Audun Rørvik Rosslund

• Visser, Ingmar; Geambasu, Andreea; Kachergis, George; Oliveira, Cátia M.; Rocha‐Hidalgo, Joscelin & Zettersten, Martin [Vis alle 84 forfattere av denne artikkelen] (2026). ManyBabies 3: A Multi‐Lab Study of Infant Algebraic Rule Learning. Developmental Science. ISSN 1363-755X. 29(6). doi: 10.1111/desc.70259. Fulltekst i vitenarkiv Vis sammendrag

  ABSTRACT The ability to learn and apply rules lies at the heart of cognition. In a seminal study, Marcus et al. (1999) reported that 7‐month‐old infants learned abstract rules over syllable sequences and were able to generalize those rules to novel syllable sequences. Dozens of studies have since replicated that finding and extended it using different rules, modalities, stimuli, participants (human adults and non‐human animals) and experimental procedures. Yet questions remain about the generalizability of the core findings in Marcus et al., and sources of variation across these findings. In the current study, we address this issue by testing 839 infants (650 after exclusions) of a wide age range (5;0–12;0 months) in a multi‐laboratory (30 laboratories, [31 samples]) conceptual replication of the Marcus et al. study. This study and the analysis plan were submitted as a registered report. A mixed‐model analysis of the looking times at consistent versus inconsistent test trials indicated no significant effect. The current study therefore finds no evidence for rule‐learning; to the contrary, a Bayesian analysis of the data indicated strong evidence for a null effect. This was similarly the case for the moderating factors that were part of the design: mono‐ versus multilingualism, age, and experimental paradigm; none of these factors showed significant effects. Robustness analyses indicated that the results were not different in the case of different choices in the (pre‐)processing of the data. A follow‐up analysis for single labs indicated that there was no evidence of rule‐learning in 30 of the 31 contributed samples. The current finding raises fundamental issues about rule‐learning that are presented in the Discussion section.

• Rosslund, Audun (2025). Learning words in context. Nature Reviews Psychology. doi: 10.1038/s44159-025-00526-x. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien & Kartushina, Natalia (2025). Norwegian parents do not modulate infant-directed speech based on their infants’ attributed word knowledge. Developmental Psychology. ISSN 0012-1649. doi: 10.1037/dev0002077. Fulltekst i vitenarkiv Vis sammendrag

  Infant-directed speech (IDS), the register caregivers often use when interacting with infants, has been suggested to facilitate language learning. To assess its didactic role, we examined the acoustic modifications parents make in IDS for words they attribute to their infant as unknown, versus known, by analyzing data from three studies of Norwegian IDS with 8- to 18-month-old infants (N = 132 infants, N = 182 parents). Parents’ speech was recorded during a shared-reading interaction with their infant and with an experimenter (as a control register), ensuring that speech content was matched across participants and registers. Contrary to our hypotheses, we found no evidence that parents emphasized IDS for words attributed as unknown. Furthermore, Bayesian analyses suggested that Norwegian parents do not modulate IDS based on infants’ attributed word knowledge. Thus, our findings do not support the notion that parents use IDS as a didactic strategy to teach individual words, underscoring alternative motivations for engaging in such speech.

• Rosslund, Audun; Kartushina, Natalia; Serres, Nora Rose & Mayor, Julien (2025). Early Vocabulary Acquisition: From Birth Order Effect to Child-to-Caregiver Ratio. Child Development. ISSN 0009-3920. 96(4), s. 1343–1353. doi: 10.1111/cdev.14251. Fulltekst i vitenarkiv Vis sammendrag

  Growing up with multiple siblings might negatively affect language development. This study examined the associations between birth order, sibling characteristics and parent-reported vocabulary size in 6163 Norwegian 8- to 36-month-old children (51.4% female). Results confirmed that birth order was negatively associated with vocabulary, yet exhibited a U-shaped pattern. A data-driven measure of “child-to-caregiver ratio” in the household was developed, in which old-enough siblings—females 1–3 years earlier than males—were considered caregivers for their younger siblings. This measure explained variance in vocabulary better than birth order, and indicates sex-differences in the age at which older siblings contribute to, rather than deplete, available resources. A child-to-caregiver ratio might better capture the interplay between language-learning resources and demands within households.

• Rosslund, Audun; Varjola, Nina; Mayor, Julien & Kartushina, Natalia (2025). Longitudinal changes in consonant production in infant-directed speech and infants’ early speech production from 6 to 12 months. Infant Behavior and Development. ISSN 0163-6383. 78. doi: 10.1016/j.infbeh.2024.102018. Fulltekst i vitenarkiv Vis sammendrag

  Previous research suggests that acoustic features of infant-directed speech (IDS) might be beneficial for infants’ language development. However, consonants have gained less attention than vowels and prosody. In the current study, we examined voice onset time (VOT) – a distinguishing cue for stop consonant contrasts – in IDS and adult-directed speech (ADS), and its relation to infants’ speech production. We used a longitudinal sample of 48 Norwegian parent-infant dyads. Parents’ IDS and ADS were recorded in-lab at three timepoints (infants’ age: 6, 9, 12 months), and the VOTs of the stop consonants /b-p/, /d-t/, and /g-k/ were measured. In addition, at each timepoint, parents reported their infants’ production of the same consonants, as well as their babbling. Hypotheses were preregistered, and we used full-null model comparisons to minimise type I-errors in the analyses. Our results demonstrate that, while controlling for speaking rate, in IDS, parents’ VOTs were longer in voiceless stops, but shorter in voiced stops, resulting in overall less distinct consonant contrasts compared to ADS. Further, VOTs in IDS approached ADS values with infants’ age. However, we found no relationship between parents’ VOTs and infants’ consonant production or babbling. Consonants, like vowels, appear to be less distinct in IDS than ADS, thus reinforcing the interpretation that IDS may serve an attentional and/or affective aim, rather than a didactic purpose.

• Rosslund, Audun; Mayor, Julien; Cristia, Alejandrina & Kartushina, Natalia (2024). Native and non-native vowel discrimination in 6-month-old Norwegian infants. Infant Behavior and Development. ISSN 0163-6383. 77. doi: 10.1016/j.infbeh.2024.101992. Fulltekst i vitenarkiv Vis sammendrag

  In the current preregistered study, we tested n = 67 6-month-old Norwegian infants’ discrimination of a native vowel contrast /y-i/ and a non-native (British) vowel contrast /ʌ-æ/ in an eye-tracking habituation paradigm. Our results showed that, on a group level, infants did not discriminate either contrast. Yet, exploratory analyses revealed a negative association between infants’ performance in each experiment, that is, better discrimination of the native contrast was associated with worse discrimination of the non-native contrast. Potentially, infants in this study might have been on the cusp of perceptual reorganisation towards their native language.

• Rosslund, Audun; Kartushina, Natalia & Mayor, Julien (2024). Associations between shared book reading, daily screen time and infants' vocabulary size. Journal of Child Language. ISSN 0305-0009. s. 1–13. doi: 10.1017/S0305000924000291. Fulltekst i vitenarkiv Vis sammendrag

  In the current pre-registered study, we examined the associations between shared book reading, daily screen time, and vocabulary size in 1,442 12- and 24-month-old Norwegian infants. Our results demonstrate a positive association between shared reading and vocabulary in both age groups, and a negative association between screen time and vocabulary in 24-month-olds. Exploratory analyses revealed that the positive relationship between shared reading and expressive vocabulary in 12-month-olds was stronger in lower SES groups, suggesting that shared reading may act as a compensatory mechanism attenuating potentially impoverished learning environment and parent-infant interactions in low-SES families.

• Rosslund, Audun; Mayor, Julien; Mundry, Roger; Singh, Arun Prakash; Cristia, Alejandrina & Kartushina, Natalia (2024). A longitudinal investigation of the acoustic properties of infant-directed speech from 6 to 18 months. Royal Society Open Science. 11(11), s. 1–33. doi: 10.1098/rsos.240572. Fulltekst i vitenarkiv Vis sammendrag

  Caregivers often modulate their speech when interacting with infants, adapting a register that has been suggested to have attentional, affective and didactic purposes. The present preregistered study examined the longitudinal trajectories of a diverse range of acoustic features of infant-directed speech (IDS) and compared these with adult-directed speech (ADS), in Norwegian parents of 6- to 18-month-old infants. Sixty-nine families participated. Throughout five laboratory visits across one year, parents were recorded reading a picture-book to their infant (IDS) and an experimenter (ADS). The book was designed to tightly control for the linguistic content and context of speech between participants, timepoints and registers. Analyses of a total of 54 594 vowels and 22 958 phrases revealed, first, an overall effect of register: parents used higher pitch, wider pitch range, slower articulation rate, longer vowel duration and more variable and less distinct vowels in IDS than in ADS. Second, significant register-by-age interactions indicated that parents’ IDS, compared with their ADS, featured wider pitch range, larger vowel space and shorter vowel duration in older as compared with younger infants, while pitch, articulation rate and vowel variability and distinctiveness remained relatively stable with age. Results are discussed in the context of the proposed functions of IDS.

• Rosslund, Audun; Hagelund, Silje; Mayor, Julien & Kartushina, Natalia (2023). Mothers' and fathers' infant-directed speech have similar acoustic properties, but these are not associated with direct or indirect measures of word comprehension in 8-month-old infants. Journal of Child Language. ISSN 0305-0009. doi: 10.1017/S0305000923000557. Fulltekst i vitenarkiv Vis sammendrag

  Previous research on infant-directed speech (IDS) and its role in infants’ language development has largely focused on mothers, with fathers being investigated scarcely. Here we examine the acoustics of IDS as compared to adult-directed speech (ADS) in Norwegian mothers and fathers to 8-month-old infants, and whether these relate to direct (eye-tracking) and indirect (parental report) measures of infants’ word comprehension. Forty-five parent-infant dyads participated in the study. Parents (24 mothers, 21 fathers) were recorded reading a picture book to their infant (IDS), and to an experimenter (ADS), ensuring identical linguistic context across speakers and registers. Results showed that both mothers’ and fathers’ IDS had exaggerated prosody, expanded vowel spaces, as well as more variable and less distinct vowels. We found no evidence that acoustic features of parents’ speech were associated with infants’ word comprehension. Potential reasons for the lack of such a relationship are discussed.

• Rosslund, Audun; Mayor, Julien; Óturai, Gabriella & Kartushina, Natalia (2022). Parents’ hyper-pitch and low vowel category variability in infant-directed speech are associated with 18-month-old toddlers’ expressive vocabulary. Language Development Research. 2(1), s. 223–267. doi: 10.34842/2022.0547. Fulltekst i vitenarkiv Vis sammendrag

  The present study examines the acoustic properties of infant-directed speech (IDS) as compared to adult-directed speech (ADS) in Norwegian parents of 18-month-old toddlers, and whether these properties relate to toddlers’ expressive vocabulary size. Twenty-one parent-toddler dyads from Tromsø, Northern Norway participated in the study. Parents (16 mothers, 5 fathers), speaking a Northern Norwegian dialect, were recorded in the lab reading a storybook to their toddler (IDS register), and to an experimenter (ADS register). The storybook was designed for the purpose of the study, ensuring identical linguistic contexts across speakers and registers, and multiple representations of each of the nine Norwegian long vowels. We examined both traditionally reported measures of IDS: pitch, pitch range, vowel duration and vowel space expansion, but also novel measures: vowel category variability and vowel category distinctiveness. Our results showed that Norwegian IDS, as compared to ADS, had similar characteristics as in previously reported languages: higher pitch, wider pitch range, longer vowel duration, and expanded vowel space area; in addition, it had more variable vowel categories. Further, parents’ hyper-pitch, that is, the within-parent increase in pitch in IDS as compared to ADS, and lower vowel category variability in IDS itself, were related to toddlers' vocabulary. Our results point towards potentially facilitating roles of increase in parents’ pitch when talking to their toddlers and of consistency in vowel production in early word learning.

• Lo, Chang Huan; Rosslund, Audun; Chai, Jun Ho; Mayor, Julien & Kartushina, Natalia (2021). Tablet assessment of word comprehension reveals coarse word representations in 18–⁠20‐month‐old toddlers. Infancy. ISSN 1525-0008. 26(4), s. 596–616. doi: 10.1111/infa.12401. Fulltekst i vitenarkiv Vis sammendrag

  The present study explores the viability of using tablets in assessing early word comprehension by means of a two‐alternative forced‐choice task. Forty‐nine 18–20‐month‐old Norwegian toddlers performed a touch‐based word recognition task, in which they were prompted to identify the labeled target out of two displayed items on a touchscreen tablet. In each trial, the distractor item was either semantically related (e.g., dog–cat) or unrelated (e.g., dog–airplane) to the target. Our results show that toddlers as young as 18 months can engage meaningfully with a tablet‐based assessment, with minimal verbal instruction and child–administrator interaction. Toddlers performed better in the semantically unrelated condition than in the related condition, suggesting that their word representations are still semantically coarse at this age. Furthermore, parental reports of comprehension, using the Norwegian version of the MacArthur–Bates Communicative Development Inventories, predicted toddlers’ performance, with parent–child agreement stronger in the semantically unrelated condition, indicating that parents declare a word to be known by their child if it is understood at a coarse representational level. This study provides among the earliest evidence that remote data collection in 18‐20 month‐old toddlers is viable, as comparable results were observed from both in‐laboratory and online administration of the touchscreen recognition task.

• Kartushina, Natalia; Rosslund, Audun & Mayor, Julien (2021). Toddlers raised in multi-dialectal families learn words better in accented speech than those raised in monodialectal families. Journal of Child Language. ISSN 0305-0009. doi: 10.1017/S0305000921000520. Fulltekst i vitenarkiv Vis sammendrag

  Abstract Multi-accent environments offer rich but inconsistent language input, as words are produced differently across accents. The current study examined, in two experiments, whether multi-accent variability affects infants’ ability to learn words and whether toddlers’ prior experience with accents modulates learning. In Experiment 1, two-and-a-half-year-old Norwegian toddlers were exposed, in their kindergarten, twice per day for one week, to a child-friendly audiovisual tablet-based e-book containing four novel pseudowords. Half of the toddlers heard the story in three Norwegian accents, whereas the other half heard it in one Norwegian accent. The results revealed no differences between conditions, suggesting that multi-accent variability did not hinder toddlers’ word learning. In experiment 2, two-and-a-half-year-old Norwegian toddlers were exposed, in their homes, for one week, to the e-book featuring three Norwegian accents. The results revealed overall better learning in toddlers raised in bi-dialectal households, as compared to mono-dialectal peers – suggesting that accent exposure benefits learning in multi-accent environments.

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• Boskovic, Ana; Rosslund, Audun Rørvik; Mayor, Julien & Kartushina, Natalia (2026). Statistical learning and word segmentation in Norwegian infants: No evidence across dialectal variability. Fulltekst i vitenarkiv
• Kartushina, Natalia; Rosslund, Audun Rørvik; Vangsnes, Øystein Alexander & Mayor, Julien (2026). Dialect exposure in infancy: Hurdle or help? New insights into language processing. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik; Serres, Nora Rose; Kartushina, Natalia & Mayor, Julien (2025). Early language acquisition: From birth order effect to child-to-caregiver ratio. Fulltekst i vitenarkiv
• Otto, Sofie; Kartushina, Natalia; Rosslund, Audun Rørvik & Mayor, Julien (2025). Parents’ attitudes and early parent-child interactions: Insights from a language-generic intervention on multilingual families. Fulltekst i vitenarkiv
• Boskovic, Ana; Kartushina, Natalia; Mayor, Julien & Rosslund, Audun Rørvik (2025). The impact of dialectal variability on word segmentation in infancy: Insights from Norway. Fulltekst i vitenarkiv
• Serres, Nora Rose; Mayor, Julien; Kartushina, Natalia & Rosslund, Audun Rørvik (2025). Dialectal variability shapes early language development: Evidence from mispronunciation sensitivity in 13-month-old infants. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik; Kartushina, Natalia; Serres, Nora Rose & Mayor, Julien (2025). Negative sibling effects revised: When a sibling becomes a caregiver. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik; Mayor, Julien & Kartushina, Natalia (2025). No evidence that Norwegian parents tailor infant-directed speech based on attributed word knowledge. Fulltekst i vitenarkiv
• Kartushina, Natalia; Mayor, Julien; White, Michelle Jennifer; Gundersen, Anni Sofie Myrtveit; Onnis, Luca & Hagelund, Silje [Vis alle 9 forfattere av denne artikkelen] (2025). Reliability of acoustic measures of infant-directed speech between lab and home environments and play and reading contexts. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2025). Ny forskning om spedbarnsrettet tale og språkutvikling. [Journal]. Norsk Tidsskrift for Logopedi. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2025). Stemmen din kan påvirke barnas ordforråd. [Journal]. Første Steg, Utdanningsnytt.no. doi: https:/www.utdanningsnytt.no/babysprak-barnehageforsker-barnehageforskning/stemmen-din-kan-pavirke-barnas-ordforrad/437184. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2025). The whole family contributes to the baby's language development. [Internet]. NewsGram, Eurasia Review. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2025). Storesøsken påvirker minstemanns språkutvikling, men kanskje ikke som du tror. [Journal]. Aftenposten, Adresseavisen, Bergens Tidende, Stavanger Aftenblad, Fædrelandsvennen, Sunnmørsposten, Romsdals Budstikke. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2025). Barns språkutvikling: – Dynamikken i hjemmet er avgjørende, ikke fødselsrekkefølgen. [Internet]. Barnehage.no. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2025). Hele familien bidrar til minstens språkutvikling. [Internet]. Forskning.no. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2025). Studie: Noen hunder kan forstå mer språk enn vi har trodd. [Internet]. Forskning.no. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2024). Reading to your 1- and 2-year old boosts their vocabulary, study finds. [Internet]. U.S. News & World Report, Medical Xpress, HealthDay, The Bump. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2024). Studie: Småbarn som blir lest for, har et bedre ordforråd. [Journal]. Adresseavisen, Bergens Tidende. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2024). Det skjedde noe i hundenes hjerne når de hørte kjente ord. [Internet]. Forskning.no. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Mundry, Roger; Singh, Arun Prakash; Cristia, Alejandrina & Kartushina, Natalia (2024). A longitudinal investigation of the acoustic properties of infant-directed speech from 6 to 18 months. Fulltekst i vitenarkiv
• Munoz, Luis Eduardo; Rosslund, Audun; Kartushina, Natalia & Mayor, Julien (2024). Pacifier use is associated with reduced word comprehension in early childhood. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Mundry, Roger; Singh, Arun Prakash; Cristia, Alejandrina & Kartushina, Natalia (2024). A longitudinal investigation of the acoustic properties of infant-directed speech from 6 to 18 months. Fulltekst i vitenarkiv
• Rosslund, Audun; Hatlevoll, Nina Emilie Varjola; Mayor, Julien & Kartushina, Natalia (2024). Longitudinal changes in consonant production in infant-directed speech and infants’ early speech production from 6 to 12 months. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Cristia, Alejandrina & Kartushina, Natalia (2024). Native and non-native vowel discrimination in 6-month-old Norwegian infants. Fulltekst i vitenarkiv
• Munoz, Luis Eduardo; Rosslund, Audun; Kartushina, Natalia & Mayor, Julien (2024). No evidence of native sound discrimination in Norwegian 9-month-old infants using an eye-tracking habituation paradigm. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2023). Norske pappaer endrer stemmen når de snakker med babyen sin. [Internet]. Forskning.no. Fulltekst i vitenarkiv
• Hatlevoll, Nina Emilie Varjola; Rosslund, Audun; Mayor, Julien & Kartushina, Natalia (2023). Voice onset time in Norwegian infant directed speech: A longitudinal study on the relationship between consonant production in parents’ IDS and infants’ babbling. Fulltekst i vitenarkiv
• Rosslund, Audun; Hagelund, Silje; Mayor, Julien & Kartushina, Natalia (2023). Mothers’ and fathers’ infant- directed speech have similar acoustic properties, but these are not associated with direct or indirect measures of word comprehension in 8-month-old infants. Fulltekst i vitenarkiv
• Rosslund, Audun; Kartushina, Natalia & Mayor, Julien (2023). Associations between shared book reading and vocabulary size are stronger among lower-SES infants. Fulltekst i vitenarkiv
• Munoz, Luis Eduardo; Rosslund, Audun; Mayor, Julien & Kartushina, Natalia (2023). No evidence of native sound discrimination in Norwegian 9-month-old infants using an eye-tracking habituation paradigm. Fulltekst i vitenarkiv
• Rosslund, Audun (2023). Stemmen din kan påvirke barnas språkutvikling. Første steg. ISSN 1504-1891. Fulltekst i vitenarkiv
• Kartushina, Natalia; Onnis, Luca; Rosslund, Audun; Singh, Arun Prakash; White, Michelle Jennifer & Theimann, Ane [Vis alle 14 forfattere av denne artikkelen] (2023). Babies and kids - how do they acquire and learn multiple lects? Fulltekst i vitenarkiv
• Rosslund, Audun; Gonzalez, Elisabet Garcia; Olstad, Anne Marte Haug & White, Michelle Jennifer (2022). Pitfalls in experimental designs: Assumptions and misconceptions. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien & Kartushina, Natalia (2022). Barns ordforråd skjøt fart når barnehagene stengte ned under pandemien. Første steg. ISSN 1504-1891. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Óturai, Gabriella & Kartushina, Natalia (2022). Parents’ hyper pitch and vowel category compactness in infant-directed speech are associated with 18-month-old toddlers’ expressive vocabulary. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Óturai, Gabriella & Kartushina, Natalia (2022). Parents’ hyper pitch and vowel category compactness in infant-directed speech are associated with 18-month-old toddlers’ expressive vocabulary. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Óturai, Gabriella & Kartushina, Natalia (2022). Parents’ hyper pitch and vowel category compactness in infant-directed speech are associated with 18-month-old toddlers’ expressive vocabulary. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Óturai, Gabriella & Kartushina, Natalia (2022). Parents’ hyper pitch and vowel category compactness in infant-directed speech are associated with 18-month-old toddlers’ expressive vocabulary. Fulltekst i vitenarkiv
• Rosslund, Audun; Roepstorff, Ida; Lo, Chang Huan; Chai, Jun Ho; Mayor, Julien & Kartushina, Natalia (2022). Alignments between direct tablet-based assessment of word comprehension and parent reports depend on child’s age and word properties. Fulltekst i vitenarkiv
• Rosslund, Audun; Kartushina, Natalia; Mayor, Julien; Chai, Jun Ho & Lo, Chang Huan (2021). Tablet assessment of word comprehension reveals coarse word representations in 18-20-month-old toddlers. Fulltekst i vitenarkiv
• Rosslund, Audun; Mayor, Julien; Óturai, Gabriella & Kartushina, Natalia (2021). Babytalk in Tromsø. Fulltekst i vitenarkiv
• Rosslund, Audun (2021). Hunder kan kjenne igjen ord på samme måte som barn. [Internet]. Forskning.no. Fulltekst i vitenarkiv
• Kartushina, Natalia; Rosslund, Audun Rørvik & Mayor, Julien (2020). Toddlers raised in multi- dialectal families learn words better in accented speech than those raised in monodialectal families. Fulltekst i vitenarkiv
• Kartushina, Natalia; Rosslund, Audun Rørvik & Mayor, Julien (2020). Toddlers raised in multi- dialectal families learn words better in accented speech than those raised in monodialectal families. Fulltekst i vitenarkiv
• Kartushina, Natalia; Rosslund, Audun Rørvik & Mayor, Julien (2020). Toddlers raised in multi- dialectal families learn words better in accented speech than those raised in monodialectal families. Fulltekst i vitenarkiv
• Rosslund, Audun Rørvik (2015). Mestring og risikofylt lek i barnehagen. Første steg. ISSN 1504-1891. Fulltekst i vitenarkiv
• Rosslund, Audun; Kartushina, Natalia & Mayor, Julien (2024). The acoustic properties and role of infant-directed speech in early language development – Longitudinal and cross-sectional studies. Universitetet i Oslo. Fulltekst i vitenarkiv Vis sammendrag

  How do caregivers fine-tune their speech when interacting with infants? Do these potential modulations support infants’ language development? In this dissertation, Rosslund and colleagues tackle these questions and address gaps in the scientific literature on so-called infant-directed speech (IDS). Accumulated across four preregistered studies, the dissertation provides both longitudinal and cross-sectional evidence that Norwegian parents modulate the intonational, temporal, and segmental features of their speech to infants. However, some of these acoustic modulations challenge the notion that IDS is directly tailored to facilitate language learning. This is further supported by the lack of associations between properties of parents’ IDS and infants’ language outcomes from 6 to 12 months of age. Additionally, at 18 months, infants who receive speech input with more variable vowel categories have smaller vocabularies than their peers. Yet, at the same age, parents who adapt a more exaggerated pitch height in IDS have infants with larger vocabularies. Thus, IDS might only indirectly support language development by attracting infants’ attention to the parent and speech stream, in turn bootstrapping language processing mechanisms. This dissertation contributes to the empirical evidence and theoretical debate regarding IDS by presenting analyses of a comprehensive set of acoustic properties of speech and their relationship with infants’ language outcomes, thereby providing a more explicit test of its proposed role in language development. Notably, our studies are coupled with open materials and data, inviting continued exploration and promoting scientific progress.

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