[Chemoreactive properties of medial thalamic neurons of the rat in the following states: urethane anesthesia, wakefulness and immobilization stress].

An analysis was carried out by means of microelectrode records and microionophoresis of medial thalamus neurones chemical sensitivity to acetylcholine and noradrenaline in rats under urethane anaesthesia, in free behaviour and in immobilization stress. Significant differences were observed in stability of cellular responses to repeated application of mediators under these conditions and in the correlation of the cells with qualitatively different reactions to these mediators. Along with the functional state of the animals, probability and direction of "spontaneous" changes of neuronal chemoreactive properties significantly depended on the type of sensibility inherent in them at that moment.