Evoked-Potential Correlates of Stimulus Uncertainty

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Science  26 Nov 1965:
Vol. 150, Issue 3700, pp. 1187-1188
DOI: 10.1126/science.150.3700.1187


The average evoked-potential waveforms to sound and light stimuli recorded from scalp in awake human subjects show differences as a function of the subject's degree of uncertainty with respect to the sensory modality of the stimulus to be presented. Differences are also found in the evoked potential as a function of whether or not the sensorymodality of the stimulus was anticipated correctly. The major waveform alteration is in the amplitude of a positive-going component which reaches peak amplitude at about 300 milliseconds.

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