Slow brain potentials in the CNV-paradigm
Instituut voor Zintuigfysiologie TNO
Slow brain potentials were recorded during the foreperiod of a reaction time task, and the effects of instructions governing the trade-off between speed and accuracy were investigated. One brain potential, a slow negative shift preceding S2, was largely attenuated under accuracy instructions. It is suggested that this shift is dependent on a motor response and that its amplitude reflects the level of motor preparation. Two other brain potentials, a slow positive and a slow negative wave, seem to depend on the psychological properties of S1. Enhanced amplitudes were found, when S1 provides information, besides its warning function.
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Contingent Negative Variation
Acta Psychologica, 44 (2), 147-163