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• W2069776031 abstract "Abstract Distinct neuronal subsets were identified by microelectrode recordings taken from the hindpaw focus of sensorimotor cerebral cortex of cats anesthetized with chloralose. The hindpaw focus was located squarely within cytoarchitectonic field 3b of primary somatosensory (SmI) cortex. The population of neurons within this region was similar to that found in the primary motor (MsI) cortex forepaw focus of field 4γ, but different from that in the forepaw focus of field 3b. The vast majority of the neurons isolated (98.5%) were identified either as small-field (sa) neurons or widefield (m) neurons; the others were either sb or sc neurons. The population response patterns of the sa and m neurons were studied, and found to be very similar to those of sa and m neurons in forelimb sensorimotor cortex. For each neuronal subset, spike density distributions were constructed as a joint function of time, following 1/sec electrical shocks to the central footpads, and depth within the cortex. The population response patterns of the two subsets were strikingly different. Following stimulation of the contralateral hindpaw, the sa neuron activity reached a maximum 16.0 msec after the stimulus, at a depth of 0.6 mm below the pial surface; the m neuron activity peaked 4 msec later and 0.4 mm deeper. The response profiles of the m neurons produced by stimulation of the other three (off-focus) paws were all similar to one another, but were shifted relative to each other in time; these patterns showed much greater temporal dispersion than the pattern produced by contralateral hindpaw stimulation. All the off-focus m neuron profiles showed a small, early peak of activity deep within the cortex, and a larger, later peak at intermediate depths. The population response patterns of both neuronal subsets are discussed as possible substrates for encoding information about various stimulus properties; it is argued that the sa neurons are much better suited to encode stimulus location than the m neurons. The temporal relationship between the time courses of activity of the sa and m neurons and the concomitant surface primary response was similar to that obtained for sa and m neurons within forepaw tissue. The interconnections between thalamus and cortex and among the different subsets of cerebral neurons, as deduced from study of the postcruciate forepaw focus (field 4γ), were found to be applicable to the hindpaw focus (field 3b) as well. It is argued that cytoarchitectonic field 3b is probably not devoted to a single function that might be characterized as sensory or motor." @default.
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• W2069776031 date "1976-11-01" @default.
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• W2069776031 title "Population response patterns of distinct neuronal subsets in hindlimb sensorimotor cerebral cortex of the domestic cat" @default.
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• W2069776031 doi "https://doi.org/10.1016/0014-4886(76)90091-1" @default.
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