. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 5i6 BRAIN MECHANISMS AND LEARNING outside the animal's reach for 2 seconds. The stimukis box was then pushed forward, and the animal was allowed to respond. Thirty trials (fifteen positive and fifteen negative trials) were executed each day until the animal reached a criterion of 90 per cent correct in a one-day session. The EEG was recorded for every trial with a Grass 4-channcl model III machine. The six monkeys learneci a total of fourteen visual discriminations. The plot of percentage of correct respon
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 5i6 BRAIN MECHANISMS AND LEARNING outside the animal's reach for 2 seconds. The stimukis box was then pushed forward, and the animal was allowed to respond. Thirty trials (fifteen positive and fifteen negative trials) were executed each day until the animal reached a criterion of 90 per cent correct in a one-day session. The EEG was recorded for every trial with a Grass 4-channcl model III machine. The six monkeys learneci a total of fourteen visual discriminations. The plot of percentage of correct responses in successive daily sessions showed. Fig. 4 Photograph to show the testing situation. A, monkey in chair, with the black screen around the chair removed to show the electrode wires; B, opaque screen moved to one side to expose the stimulus box; C, the flickering light passing through the box to illuminate the visual stimulus attached to the box frontal panel; D, the photic stnnulator; all controls are operated manually. the typical postively accelerated learning curves. The number of trials ranged from 90 to 180. EEG recordings of eleven discriminations were suitable for analysis. The normal EEG of the visual area showed the fast, low voltage arousal pattern mixed with 4-5 per second relaxation waves. Occasionally there were some alpha-like waves. The temporal leads showed periodical (every 2-3 seconds) bursts of waves (100 (jv. and 12-16 per second) super- imposed on the arousal and relaxation record. These bursts were very. 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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