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Related Experiment Videos

Relation between warning stimuli and contingent negative variation in man.

J F Hamon1, B Seri

  • 1Laboratoire de Physiologie Animale et de Psychophysiologie, Faculté des Sciences et Techniques, Cote d'Ivoire, West Africa.

Activitas Nervosa Superior
|December 1, 1987
PubMed
Summary

Contingent negative variation (CNV) amplitude increases with expectation of an additional stimulus. CNV voltage decreases when motor preparation follows imperative stimuli, suggesting it reflects general anticipation and orienting processes.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychophysiology

Background:

  • Contingent negative variation (CNV) is a slow negative electroencephalographic wave.
  • CNV is associated with anticipation of stimuli and preparation for motor responses.

Purpose of the Study:

  • To investigate the relationship between CNV and slow negative waves.
  • To determine how warning stimuli influence CNV amplitude in relation to subsequent events.

Main Methods:

  • Seven right-handed male students participated.
  • Standard and target paired auditory stimuli were presented.
  • Electroencephalography (EEG) was used to record brain activity, specifically CNV.

Main Results:

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  • CNV amplitude increased in the standard warning stimulus condition.
  • Increased CNV amplitude was linked to enhanced expectation of an additional stimulus.
  • Lowered CNV voltage was observed in the target condition, associated with motor preparation.

    • Conclusions:

    • CNV may reflect general anticipatory processes.
    • CNV might also represent orienting processes related to the signal value of warning stimuli.
    • The findings suggest CNV's role in cognitive and motor preparation.