BIO-INFORMATION PROCESSINGS OF THE ELECTROENCEPHALOGRAPHIC MASSPOTENTIALS IN ANIMAL AND MAN.
Final rept. 5 May 66-4 May 67,
NAGASAKI UNIV (JAPAN) DEPT OF PHYSIOLOGY
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Bio-information processings of the brain masspotentials of man, monkey, cat and rabbit, which were recorded on magnetic tapes, were carried out through General Purpose Digital Computers. Evidences were found to suggest that man and animal brains operate their bio-information processing through normal Gaussian stochastic processes, at least for the first approximation. Late responses in the visual evoked potential of cerebral cortex of man, monkey, cat and rabbit were also manifested as related to stages of background EEG activities shown in their autocorrelograms. It was found that peak latencies of later responses of cerebral palsy children were reduced compared with those of normal children, and those of later oscillatory potentials of rabbit also abbreviated progressively with lowering background EEG activities, though those of initial oscillatory potentials were elongated more and more. The former evidences may suggest impaired negative feed back action, such as recurrent inhibition. Alpha, beta, theta and delta waves in EEG were simulated by repetitive summation of an evoked potential elicited by a single flash stimulus with the same repetitive frequencies as each of the above EEG waves. This finding suggests that the EEG generating mechanism would be a masspotential due to changes in membrane potentials of cerebral neurone aggregates elicited by enumerable afferent trains of impulses. Author
- Anatomy and Physiology