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Related Experiment Videos

E.E.G. alpha feedback--a comparison of two control groups

P Williams

    Psychosomatic Medicine
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Belief in receiving contingent feedback, not the feedback itself, increased alpha brain activity. This suggests that a subject's knowledge and beliefs are crucial in biofeedback situations.

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    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Psychophysiology

    Background:

    • The role of veridical (accurate) feedback in enhancing alpha brain wave activity during biofeedback is debated.
    • Instructional variables may significantly influence outcomes in biofeedback studies.

    Purpose of the Study:

    • To investigate whether perceived feedback contingency, rather than actual feedback accuracy, drives increases in alpha activity.
    • To determine the impact of subject beliefs on biofeedback outcomes.

    Main Methods:

    • Two groups of subjects received false (non-veridical) feedback during an alpha activity training task.
    • One group was led to believe their feedback was contingent on their alpha levels, while the other group's belief status was not specified but implied non-contingency.

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    Main Results:

    • Increases in alpha index were observed exclusively in the group that believed they were receiving contingent feedback.
    • No significant alpha activity increases were noted in subjects not believing in feedback contingency.

    Conclusions:

    • Subjective belief and knowledge about the feedback process are critical determinants of alpha activity changes in biofeedback.
    • The psychological state of the participant, specifically their belief in contingency, plays a more significant role than the objective accuracy of the feedback.