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Responses of the reticular nucleus neurons and dorsal thalamic nuclei neurons in cat during extinction of the conditioned instrumental reflex



Responses of the reticular nucleus neurons and dorsal thalamic nuclei neurons in cat during extinction of the conditioned instrumental reflex



Neirofiziologiya 23(1): 3-8



Activity of 66 neurons of the reticular nucleus (R), 31 neurons of the ventroposterolateral nucleus and 14 neurons of the posterolateral nucleus-pulvinar complex of the thalamus was investigated during extinction of the conditioned instrumental alimentary reflex. The quantity of R neurons that show initial excitation in response to the conditonal stimulus in the first 300 ms decreased during extinction. Conditioned placing reactions and late excitatory and inhibitory neuronal responses in the R and dorsal thalamic nuclei with latency above 300 ms disappeared during extinction simultaneously. The background unit activity decreased during extinction in the 2/3 of investigated neurons of R and dorsal thalamic nuclei. It is suggested that the efferent influence from the R decreased during extinction.

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