The properties and possible mechanisms of interhemisphere synchronization in the motor cortex of the rat.
Cross-correlation analysis was used to observe interhemisphere synchronization of motor cortex neuron activity in anesthetized rats, which was seen on cross-correlograms as peaks located symmetrically relative to the coordinate origin. Peaks included "narrow" peaks (less than 20 msec) and "intermediate" peaks (30-80 msec). The results showed that the "common" source synchronizing the discharges of pairs of neurons located in different hemispheres of the brain might be a neuron (or group of neurons) located in one of the hemispheres and playing this role when there were reciprocal excitatory connections between it and each neuron in a pair. Comparison of the widths of symmetrical peaks with latent periods corresponding to transcallosal connections suggested that mono- and polysynaptic connections underlie the formation of "narrow" and "intermediate" peaks respectively.
Sil'kis
I G
IG
Neurophysiology Laboratory, Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow.
Bogdanova
O G
OG
D000818:Animals; D003337:Corpus Callosum / Q000166:cytology / Q000502:physiology; D003344:Cortical Synchronization; D004558:Electric Stimulation; D007839:Functional Laterality / Q000502:physiology*; D007395:Interneurons / Q000502:physiology; D008297:Male; D008839:Microelectrodes; D009044:Motor Cortex / Q000166:cytology / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D051381:Rats; D013569:Synapses / Q000502:physiology