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G A Taran

Publications and source records attributed to G A Taran.

5 recordsLinked to original sources
PubMed1977

[Responses of neurons in the secondary somatosensory zone of the cat cortex during elaboration of a defensive conditioned reflex].

The neuronal responses of the somatosensory secondary cortex during the process of formation and extinction of a conditioned defence reflex to sound stimulus were studied in chronic experimentss on cats. In 21 out of 28 examined neurons a change in activity took place during the formation of a conditioned reflex as a response to the conditional signal. Two types of conditioned reflex responses were observed: excitatory and inhibitory ones. Most of the neurons excited by the conditioned stimulus responded during the first 50 ms, preceding the conditioned movement by 80-100 ms. Significant variability of neuronal responses was observed during formation of the conditioned reflex. After stabilization the neuronal responses to the conditioned stimulus acquired a stable from. During extinction of the neuronal conditioned activity a decrease of the discharge frequency in the excitatory neuronal response and disinhibition of the activity in the inhibitory responses were found.

Animals↗
PubMed1977

[Reactions of neurons of the secondary somatosensory cortex of awake cats to electrocutaneous and acoustic stimulation].

In chronic experiments on alert cats the discharges of neurons in the secondary projection zone of the somato-sensory cortex to click and electrical stimulation of contralateral paw were investigated. 57% of neurons responded to "specific" stimulation by increasing the discharge frequency, 18%--by weakening or stopping the background activity, while 25% did not react at all. 30% of neurons responded by activation to the "non-specific" stimulation (click), 25%--by inhibition and 45% were unresponsive. An investigation of intersensory convergence by sending signals from different analyzer systems showed that bimodal responses are peculiar to most neurons (55%) of this zone. 18% of neurons with a response only to the "specific" or "non-specific" stimuli were found. It is suggested that polysensory convergence on the neurones of the somato-sensory cortex is important for the cortical area in the process of closing of conditioned connections.

Animals↗