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Introducing the Intra-Individual Variability Hypothesis in Explaining Individual Differences in Language Development




TekijätKautto, Anna; Railo, Henry; Mainela-Arnold, Elina

KustantajaAmerican Speech-Language-Hearing Association

Julkaisuvuosi2024

JournalJournal of Speech, Language, and Hearing Research

Tietokannassa oleva lehden nimiJournal of speech, language, and hearing research : JSLHR

Lehden akronyymiJ Speech Lang Hear Res

Vuosikerta67

Numero8

Aloitussivu2698

Lopetussivu2707

ISSN1092-4388

eISSN1558-9102

DOIhttps://doi.org/10.1044/2024_JSLHR-23-00527

Verkko-osoitehttps://doi.org/10.1044/2024_JSLHR-23-00527

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/457024707

Preprintin osoitehttps://osf.io/nkuv9/download


Tiivistelmä

Purpose: Response times (RTs) are commonly used in studying language acquisition. However, previous research utilizing RT in the context of language has largely overlooked the intra-individual variability (IIV) of RTs, which could hold significant information about the processes underlying language acquisition.

Method: We explored the association between language abilities and RT variability in visuomotor tasks using two data sets from previously published studies. The participants were 7- to 10-year-old children (n = 77).

Results: Our results suggest that increased variability in RTs is associated with weaker language abilities. Specifically, this within-participant variability in visuomotor RTs, especially the proportion of unusually slow responses, predicted language abilities better than mean RTs, a factor often linked to language skills in past research.

Conclusions: Based on our findings, we introduce the IIV hypothesis in explaining individual differences in language development. According to our hypothesis, inconsistency in the timing of cognitive processes, reflected by increased IIV in RTs, degrades learning different aspects of language, and results in individual differences in language abilities. Future studies should further examine the relationship between IIV and language abilities, and test the extent to which the possible relationship is causal.


Ladattava julkaisu

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Julkaisussa olevat rahoitustiedot
This research was financially supported by the University of Turku Graduate School wages awarded to the first author, an anonymous endowed fund to the University of Turku Speech-Language Pathology, and Kommunalrådet C. G. Sundells Stiftelse funds to the Child language research group in Åbo Akademi University Logopedics. The authors thank the Steps to the Healthy Development and Well-being of Children Cohort Study for assistance in recruiting children and University of Turku Speech-Language Pathology students for their assistance in data collection. Finally, they thank the children and families who participated.


Last updated on 2025-15-08 at 15:24