Asano, Michiko, Imai, Mutsumi, Kita, Sotaro, Kitajo, Keiichi, Okada, Hiroyuki and Thierry, Guillaume (2015) Sound symbolism scaffolds language development in preverbal infants. Cortex, Volume 63 . pp. 196-205. doi:10.1016/j.cortex.2014.08.025

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Abstract

A fundamental question in language development is how infants start to assign meaning to words. Here, using three Electroencephalogram (EEG)-based measures of brain activity, we establish that preverbal 11-month-old infants are sensitive to the non-arbitrary correspondences between language sounds and concepts, that is, to sound symbolism. In each trial, infant participants were presented with a visual stimulus (e.g., a round shape) followed by a novel spoken word that either sound-symbolically matched (“moma”) or mismatched (“kipi”) the shape. Amplitude increase in the gamma band showed perceptual integration of visual and auditory stimuli in the match condition within 300 msec of word onset. Furthermore, phase synchronization between electrodes at around 400 msec revealed intensified large-scale, left-hemispheric communication between brain regions in the mismatch condition as compared to the match condition, indicating heightened processing effort when integration was more demanding. Finally, event-related brain potentials showed an increased adult-like N400 response – an index of semantic integration difficulty – in the mismatch as compared to the match condition. Together, these findings suggest that 11-month-old infants spontaneously map auditory language onto visual experience by recruiting a cross-modal perceptual processing system and a nascent semantic network within the first year of life.

Item Type:	Journal Article
Subjects:	B Philosophy. Psychology. Religion > BF Psychology P Language and Literature > P Philology. Linguistics
Divisions:	Faculty of Science > Psychology
Library of Congress Subject Headings (LCSH):	Language acquisition, Sound symbolism
Journal or Publication Title:	Cortex
Publisher:	Elsevier Masson
ISSN:	0010-9452
Official Date:	February 2015
Dates:	Date Event February 2015 Published 16 September 2014 Available 26 August 2014 Accepted 1 February 2014 Submitted
Volume:	Volume 63
Page Range:	pp. 196-205
DOI:	10.1016/j.cortex.2014.08.025
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Japan. Monbu Kagakushō [Japan. Ministry of Education, Culture, Sports, Science and Technology] (MK), Economic and Social Research Council (Great Britain) (ESRC), European Research Council (ERC), Nihon Gakujutsu Shinkōkai [Japan Society for the Promotion of Science] (NGS)
Grant number:	BB/G023069/1 (BBSRC), 15300088 (MEXT), 22243043 (MEXT), 23120003 (MEXT), 21120005 (MEXT), ES/ E024556/1 (ESRC), ERC-SG-209704 (ERC), 23-2872 (JSPS)
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID BB/G023069/1 Biotechnology and Biological Sciences Research Council http://dx.doi.org/10.13039/501100000268

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