Abstract
The long-term changes in the averaged evoked potentials (AEPs) recorded from the visual cortex on photic stimulation after X-irradiation were studied in 4 adult male rabbits with permanently implanted electrodes. Doses of 300 R were administered to the brain. The AEPs consisted of five wave components in the first 400 msec and the after discharges (ADs) which were sequence of several deflections lasting about 900 msec after stimulation. The amplitude of some of the early three components of the AEPs in 2 of the 4 animals decreased significantly after exposure. The late two components in all but 1 of the 4 animals gradually decreased in amplitude in the course of time after exposure, with individual variations as to degree. The amplitude of these two components of the remaining animal decreased slightly but significantly throughout the observation period. The peak latency of some of the five components in 2 out of the 4 animals showed a significant decrease after exposure. The changes in the amplitude and peak latency of all of the components of the ADs after exposure differed from animal to animal. The amplitude of the electrocorticograms of the sleep stage recorded from the visual cortex in 3 of the 4 animals decreased slightly several months before death. All 4 animals died between 300 and 799 days after exposure.
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