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Thalamocortical projection system in motor-defensive reflexes

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Abstract

Chronic experiments on five dogs showed that preliminary bilateral lesions of the thalamic posteroventral nuclei (VP) and partial lesions in the posterior nuclear group of the thalamus increased the time required to form a stable postural response; sharply reduced (to 25–30% of all responses) the total “avoidance” level of the current, i. e., the production level of a correct postural response; and strengthened the defensive (phasic) reflex component. If the same thalamic zones were destroyed after preliminary formation and stabilization of motor defensive reflexes associated with maintenance of a certain posture, no marked changes were produced in these reflexes. To analyze the results the somatosensory cortical areas were stimulated through preliminarily implanted electrodes in a group of animals and areas S1 and S2 were removed from one experimental animal.

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Authors and Affiliations

  1. Laboratory of Higher Nervous Activity of Animals, Pavlov Institute of Physiology, USSR Academy of Sciences, Leningrad

    K. B. Shapovalova

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  1. K. B. Shapovalova
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Shapovalova, K.B. Thalamocortical projection system in motor-defensive reflexes. Neurosci Behav Physiol 5, 177–186 (1972). https://doi.org/10.1007/BF01184627

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