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Related Experiment Videos

Slow potentials preceding vocalisation

J A Empson

    Biological Psychology
    |May 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Brain activity (slow potentials) before speech differs when repeating words versus generating new ones. Handedness influences these electrical patterns, suggesting they are not solely due to movement artifacts.

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    Area of Science:

    • Neuroscience
    • Cognitive Science
    • Psychophysiology

    Background:

    • Understanding the neural basis of speech production is crucial for cognitive neuroscience.
    • Slow cortical potentials (SCPs) preceding voluntary movements are well-studied, but their role in speech generation is less clear.
    • Distinguishing genuine neural signals from artifacts (e.g., movement, respiration) in scalp-recorded potentials is a persistent challenge.

    Purpose of the Study:

    • To investigate the characteristics of slow potentials preceding vocalized speech.
    • To examine how task demands (word repetition vs. novel word generation) affect these pre-speech potentials.
    • To explore the influence of handedness and sex on the asymmetry of these potentials.

    Main Methods:

    • Recorded electroencephalography (EEG) slow potentials from 24 participants (males/females, left/right-handers).

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  • Subjects vocalized either the same word ('Yes') repeatedly or a subject-chosen novel word on each trial.
  • Analyzed the timing and scalp distribution of negative potentials preceding vocalization.

    • Main Results:

    • Pre-vocalization negativity occurred earlier when generating novel words compared to repeating the same word.
    • EEG asymmetry patterns differed based on handedness.
    • Frontal asymmetry was observed in females, while central asymmetry was found in males.

    Conclusions:

    • Task-related differences in pre-speech slow potentials suggest they reflect cognitive processes involved in speech generation, not just motor artifacts.
    • Handedness-dependent asymmetries in these potentials provide further evidence for their neural origin.
    • These findings indicate that slow potentials preceding speech are not entirely confounded by movement and respiratory artifacts.