A metric for thought: a comparison of P300 latency and reaction time

Science  02 Jan 1981:
Vol. 211, Issue 4477, pp. 77-80
DOI: 10.1126/science.7444452


We confirm that the latency of the P300 component of the human event-related potential is determined by processes involved in stimulus evaluation and categorization and is relatively independent of response selection and execution. Stimulus discriminability and stimulus-response compatibility were manipulated independently in an "additive-factors" design. Choice reaction time and P300 latency were obtained simultaneously for each trial. Although reaction time was affected by both discriminability and stimulus-response compatibility, P300 latency was affected only by stimulus discriminability.

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