
• Hellvin, Tone; Sundet, Kjetil Søren; Aminoff, Sofie Ragnhild; Andreassen, Ole Andreas & Melle, Ingrid (2013). Social functioning in firste contact mania: clinical and neurocognitive correlates. Comprehensive Psychiatry. ISSN 0010-440X. 54(5), s. 432–438. doi: 10.1016/j.comppsych.2012.12.016.
• Ringen, Petter Andreas; Melle, Ingrid; Berg, Akiah Ottesen; Agartz, Ingrid; Spigset, Olav & Simonsen, Carmen Elisabeth [Vis alle 8 forfattere av denne artikkelen] (2013). Cannabis use and premorbid functioning as predictors of poorer neurocognition in schizophrenia spectrum disorder. Schizophrenia Research. ISSN 0920-9964. 143(1), s. 84–89. doi: 10.1016/j.schres.2012.10.021.
• Peleikis, Dawn Elisabeth; Varga, Monica; Sundet, Kjetil Søren; Lorentzen, Steinar; Agartz, Ingrid & Andreassen, Ole Andreas (2013). Schizophrenia patients with and without Post-traumatic Stress Disorder (PTSD) have different mood symptom levels but same cognitive functioning. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 127(6), s. 455–463. doi: 10.1111/acps.12041.
• Tandberg, Marte; Sundet, Kjetil Søren; Andreassen, Ole Andreas; Melle, Ingrid & Ueland, Toril (2013). Occupational functioning, symptoms and neurocognition in patients with psychotic disorders: investigating subgroups based on social security status. Social Psychiatry and Psychiatric Epidemiology. ISSN 0933-7954. 48(6), s. 863–874. doi: 10.1007/s00127-012-0598-2.
• Jónsdóttir, Halldóra; Ilner, Stein E. Opjordsmoen; Birkenæs, Astrid Brate; Simonsen, Carmen Elisabeth; Engh, John & Ringen, Petter Andreas [Vis alle 10 forfattere av denne artikkelen] (2013). Predictors of medication adherence in patients with schizophrenia and bipolar disorder. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 127(1), s. 23–33. doi: 10.1111/j.1600-0447.2012.01911.x.
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Evensen, Julie Horgen; Haahr, Ulrik & Hegelstad, Wenche [Vis alle 17 forfattere av denne artikkelen] (2013). Ten year neurocognitive trajectories in first-episode psychosis. Frontiers in Human Neuroscience. ISSN 1662-5161. 7. doi: 10.3389/fnhum.2013.00643. Fulltekst i vitenarkiv
• Mohn, Christine; Sundet, Kjetil Søren & Rund, Bjørn Rishovd (2013). Standardisering av MATRICS Consensus Cognitive Battery (MCCB) for bruk i Norge. Tidsskrift for Norsk Psykologforening. ISSN 0332-6470. 50, s. 989–991.
• Aas, Monica; Haukvik, Unn Kristin H.; Djurovic, Srdjan; Bergmann, Ørjan; Athanasiu, Lavinia & Tesli, Martin Steen [Vis alle 13 forfattere av denne artikkelen] (2013). BDNF val66met modulates the association between childhood trauma, cognitive and brain abnormalities in psychoses. Progress in Neuro-psychopharmacology and Biological Psychiatry. ISSN 0278-5846. 46, s. 181–188. doi: 10.1016/j.pnpbp.2013.07.008.
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Evensen, Julie Horgen; Haahr, Ulrik & Hegelstad, Wenche [Vis alle 17 forfattere av denne artikkelen] (2013). Neurocognitive development in first episode psychosis 5 years follow-up: associations between illness severity and cognitive course. Schizophrenia Research. ISSN 0920-9964. 149(1-3), s. 63–69. doi: 10.1016/j.schres.2013.06.016. Vis sammendrag

  Cognitive deficits are documented in first-episode psychosis (FEP), but the continuing course is not fully understood. The present study examines the longitudinal development of neurocognitive function in a five year follow-up of FEP-patients, focusing on the relation to illness severity, as measured by relapses and diagnostic subgroups. The study is an extension of previous findings from the TIPS-project, reporting stability over the first two years. Sixty-two FEP patients (53% male, age 28 ± 9 years) were neuropsychologically examined at baseline and at 1, 2, and 5 year follow-ups. The test battery was divided into five indices; Verbal Learning, Executive Function, Impulsivity, Motor Speed, and Working Memory. To investigate the effect of illness severity, the sample was divided in groups based on number of relapses, and diagnostic subgroups, respectively. Impulsivity and Working Memory improved significantly in the first two years, followed by no change over the next three years. Motor Speed decreased significantly from 2 to 5 years. Number of relapses was significantly related to Verbal Learning and Working Memory, showing a small decrease and less improvement, respectively, in patients with two or more episodes. No significant association was found with diagnostic group. Neurocognitive stability as well as change was found in a sample of FEP-patients examined repeatedly over 5 years. Of potential greater importance for understanding how psychotic illnesses progress, is the finding of significant associations between neurocognition and number of relapses but not diagnostic group, indicating that neurocognition is more related to recurring psychotic episodes than to the descriptive diagnosis per se.

• Dybedal, Gro Strømnes; Tanum, Lars; Sundet, Kjetil Søren; Gaarden, Torfinn Lødøen & Bjølseth, Tor Magne (2013). Neuropsychological functioning in late-life depression. Frontiers in Psychology. ISSN 1664-1078. 4(381). doi: 10.3389/fpsyg.2013.00381. Fulltekst i vitenarkiv
• Vaskinn, Anja; Sundet, Kjetil Søren; Ueland, Toril; Agartz, Ingrid; Melle, Ingrid & Andreassen, Ole Andreas (2013). Social cognition and clinical insight in schizophrenia and bipolar disorder. Journal of Nervous and Mental Disease. ISSN 0022-3018. 201(6), s. 445–451. doi: 10.1097/NMD.0b013e31829480c8.
• Ramtvedt, Bjørn Erik; Røinås, Elisabeth; Aabech, Henning & Sundet, Kjetil Søren (2013). Clinical gains from including both dextroamphetamine and methylphenidate in stimulant trials. Journal of child and adolescent psychopharmacology. ISSN 1044-5463. 23(9), s. 597–604. doi: 10.1089/cap.2012.0085.
• Bourne, Corin; Aydemir, Ömer; Balanzá-Maríinez, Vicent; Bora, Emre; Brissos, Sofia & Cavanagh, Jonathan T.O. [Vis alle 43 forfattere av denne artikkelen] (2013). Neuropsychological testing of cognitive impairment in euthymic bipolar disorder: an individual patient data meta-analysis. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 128(3), s. 149–162. doi: 10.1111/acps.12133.
• Kessler, Ute; Schøyen, Helle Kristine; Andreassen, Ole Andreas; Eide, Geir Egil; Hammar, Åsa & Malt, Ulrik Fredrik [Vis alle 10 forfattere av denne artikkelen] (2013). Neurocognitive profiles in treatment-resistant bipolar I and bipolar II disorder depression. BMC Psychiatry. ISSN 1471-244X. 13. doi: 10.1186/1471-244X-13-105. Fulltekst i vitenarkiv
• Schøyen, Helle Kristine; Melle, Ingrid; Sundet, Kjetil Søren; Aminoff, Sofie Ragnhild; Hellvin, Tone & Auestad, Bjørn Henrik [Vis alle 8 forfattere av denne artikkelen] (2013). Occupational outcome in bipolar disorder is not predicted by premorbid functioning and intelligence. Bipolar Disorders. ISSN 1398-5647. 15(3), s. 294–305. doi: 10.1111/bdi.12056.
• Malt, Ulrik Fredrik; Andersson, Stein & Sundet, Kjetil Søren (2012). Supplerende ikke-biologiske undersøkelsesmetoder. I Andreassen, Ole Andreas (Red.), Lærebok i psykiatri. Gyldendal Akademisk. ISSN 978-82-05-39739-2. s. 173–193.
• Holmen, Aina; Juuhl-Langseth, Monica; Thormodsen, Rune; Ueland, Toril; Agartz, Ingrid & Sundet, Kjetil Søren [Vis alle 9 forfattere av denne artikkelen] (2012). Executive function in early- and adult onset schizophrenia. Schizophrenia Research. ISSN 0920-9964. 142(1-3), s. 177–182. doi: 10.1016/j.schres.2012.10.006.
• Sundet, Kjetil Søren & Reinvang, Ivar (2012). Nevropsykologisk undersøkelse ved alvorlige sinnslidelser: metodikk og funn. I Fladby, Tormod; Andersson, Stein & Gjerstad, Leif (Red.), Nevropsykiatri : metoder og kliniske perspektiver. Gyldendal Akademisk. ISSN 9788205412149. s. 111–115.
• Wirgenes, Katrine Verena; Sønderby, Ida Elken; Haukvik, Unn Kristin H.; Mattingsdal, Morten; Tesli, Martin Steen & Athanasiu, Lavinia [Vis alle 14 forfattere av denne artikkelen] (2012). TCF4 sequence variants and mRNA levels are associated with neurodevelopmental characteristics in psychotic disorders. Translational Psychiatry. ISSN 2158-3188. 2(e112). doi: 10.1038/tp.2012.39.
• Halvorsen, Marianne; Høifødt, Ragnhild Sørensen; Myrbakk, Ingvild Nordnes; Wang, Catharina E.; Sundet, Kjetil Søren & Eisemann, Martin [Vis alle 7 forfattere av denne artikkelen] (2012). Cognitive function in unipolar major depression: A comparison of currently depressed, previously depressed, and never depressed individuals. Journal of Clinical and Experimental Neuropsychology. ISSN 1380-3395. 34(7), s. 782–790. doi: 10.1080/13803395.2012.683853.
• Hellvin, Tone; Sundet, Kjetil Søren; Simonsen, Carmen Elisabeth; Aminoff, Sofie Ragnhild; Lagerberg, Trine Vik & Andreassen, Ole Andreas [Vis alle 7 forfattere av denne artikkelen] (2012). Neurocognitive functioning in patients recently diagnosed with bipolar disorder. Bipolar Disorders. ISSN 1398-5647. 14(3), s. 227–238. doi: 10.1111/j.1399-5618.2012.01004.x.
• Evensen, Julie Horgen; Røssberg, Jan Ivar; Barder, Helene; Haahr, Ulrik; Hegelstad, Wenche & Joa, Inge [Vis alle 16 forfattere av denne artikkelen] (2012). Apathy in first episode psychosis patients: A ten year longitudinal follow-up study. Schizophrenia Research. ISSN 0920-9964. 136(1-3), s. 19–24. doi: 10.1016/j.schres.2011.12.019.
• Aas, Monica; Steen, Nils Eiel; Agartz, Ingrid; Aminoff, Sofie Ragnhild; Lorentzen, Steinar & Sundet, Kjetil Søren [Vis alle 8 forfattere av denne artikkelen] (2012). Is cognitive impairment following early life stress in severe mental disorders based on specific or general cognitive functioning? Psychiatry Research. ISSN 0165-1781. 198(3), s. 495–500. doi: 10.1016/j.psychres.2011.12.045.
• Mohn, Christine; Sundet, Kjetil Søren & Rund, Bjørn Rishovd (2012). The Norwegian standardization of the MATRICS (Measurement and Treatment Research to Improve Cognition in Schizophrenia) Consensus Cognitive Battery. Journal of Clinical and Experimental Neuropsychology. ISSN 1380-3395. 34(6), s. 667–677. doi: 10.1080/13803395.2012.667792.
• Hegelstad, Wenche; Larsen, Tor Kjetil; Auestad, Bjørn Henrik; Evensen, Julie Horgen; Haahr, Ulrik & Joa, Inge [Vis alle 17 forfattere av denne artikkelen] (2012). Long-Term Follow-Up of the TIPS Early Detection in Psychosis Study: Effects on 10-Year Outcome. American Journal of Psychiatry. ISSN 0002-953X. 169(4), s. 374–380. doi: 10.1176/appi.ajp.2011.11030459.
• Holmen, Aina; Juuhl-Langseth, Monica; Thormodsen, Rune; Sundet, Kjetil Søren; Melle, Ingrid & Rund, Bjørn Rishovd (2012). Executive function tests in early-onset psychosis: which one to choose? Scandinavian Journal of Psychology. ISSN 0036-5564. 53(3), s. 200–205. doi: 10.1111/j.1467-9450.2012.00940.x.
• Aminoff, Sofie Ragnhild; Jensen, Jimmy Kristian; Lagerberg, Trine Vik; Hellvin, Tone; Sundet, Kjetil Søren & Andreassen, Ole Andreas [Vis alle 7 forfattere av denne artikkelen] (2012). An association between affective lability and executive functioning in bipolar disorder. Psychiatry Research. ISSN 0165-1781. 198(1), s. 58–61. doi: 10.1016/j.psychres.2011.12.044.
• Andreassen, Ole Andreas & Sundet, Kjetil Søren (2012). Kognitive funksjoner ved bipolare lidelser. I Haver, Brit; Ødegaard, Ketil Joachim & Fasmer, Ole Bernt (Red.), Bipolare lidelser. Fagbokforlaget. ISSN 978-82-450-0585-1. s. 253–264.
• Tandberg, Marte; Ueland, Torill; Andreassen, Ole Andreas; Sundet, Kjetil Søren & Melle, Ingrid (2012). Factors associated with occupational and academic status in patients with first-episode psychosis with a particular focus on neurocognition. Social Psychiatry and Psychiatric Epidemiology. ISSN 0933-7954. 47(11), s. 1763–1773. doi: 10.1007/s00127-012-0477-x.
• Aas, Monica; Djurovic, Srdjan; Athanasiu, Lavinia; Steen, Nils Eiel; Agartz, Ingrid & Lorentzen, Steinar [Vis alle 9 forfattere av denne artikkelen] (2012). Serotonin Transporter Gene Polymorphism, Childhood Trauma, and Cognition in Patients With Psychotic Disorders. Schizophrenia Bulletin. ISSN 0586-7614. 38(1), s. 15–22. doi: 10.1093/schbul/sbr113.
• LeBlanc, Marissa; Kulle, Bettina; Sundet, Kjetil Søren; Agartz, Ingrid; Melle, Ingrid & Djurovic, Srdjan [Vis alle 8 forfattere av denne artikkelen] (2012). Genome-wide study identifies PTPRO and WDR72 and FOXQ1-SUMO1P1 interaction associated with neurocognitive function. Journal of Psychiatric Research. ISSN 0022-3956. 46(2), s. 271–278. doi: 10.1016/j.jpsychires.2011.11.001.
• Hrubos-Strøm, Harald; Nordhus, Inger Hilde; Einvik, Gunnar; Randby, Anna; Omland, Torbjørn & Sundet, Kjetil Søren [Vis alle 8 forfattere av denne artikkelen] (2012). Obstructive sleep apnea, verbal memory, and executive function in a community-based high-risk population identified by the Berlin Questionnaire Akershus Sleep Apnea Project. Sleep and Breathing. ISSN 1520-9512. 16(1), s. 223–231. doi: 10.1007/s11325-011-0493-1.
• Sundet, Kjetil Søren (2011). Nevropsykologisk funksjonssvikt ved schizofreni. I Rund, Bjørn Rishovd (Red.), Schizofreni. Hertervig Akademisk. ISSN 9788282170222. s. 102–117.
• Hartberg, Cecilie Bhandari; Sundet, Kjetil Søren; Rimol, Lars Morten; Haukvik, Unn Kristin H.; Lange, Elisabeth & Nesvåg, Ragnar [Vis alle 10 forfattere av denne artikkelen] (2011). Brain Cortical Thickness and Surface Area Correlates of Neurocognitive Performance in Patients with Schizophrenia, Bipolar Disorder, and Healthy Adults. Journal of the International Neuropsychological Society. ISSN 1355-6177. 17(6), s. 1080–1093. doi: 10.1017/S1355617711001081.
• Bakken, Trygve E.; Bloss, Cinnamon S.; Roddey, Cooper; Joyner, Alexander H.; Rimol, Lars Morten & Djurovic, Srdjan [Vis alle 12 forfattere av denne artikkelen] (2011). Association of genetic variants on 15q12 with cortical thickness and cognition in schizophrenia. Archives of General Psychiatry. ISSN 0003-990X. 68(8), s. 781–790. doi: 10.1001/archgenpsychiatry.2011.81.
• Tandberg, Marte; Ueland, Toril; Sundet, Kjetil Søren; Haahr, Ulrik; Joa, Inge & Johannessen, Jan Olav [Vis alle 15 forfattere av denne artikkelen] (2011). Neurocognition and occupational functioning in patients with first-episode psychosis: a 2-year follow-up study. Psychiatry Research. ISSN 0165-1781. 188(3), s. 334–342. doi: 10.1016/j.psychres.2011.04.021.

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• Davies, Gail; Lam, Max; Harris, Sarah E.; Trampush, Joey W.; Luciano, Michelle & Hill, W. David [Vis alle 222 forfattere av denne artikkelen] (2019). Author Correction: Study of 300,486 individuals identifies 148 independent genetic loci influencing general cognitive function (Nature Communications, (2018), 9, 1, (2098), 10.1038/s41467-018-04362-x). Nature Communications. ISSN 2041-1723. 10(1). doi: 10.1038/s41467-019-10160-w.
• Lam, Max; Trampush, Joey W.; Yu, Jin; Knowles, Emma; Djurovic, Srdjan & Melle, Ingrid [Vis alle 61 forfattere av denne artikkelen] (2018). Multi-Trait analysis of gwas and biological insights into cognition: A response to Hill (2018). Twin Research and Human Genetics. ISSN 1832-4274. 21(5), s. 394–397. doi: 10.1017/thg.2018.46.
• Sundet, Kjetil Søren; Grüner, Renate; Larøi, Frank & Rönnberg, Jerker (2018). Brain, mind and behavior: a tribute to Kenneth Hugdahl. Scandinavian Journal of Psychology. ISSN 0036-5564. 59(1), s. 1–2. doi: 10.1111/SJOP.12423.
• Sundet, Kjetil Søren (2017). Eksekutiv funksjonssvikt ved schizofreni. BestPractice Psykiatri/Nevrologi/Geriatri. 8(32).
• Vaskinn, Anja; Hartberg, Cecilie Bhandari; Sundet, Kjetil Søren; Westlye, Lars Tjelta; Andreassen, Ole Andreas & Melle, Ingrid [Vis alle 7 forfattere av denne artikkelen] (2015). To the editors: Reply to Anna R. Docherty. Psychiatry Research. ISSN 0165-1781. doi: 10.1016/j.pscychresns.2015.07.022..
• Aas, Monica; Djurovic, Srdjan; Sundet, Kjetil Søren; Andreassen, Ole Andreas & Melle, Ingrid (2014). Is physical exercise associated with increased BDNF mRNA and improved cognition in patients with psychoses.
• Aas, Monica; Djurovic, Srdjan; Sundet, Kjetil Søren; Andreassen, Ole A. & Melle, Ingrid (2014). Is physical exercise associated with increased BDNF mRNA and improved cognition in patients with psychoses?
• Dybedal, Gro Strømnes; Tanum, Lars; Sundet, Kjetil Søren; Gaarden, Torfinn & Bjølseth, Tor Magne (2014). Kognitive bivirkninger av elektrokonvulsiv behandling (ECT) ved depresjon.
• Lundervold, Astri ; Walhovd, Kristine B; Rönnberg, Jerker & Sundet, Kjetil Søren (2014). New perspectives in neuropsychology. Scandinavian Journal of Psychology. ISSN 0036-5564. 55(3), s. 187–188. doi: 10.1111/sjop.12135.
• Sundet, Kjetil Søren (2013). Æresmedlem: Ivar Reinvang. Nevropsykologi : Medlemsblad for Norsk Nevropsykologisk Forening. ISSN 1500-8347. 16, s. 4–5.
• Aas, Monica; Djurovic, Srdjan; Athanasiu, Lavinia; Tesli, Martin Steen; Hellvin, Tone & Steen, Nils Eiel [Vis alle 11 forfattere av denne artikkelen] (2012). Interaction between (BDNF) VAL66Met, childhood adverse events and impaired cognition in patients with schizophrenia spectrum and bipolar disorder. Early Intervention in Psychiatry. ISSN 1751-7885. 6, s. 45–45.
• Friis, Svein; Barder, Helene; Evensen, Julie Horgen; Haahr, Ulrik; Hegelstad, Wenche ten Velden & Joa, Inge [Vis alle 17 forfattere av denne artikkelen] (2012). The TIPS study and bias: Replies to Dr Amos. Australian and New Zealand journal of psychiatry (Print). ISSN 0004-8674. 46(9), s. 905–907. doi: 10.1177/0004867412451344.
• Kessler, Ute; Schøyen, Helle Kristine; Andreassen, Ole Andreas; Bergsholm, Per; Eide, Geir Egil & Hammar, Åsa [Vis alle 11 forfattere av denne artikkelen] (2012). The neurocognitive profile in depressed therapy resistant bipolar disorder inpatients. Bipolar Disorders. ISSN 1398-5647. 14, s. 91–91.
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Haar, Ulrik; Johannessen, Jan Olav & Larsen, Tor Ketil [Vis alle 12 forfattere av denne artikkelen] (2012). Neurocognitive development in first-episode psychosis 5-year follow-up: associations between illness severity and cognitive course. Early Intervention in Psychiatry. ISSN 1751-7885. 6, s. 27–27.
• Halvorsen, Marianne; Høifødt, Ragnhild Sørensen; Myrbakk, Ingvild Nordnes; Wang, Catharina E.; Sundet, Kjetil Søren & Eisemann, Martin [Vis alle 7 forfattere av denne artikkelen] (2011). Cognitive function in unipolar major depression: A comparison of clinically depressed, previously depressed and never depressed individuals.
• Tandberg, Marte; Ueland, Toril; Sundet, Kjetil Søren; Melle, Ingrid; Røssberg, Jan Ivar & Joa, Inge [Vis alle 15 forfattere av denne artikkelen] (2011). NEUROCOGNITION AND OCCUPATIONAL FUNCTIONING IN PATIENTS WITH FIRST EPISODE PSYCHOSIS: A 2-YEAR FOLLOW-UP STUDY. Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 254–254.
• Friis, Svein; Evensen, Julie Horgen; Haahr, Ulrik; Hegelstad, Wenche; Joa, Inge & Johannessen, O [Vis alle 16 forfattere av denne artikkelen] (2011). Early Detection and Intervention(EDI) in first episode psychosis: Can it reduce the risk for poor outcome? Tips 10 years findings. Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 98–98.
• McGlashan, Thomas H.; Evensen, Julie Horgen; Haahr, J.; Hegelstad, Wenche; Joa, Inge & Johannessen, Jan Olav [Vis alle 16 forfattere av denne artikkelen] (2011). EARLY DETECTION AND INTERVENTION (EDI) IN FIRST EPISODE PSYCHOSIS: CAN IT IN CREASE THE CHANCE FOR FULL RECOVERY? TIPS 10 YEAR FINDINGS. Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 273–274.
• Vaskinn, Anja; Simonsen, Carmen Elisabeth; Hellvin, Tone; Melle, Ingrid; Andreassen, Ole Andreas & Sundet, Kjetil Søren (2011). SEX DIFFERENCES IN NEUROCOGNITIVE PERFORMANCE ACROSS PSYCHOTIC DISORDERS. Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 255–255.
• Ringen, Petter Andreas; Melle, Ingrid; Berg, Akiah Ottesen; Simonsen, Carmen Elisabeth; Agartz, Ingrid & Sundet, Kjetil Søren [Vis alle 7 forfattere av denne artikkelen] (2011). THC IN URINE IN SCHIZOPHRENIA: ASSOCIATIONS WITH SYMPTOM LEVELS AND NEUROCOGNITIVE FUNCTIONING. Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 279–280.
• Aas, Monica; Djurovic, Srdjan; Athanasiu, Lavinia; Steen, Nils Eiel; Agartz, Ingrid & Lorentzen, Steinar [Vis alle 9 forfattere av denne artikkelen] (2011). SEROTONIN TRANSPORTER GENE POLYMORPHISMS, CHILDHOOD TRAUMA AND COGNITION IN PATIENTS WITH PSYCHOTIC DISORDERS. Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 80–80.
• Melle, Ingrid; Evensen, Julie Horgen; Haahr, U.; Hegelstad, Wenche; Joa, Inge & Johannessen, Jan Olav [Vis alle 16 forfattere av denne artikkelen] (2011). Quality of life and recovery in psychotic disorders - 10 year follow-up of the tips study. Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 274–274.
• Holmen, Aina; Juuhl-Langseth, Monica; Thormodsen, Rune; Sundet, Kjetil Søren; Melle, Ingrid & Rund, Bjørn Rishovd (2011). WHICH TEST MEASURES BEST EXECUTIVE FUNCTIONS IN EARLY-ONSET SCHIZOPHRENIA? Schizophrenia Bulletin. ISSN 0586-7614. 37, s. 244–244.

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