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Related Experiment Videos

Self-stimulation alters human sensory brain responses.

E W Schafer, M M Marcus

    Science (New York, N.Y.)
    |July 13, 1973
    PubMed
    Summary

    Brain responses to self-generated sounds and sights are weaker and faster than those from external sources. This "self-stimulation effect" varies between senses and is linked to intelligence levels.

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    Area of Science:

    • Neuroscience
    • Cognitive Science
    • Psychology

    Background:

    • Electrocortical potentials reflect brain activity in response to stimuli.
    • Previous research has noted differences in brain responses to external versus self-generated stimuli.

    Purpose of the Study:

    • To investigate the
    • self-stimulation effect
    • in human electrocortical potentials.
    • To compare this effect for auditory and visual stimuli.
    • To explore the relationship between the self-stimulation effect and intelligence.

    Main Methods:

    • Evoked potentials were recorded in humans.
    • Stimuli were delivered both by the participant (self-administered) and by a machine.
    • Auditory and visual stimuli were used.
    • Brain responses were analyzed for amplitude and poststimulus timing.

    Main Results:

    • Self-administered stimuli produced smaller amplitude and faster poststimulus timing compared to machine-delivered stimuli.
    • The self-stimulation effect was more pronounced for auditory evoked potentials than for visual evoked potentials.
    • For visual evoked potentials, the effect was greater at the vertex than the occipital cortex.
    • Individual differences in the magnitude of the self-stimulation effect correlated with intelligence levels.

    Conclusions:

    • Humans exhibit a distinct
    • self-stimulation effect
    • influencing brain responses to sensory input.
    • This effect is modality-specific and shows distinct topographical patterns.
    • The self-stimulation effect is modulated by individual cognitive abilities, such as intelligence.

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