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Related Experiment Videos

Cognitive determinants of the postimperative negative variation.

N Kathmann1, L Jonitz, R R Engel

  • 1Experimental and Clinical Psychology Unit, Psychiatric Hospital, University of Munich, Federal Republic of Germany.

Psychophysiology
|May 1, 1990
PubMed
Summary

Contingency changes, not just lack of control, significantly influence brain potentials like the postimperative negative variation (PINV). Unpredictable control also impacts PINV, suggesting cognitive factors are key determinants.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • The postimperative negative variation (PINV) is a slow brain potential observed after a forewarned reaction time task stimulus.
  • Understanding the cognitive factors influencing PINV is crucial for interpreting brain activity in response to stimuli.

Purpose of the Study:

  • To investigate the cognitive determinants of the postimperative negative variation (PINV).
  • To examine how controllability and predictability of aversive stimuli affect PINV.

Main Methods:

  • A factorial design was employed to vary stimulus controllability and contingency predictability.
  • The exogenous component of the slow negative wave was measured in a passive listening condition.
  • Participants completed a forewarned reaction time task with varying control and predictability conditions.

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Main Results:

  • PINV was observed not only during lack of control but also during unpredictably gained control.
  • Unpredictable lack of control resulted in a more negative potential compared to continual helplessness.
  • The negativity from the aversive tone alone was comparable to PINV during predictable lack of control.

Conclusions:

  • Contingency change is a critical cognitive determinant of PINV.
  • The influence of lack of control on PINV is difficult to distinguish from the sensory effects of acoustic stimulation.