[Neuronal correlates of the cyclicity of the recruiting response]

The majority of neurons belonging to different levels of the thalamo-cortical unspecific system: anterior ventral thalamic nucleus (59%) and sensomotor cortical area (75%), were involved into cyclic activity of the recruiting reaction evoked by low-frequency stimulation of the central medial thalamic nucleus. The course of involvement differed in different neurons and was manifested by regular changes of firing rate or spindles, as well as by intervals between the spindles. Neuronal correlates of recruiting reaction cycling were stable and persisted even in changes of the neuronal spontaneous activity. The results indicate a possible significance of functional interaction of different neuronal groups involved in the recruiting reaction, for organization of the slow cycle of the thalamo-cortical nonspecific system's activity.