Visually evoked cortical potentials to patterned stimuli in monkey and man
article
Scalp responses evoked by patterned visual stimuli and by changes in luminance were recorded both from human subjects and monkeys. Three models are proposed to explain the observed stimulus response relations: luminance detection by first order summing units; a centre surround antagonistic mechanism which enhances responses to spatial patterning; and contour detection by ordered arrays of overlapping receptive fields. Implications of the three hypotheses are discussed. Experimental evidence is presented which shows that a definite contour specific response component can be observed in most human subjects. Spatial frequency selectivity by centre surround antagonism seems the most plausible explanation of the results in monkey. The differences between human and monkey stimulus response relationships are tentatively explained by the differences in cortical architecture, assuming the origin of spatial frequency selectivity in striate cortex and, in accordance with Michael & Halliday and Jeffreys, a mainly extrastriate origin of the specific contour response.
Topics
TNO Identifier
4437
Source
Electroencephalography Clinical Neurophysiology, 35, pp. 153-163.
Pages
153-163
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