Experiments on unrestrained dogs performed by the alimentary method showed that extirpation of the parietal cortex (field P) does not affect the previously elaborated and well stabilized conditioned reflexes to time, their reversal and temporal differentiation. The operated dogs retain their ability for relative perception of temporal intervals. Switching over of conditioned reflexes to time is disturbed. The conditioned reflexes to successive complex stimuli with simultaneous differentiation of their components are disturbed for a long time (up to seven months). Less disturbed are the conditioned reflexes to a simultaneous polysensory complex with parallel extinction of their components (within one month after the operation). An assumption has been made that the parietal zone of the cerebral cortex plays an important part in the mechanism providing for successive connections.

Animals↗

PubMedDate not supplied

[Effect of the destruction of the entorhinal region of the cortex on the conditioned reflex activity of animals].

A study was made of the influence of ablation of the entorhinal cortex on conditioned reflexes to present and trace stimuli. Ablation resulted in a long-lasting and considerable disturbance of differentiation of time macrointervals. After the operation, elaboration or restoration of the conditioned reflex to time was delayed five or six times as compared with intact animals. There was no change in the state of motor alimentary conditioned reflex to different (single or complex) present stimuli regardless of whether the ablation was performed after or before the elaboration of conditioned reflexes. Similar results were obtained in animals of different phylogenetic groups (rats and dogs).

Animals↗