A brain event related to the making of a sensory discrimination

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Science  30 Mar 1979:
Vol. 203, Issue 4387, pp. 1358-1361
DOI: 10.1126/science.424760


Event-related potentials associated with detected targets in a vigilance task were analyzed in two ways: (i) by sorting the potentials in terms of sequential reaction time bins of 50 milliseconds and (ii) by examining the single trial waveforms. A negative component (N2) covaried in latency with reaction time. These results support the hypothesis that N2 reflects a decision process which controls behavioral responses in sensory discrimination tasks.