[The neuronal activity of suspension grafts of the neocortex].

Were compared electrophysiological characteristics of suspension (SUS) and solid (SOL) tissue grafts of embryonic neocortex transplanted into the barrel field of adult rats. The level of survival of SUS and SOL grafts did not differ significantly (89% and 95% correspondingly). All SUS grafts were integrated with the host brain judging by histological and electrophysiological criteria. Reactivity of neurons to electrical stimulation of the recipient's brain and to sensory (tactile) stimulation, as well as the latencies of on-responses were similar in both types of the grafts. However, proportion of neurons with on-responses was nearly twice lower in SUS grafts, while the number of neurons responding to tactile stimulation by primary suppression of activity was significantly higher than in SOL ones. It is suggested that the derangement of primary architectonics unavoidable during preparation of suspensions is responsible for the described differences between SUS and SOL grafts.