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Related Experiment Videos

Rhythmic and segmental perception are not independent.

J G Martin

    The Journal of the Acoustical Society of America
    |May 1, 1979
    PubMed
    Summary
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    Altering speech tempo by changing vowel duration impacts reaction times to speech segments. These tempo changes primarily affect stimulus expectancy, not processing speed, influencing perception of intact speech.

    Area of Science:

    • Psycholinguistics
    • Auditory Perception
    • Speech Processing

    Background:

    • Speech perception involves processing both acoustic and temporal aspects of utterances.
    • Understanding how temporal distortions affect speech perception is crucial for models of auditory processing.

    Purpose of the Study:

    • To investigate the impact of altered speech tempo on reaction times to specific speech segments.
    • To determine whether tempo changes influence processing time or stimulus expectancy in perception.

    Main Methods:

    • Nonsense sentences with systematically altered vowel durations (lengthened/shortened) were created.
    • Listeners' reaction times (RT) to target consonants (/b, d, g/) were measured in tempo-changed versus intact sentences.
    • Over 2000 sentence versions were tested across multiple syllables and temporal manipulations.

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    Main Results:

    • Tempo changes, achieved through vowel duration manipulation, generally increased reaction times to target segments.
    • These tempo-change effects were widespread, influencing targets in later syllables even when the distortion occurred early.
    • The influence of tempo changes shifted from processing time effects to stimulus expectancy effects as the sentence progressed.

    Conclusions:

    • The primary driver of altered reaction times due to tempo distortion is changes in stimulus expectancy, not processing time.
    • Auditory perception relies on intact rhythmic and segmental aspects of speech, which are processed interdependently.