Electrocorticographic Changes in the Rabbit during and after Fractionated X-irradiation

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The effects of fractionated X-irradiation on the spontaneous electrical activity in the visual cortex were studied in four adult male rabbits with permanently implanted electrodes. Two of the rabbits received a dose of 300R and two a dose of 1500R, fractionated into 50 and 150R per day administered at semi-weekly intervals. The head, except for the region of brain, was shielded with a lead plate. The electrical activity was averaged with a CAT 400 B. The obtained averaged electrocorticograms were classified into seven waves:δ_2, δ_1, θ, α, β_1, β_2 and β_3 by means of an EEG frequency analyzer. The amplitude of the δ_2, δ_2, θ, α and β_1 waves of the two animals irradiated with 1,500 R gradually decreased with increasing doses during fractionated X-irradiation. The decreased value remained relatively constant throughout the observation period after the end of exposure. The two animals irradiated with 300 R did not show any definite changes in amplitude during and after fractionated irradiation. The results are discussed in reference to the findings of the previous study using photic stimulation.
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