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- W2079631179 abstract "Additional data are offered bearing on the controversy initiated by the report of Clark, Butler, and Rosner [(1969) J. Comp. Physiol. Psychol. 68 , 315–319] of dissociation between psychological responses and evoked potential data when subjects are performing psychophysical tasks in a semi-anesthetized state. Following a critique by Donchin and Sutton [(1970) Commun. Behav. Biol. 5 , 111–114], Clark, Butler, and Rosner [(1970) Commun. Behav. Biol. 5 , 105–110] repeated their experiment with a few modifications and reported essentially the same results. The present authors point out the inadequacy of the repeated design in controlling for attentive factors and cite their own experimental evidence for the crucial role of focused attention in psychophysical tasks. A series of experiments is described which demonstrate the close correspondence between the P 3 component of the average evoked response and perceptual behavior in psychophysical tasks involving near-threshold stimuli. However, this relationship appears only when the behavioral measures do not pool or confuse a subject's sensitivity to physical parameters of stimulation and the response criterion he adopts in making his decisions. Whereas Clark, Butler and Rosner relied on the traditional measurement of the threshold, which is a global indicator of correct responses but fails to take into account differences in response bias, the present study was based on Signal Detection Theory, which allows the quantitative assessment of nonstimulus variables. It is shown that the P 3 component of the average evoked potential bears a linear relationship to both sensitivity and criterion measures, whereas the same data, plotted as percentage of correct responses, do not relate in any meaningful fashion to P 3 amplitude." @default.
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- W2079631179 title "Evoked potential correlates of psychophysical judgments: The threshold problem. A new reply to Clark, Butler, and Rosner" @default.
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- W2079631179 doi "https://doi.org/10.1016/s0091-6773(73)80062-8" @default.
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