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Contribution of specific and nonspecific afferent inputs to shaping evoked potentials produced in the cat brain by photic stimulation

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Abstract

Acute and chronic experiments on cats served to show that generation of evoked potentials continued in both the cortex and a number of subcortical structures and that these contained a component matching initial response (except in its reduced amplitude) even after cutting off specific pathways for visual impulse access. This involved severing the optic tract prior to its entry into the lateral geniculate body. Amplitude of primary response decreased less sharply after coagulating the lateral geniculate body, thus preserving a proportion of nonspecific impulse transmission (with pathways via the retino-collicular fibers persisting). Once a major proportion of the nonspecific visual pathways had been destroyed by severing the brachium of the superior colliculi, photic stimulation led to the formation of two-stage evoked potentials with a profile hardly differing from normal. It is presumed that genesis of evoked potentials depends on the quantity rather than the quality of incoming afferents.

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Authors
  1. V. V. Lavrov
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Additional information

I. V. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. Translated from Neirofiziologiya, Vol. 20, No. 1, pp. 3–7, January–February, 1988.

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Lavrov, V.V. Contribution of specific and nonspecific afferent inputs to shaping evoked potentials produced in the cat brain by photic stimulation. Neurophysiology 20, 1–4 (1988). https://doi.org/10.1007/BF02198417

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  • DOI: https://doi.org/10.1007/BF02198417

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