Area-luminance effects and the visual evoked brain response

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Psychophysical and electrophysiological studies report that luminance must be systematically increased as stimulus area is decreased if a constant response is to be elicited. The visual evoked brain response (VEBR) was recorded from three human subjects as a function of eight stimulus intensities for five different areas. The results indicate: (a) the amplitude of the B-C component of the VEBR increases in a linear fashion as a function of increases in log luminance, (b) there is a linear reciprocal relationship between the magnitude of log area and log luminance for targets up to 10 deg, and (c) substituting total number of receptors in an area for stimulus size results in receptor-luminance functions identical to the corresponding area-luminance function. Results are discussed in terms of neural summation. © 1975 Psychonomic Society, Inc.

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