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Napping facilitates word learning in early lexical development
Author(s) -
Horváth Klára,
Myers Kyle,
Foster Russell,
Plunkett Kim
Publication year - 2015
Publication title -
journal of sleep research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 117
eISSN - 1365-2869
pISSN - 0962-1105
DOI - 10.1111/jsr.12306
Subject(s) - nap , vocabulary , psychology , session (web analytics) , audiology , task (project management) , cognition , word learning , word (group theory) , sleep (system call) , vocabulary development , cognitive psychology , computer science , medicine , linguistics , social psychology , philosophy , management , neuroscience , world wide web , economics , operating system
Summary Little is known about the role that night‐time sleep and daytime naps play in early cognitive development. Our aim was to investigate how napping affects word learning in 16‐month‐olds. Thirty‐four typically developing infants were assigned randomly to nap and wake groups. After teaching two novel object–word pairs to infants, we tested their initial performance with an intermodal preferential looking task in which infants are expected to increase their target looking time compared to a distracter after hearing its auditory label. A second test session followed after approximately a 2‐h delay. The delay contained sleep for the nap group or no sleep for the wake group. Looking behaviour was measured with an automatic eye‐tracker. Vocabulary size was assessed using the Oxford Communicative Development Inventory. A significant interaction between group and session was found in preferential looking towards the target picture. The performance of the nap group increased after the nap, whereas that of the wake group did not change. The gain in performance correlated positively with the expressive vocabulary size in the nap group. These results indicate that daytime napping helps consolidate word learning in infancy.