Functional organization of local neural networks in the cat neocortex. Relationship to the level of food motivation.
Implanted semimicroelectrodes were used to record multineuron activity--spike discharges from groups of close-lying neurons--in the deep layers of the frontal and motor cortex in conscious cats with different levels of food motivation. Spike activity from 4-7 neurons was extracted from multineuron activity, and interneuron interactions were studied by cross-correlation analysis. Neurons in local networks were divided into two subgroups: neurons with high-amplitude spikes with a predominance of output (divergent) connections, and neurons with low-amplitude spikes and a predominance of input (convergent) connections. Food deprivation lasting 24 h affected mainly the nature of interneuron interactions in the range of late cross-correlational connections (with delays of 2-100 msec).
Dolbakyan
E E
EE
Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow.
Merzhanova GKh
D000818:Animals; D002415:Cats; D048429:Cell Size; D004566:Electrodes; D005502:Food; D005508:Food Deprivation; D009042:Motivation; D009044:Motor Cortex / Q000502:physiology; D019579:Neocortex / Q000502:physiology*; D009415:Nerve Net / Q000502:physiology*; D017397:Prefrontal Cortex / Q000502:physiology; D013569:Synapses / Q000502:physiology