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Related Experiment Videos

Infant intermodal speech perception is a left-hemisphere function.

K MacKain, M Studdert-Kennedy, S Spieker

    Science (New York, N.Y.)
    |March 18, 1983
    PubMed
    Summary
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    Prelinguistic infants can perceive speech across senses, but only when attention is directed to the right. This suggests rightward attention and left-hemisphere processing aid intermodal speech perception.

    Area of Science:

    • Developmental psychology
    • Neuroscience
    • Linguistics

    Background:

    • Infants' ability to integrate auditory and visual speech information is crucial for language acquisition.
    • Previous research indicates infants process speech sounds and visual cues.

    Purpose of the Study:

    • To investigate if prelinguistic infants can detect structural correspondences between auditory and visual speech.
    • To determine the role of attentional orientation and brain hemisphere in this intermodal perception.

    Main Methods:

    • Presenting synchronized auditory and visual speech stimuli (disyllables) to prelinguistic infants.
    • Recording infants' looking behavior and correlating it with stimulus properties.
    • Analyzing perception based on infants' looking direction (left vs. right).

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    Main Results:

    • Infants recognized structural correspondences in synchronized speech stimuli.
    • This recognition occurred exclusively when infants were looking to their right.
    • No recognition was observed when infants looked to their left.

    Conclusions:

    • Rightward attentional orientation facilitates intermodal speech perception in prelinguistic infants.
    • Left-hemisphere processing likely underlies this ability, as suggested by the rightward bias.
    • Findings provide insights into the early neural and cognitive mechanisms of speech perception.