title: Effect of speaker gaze on word learning in fragile X syndrome: a comparison with nonsyndromic autism spectrum disorder.
abstract: OBJECTIVE
  This study examined use of a speaker's direction of gaze during word learning by boys with fragile X syndrome (FXS), boys with nonsyndromic autism spectrum disorder (ASD), and typically developing (TD) boys.
  
  
  METHODS
  A fast-mapping task with follow-in and discrepant labeling conditions was administered. We expected that the use of speaker gaze would lead to participants selecting as the referent of the novel label the object to which they attended in follow-in trials and the object to which the examiner attended in the discrepant labeling trials. Participants were school-aged boys with FXS (n=18) or ASD (n=18) matched on age, intelligence quotient, and nonverbal cognition and younger TD boys (n=18) matched on nonverbal cognition.
  
  
  RESULTS
  All groups performed above chance in both conditions, although the TD boys performed closest to the expected pattern. Boys with FXS performed better during follow-in than in discrepant label trials, whereas TD boys and boys with ASD did equally well in both trial types. The type of trial administered first influenced subsequent responding. Error patterns also distinguished the groups.
  
  
  CONCLUSIONS
  The ability to utilize a speaker's gaze during word learning is not as well developed in boys with FXS or nonsyndromic ASD as in TD boys of the same developmental level.
authors: David P
authors: DP
authors: Benjamin
authors: Andrea S
authors: AS
authors: McDuffie
authors: Angela J
authors: AJ
authors: Thurman
authors: Sara T
authors: ST
authors: Kover
authors: Ann M
authors: AM
authors: Mastergeorge
authors: Randi J
authors: RJ
authors: Hagerman
authors: Leonard
authors: L
authors: Abbeduto
mesh_terms: D000067877:Autism Spectrum Disorder / Q000523:psychology*; D002648:Child; D002663:Child Language; D002675:Child, Preschool; D003071:Cognition; D005403:Fixation, Ocular; D005600:Fragile X Syndrome / Q000523:psychology*; D006801:Humans; D007360:Intelligence; D008297:Male; D013067:Speech Perception / Q000502:physiology; D014706:Verbal Learning / Q000502:physiology*
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