[Spatial distribution and response interaction in the receptive fields of lateral geniculate body neurons in the cat]. / Issledovanie prostranstvennogo raspredeleniia i vzaimodeistviia reaktsii v retseptivnykh poliakh neironov naruzhnogo kolenchatogo tela koshki.

A detailed comparison of responses of lateral geniculate neurons to local photic stimulation of central, antagonistic and disinhibiting zones of their receptive fields (RF) during local light adaptation of each zone was carried out in experiments on unanesthetized cats immobilized with d-tubocurarine. It was shown that most conditions of local adaptation of different RF zones activated neuronal on- and off-responses to stimulation of peripheral zones and depressed responses to flashes delivered to the central zone. Therefore under condition of local adaptation the geniculate neurons can produce intensive signals when photic stimulation switches on as well as switches off. The comparison of this fact with the known properties of on-off-channels allows suggesting that under condition of light adaptation the processing of large information volumes and more perfect performance of visual functions are connected with emergence of signals in different RF zones.

[Several mechanisms of acetylcholine participation in the processes of formation and fixation of temporary connections]. / O nekotorykh mekhanizmakh uchastiia atsetilkholina v protsessakh formirovaniia i fiksatsii vremennykh sviazei.

Microphoretic application of acetylcholine (ACH) to the neurones of the rabbit sensorimotor cortex elicits changes of spontaneous and evoked activity which do not correlate with one another and which persist up to two minutes after the end of ACH application. Following the formation of a defensive conditioned reflex to sound, the reactions to ACH in units involved in the formation of the temporary connection are intensified as compared with their reactions before conditioning and with reactions of those neurones which did not elaborate a temporary connection. The possible mechanisms of ACH participation in the processes of elaboration and fixation of temporary connections are discussed.