PMID: 2495920Mar 1, 1989Paper

Event related brain potentials and signal detection: decision confidence and signal probability

EEG-EMG Zeitschrift für Elektroenzephalographie, Elektromyographie und verwandte Gebiete
T F MünteM Scholz

Abstract

This paper is concerned with the relation of two components of the late positive complex, P300 and slow wave, to parameters of signal detection theory. In the first experiment, basically a replication of Squires et al., signal probability was 50% and a six point rating scale was used for subjects' answers. Whereas for the P300 the well known relation to subjective confidence (and thus to response criteria) was confirmed, a similar relation could not be found for the slow wave. In the second experiment the local signal probability was varied from 25% to 75% on a trial to trial basis. Under these conditions neither the P300 nor the slow wave exhibited a relation to signal-probability, whilst the relation to decision-confidence was preserved.

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