[Ontogenetic characteristics of the development of homotopic transcallosal responses in the associative and projectional areas of the cat cerebral cortex].
Multiple recordings of homotopical transcallosal responses (TCRs) from the whole dorsolateral surface of both hemispheres have been made in acute experiments on 2-15-day kittens. In sensorimotor and parietal cortex, TCRs were observed from the 2nd day of life, being mainly of a positive-negative form, whereas in the visual and auditory cortex these responses emerged at the 7th day and were presented mainly by a positive oscillation. TCRs in the associative zones (parietal and sensorimotor) were recorded from a relatively greater cortical area than in the projectional zones. On the contrary, foci of maximum activity were usually also located in the associative zones. The latent period of TCRs was longer in the auditory cortical area than in other zones, while positive and negative component peaks were of a longer latency in the auditory and visual cortex as compared to those in the parietal and sensorimotor ones. Interhemispheric asymmetry which was revealed from the moment of response emergence and exhibited an individual pattern, was observed in TCRs recorded in associative and projectional zones. The data obtained suggest that in 2-15-day kittens, functional development of the callosal system in the associative area takes place earlier than that in the projectional zones.
D000375:Aging / Q000502:physiology*; D000818:Animals; D000831:Animals, Newborn; D002415:Cats; D002540:Cerebral Cortex / Q000502:physiology*; D003337:Corpus Callosum / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology; D004558:Electric Stimulation; D013997:Time Factors
Ontogeneticheskie osobennosti razvitiia gomotopicheskikh transkallozal'nykh otvetov assotsiativnykh i proektsionnykh oblasteĭ kory golovnogo mozga koshki.