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  • Title: Inner speech impairments in autism.
    Author: Whitehouse AJ, Maybery MT, Durkin K.
    Journal: J Child Psychol Psychiatry; 2006 Aug; 47(8):857-65. PubMed ID: 16899000.
    Abstract:
    BACKGROUND: Three experiments investigated the role of inner speech deficit in cognitive performances of children with autism. METHODS: Experiment 1 compared children with autism with ability-matched controls on a verbal recall task presenting pictures and words. Experiment 2 used pictures for which the typical names were either single syllable or multisyllable. Two encoding conditions manipulated the use of verbal encoding. Experiment 3 employed a task-switching paradigm for which performance has been shown to be contingent upon inner speech. RESULTS: In Experiment 1, children with autism demonstrated a lower picture-superiority effect compared to controls. In Experiment 2, the children with autism showed a lower word-length effect when pictures were presented alone, but a more substantial word-length effect in a condition requiring overt labelling. In Experiment 3, articulatory suppression affected the task-switching performance of the control participants only. CONCLUSIONS: Individuals with autism have limitations in their use of inner speech.
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