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Delayed auditory feedback and aphasia.

F Boller, P B Vrtunski, Y Kim

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |June 1, 1978
    PubMed
    Summary
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    Delayed Auditory Feedback (DAF) impacts speech in all individuals, including those with aphasia. However, non-fluent aphasics show a greater DAF effect than fluent aphasics, particularly with shorter delays.

    Area of Science:

    • Neuroscience
    • Speech-Language Pathology
    • Auditory Processing

    Background:

    • Delayed Auditory Feedback (DAF) is known to affect speech production.
    • Previous research has yielded mixed results regarding the impact of DAF on individuals with aphasia.

    Purpose of the Study:

    • To investigate the effects of DAF on speech production in normal controls and individuals with fluent and non-fluent aphasia.
    • To compare the magnitude of DAF effects across different aphasia types and speech tasks.
    • To explore the influence of different delay durations on DAF effects.

    Main Methods:

    • Three groups (normal controls, non-fluent aphasics, fluent aphasics) participated.
    • Speech production tasks included repetition, naming, sentence production, question answering, reciting, and reading.

    Related Experiment Videos

  • Two delay intervals (180 msec and 360 msec) were used, and speech changes were rated by independent judges.

    • Main Results:

    • All subjects exhibited some DAF effect, contrary to some prior reports.
    • Non-fluent aphasics demonstrated a significantly larger DAF effect compared to fluent aphasics.
    • The 180 msec delay produced a greater overall DAF effect than the 360 msec delay, with question answering showing the largest effect.

    Conclusions:

    • DAF influences speech production in individuals with and without aphasia.
    • Aphasia type differentially affects the response to DAF, with non-fluent forms showing greater disruption.
    • DAF's impact may stem from distinct speech monitoring systems, one unaffected by aphasia and another sensitive to its pathology.