Averaged Evoked Responses in Vigilance and Discrimination: A Reassessment

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Science  18 Apr 1969:
Vol. 164, Issue 3877, pp. 326-328
DOI: 10.1126/science.164.3877.326


With the use of monopolar recordings for averaged evoked responses, detected signals in a vigilance task are associated with a late positive component which is absent for undetected signals as well as nonsignals. Bipolar recordings obscure the late positive component associated with detected signals. The data suggest that the late positive component represents cerebral processes associated with evaluation of unpredictable changes in stimulation.

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