. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 382 BRAIN MECHANISMS AND LEARNING a tracheotomy was performed under ether anaesthesia and the animal placed on flaxedil and artificial respiration. Local anaesthesia was used for the scalp incision, the hemispheres were widely exposed and the pia arachnoid covered with warm mineral oil. At the end of the experiment the isolated regions were serially sectioned to confirm the completeness of loss of neural continuity. The pial circulation was, of course, preserved intact in these preparations. The appearance
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 382 BRAIN MECHANISMS AND LEARNING a tracheotomy was performed under ether anaesthesia and the animal placed on flaxedil and artificial respiration. Local anaesthesia was used for the scalp incision, the hemispheres were widely exposed and the pia arachnoid covered with warm mineral oil. At the end of the experiment the isolated regions were serially sectioned to confirm the completeness of loss of neural continuity. The pial circulation was, of course, preserved intact in these preparations. The appearance of the whole brain at autopsy, as well as a cross section through the isolated region, are indicated in Fig. Fig. 7 Whole brain at autopsy and cross section through tlie isolated regions. The defect in tlie right frontal pole was produced in the course of removal of the brain at autopsy. Gross electrodes were placed upon the surface of the isolated mirror region and adjacent surrounding cortex and one to four tungsten micro- electrodes (Hubel, 1957) were inserted into the isolated slab at a depth of 500 to 1000 micra. Search for spontaneously firing units was rarely successful so that one had to rely upon multiple placement at a depth where unit discharge might reasonably be expected in connection with surface electrographic paroxysms. A pledget of metrazol placed upon adjacent normal cortex elicited a seizure discharge which slowly spread. 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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