. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. Fig. I Electroencephalogram of an unanacsthetized rabbit 24 hours (A) and 3 days (B) after produc- tion of an ethyl chloride lesion. The site and extent of the lesion is indicated by the cross hatched area on the diagram. Derivations are bipolar from implanted electrodes over the indicated regions. Calibration is 50 microvolts and i second. After a given period of time (24 hours to 7 days in the rabbit, 4 weeks to 3 months in the cat; about 8 weeks in the monkey) the secondary contra- lateral focus becomes
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. Fig. I Electroencephalogram of an unanacsthetized rabbit 24 hours (A) and 3 days (B) after produc- tion of an ethyl chloride lesion. The site and extent of the lesion is indicated by the cross hatched area on the diagram. Derivations are bipolar from implanted electrodes over the indicated regions. Calibration is 50 microvolts and i second. After a given period of time (24 hours to 7 days in the rabbit, 4 weeks to 3 months in the cat; about 8 weeks in the monkey) the secondary contra- lateral focus becomes independent in that it does not disappear upon ablation or coagulation of the prmiary region of discharge. Electro- graphically, the independent stage of homotopic discharge is characterized by random spikes and paroxysmal bursts which bear no relation in time to the activity present in the primary lesion (Fig. 3).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Council for International Organizations of Medical Sciences; Fessard, A. (Alfred); Delafresnaye, J. F. (Jean Francisque), 1919-. Springfield, Ill. , Thomas
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