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Related Experiment Videos

Risk-taking and the human bereitschaftspotential.

R F Hink, H Kohler, L Deecke

    Electroencephalography and Clinical Neurophysiology
    |April 1, 1982
    PubMed
    Summary
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    The human Bereitschaftspotential (BP) brain signal increased when participants took risks by guessing unlikely outcomes. This finding suggests BP reflects intentions related to psychological state changes.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Human Brain Activity

    Background:

    • The Bereitschaftspotential (BP) is a slow negative potential shift recorded over the scalp preceding voluntary movement.
    • Understanding factors influencing BP generation is crucial for deciphering the neural basis of intention and decision-making.

    Purpose of the Study:

    • To investigate how response probability and feedback predictability affect the human Bereitschaftspotential (BP).
    • To determine if the BP is modulated by the psychological state associated with risk-taking in decision-making tasks.

    Main Methods:

    • A probability-matching paradigm was employed where subjects guessed feedback light outcomes with known a priori probabilities (30%-70%).
    • The experiment involved conditions of both unpredictable and perfectly predictable feedback.

    Related Experiment Videos

  • Electroencephalography (EEG) was used to measure the BP preceding button presses.

    • Main Results:

    • The BP was significantly enhanced specifically when subjects chose the improbable feedback option under unpredictable conditions, indicating risk-taking behavior.
    • This enhancement of BP during risk-taking was observed independently of any concurrent contingent negative variation (CNV).

    Conclusions:

    • The human Bereitschaftspotential (BP) is sensitive to moment-to-moment variations in psychological states.
    • These findings suggest that the BP is linked to the neural processes underlying intention, particularly when individuals engage in risky choices.