. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 3 .?. ^^*SK Fig. 4 Responses o( Monkey 1, enlarged from a 16 mm. colour film which was taken through a one-way mirror. Left and centre: conditioned flexions of right forearm to CS at left occipital cortex. The slight inclination of the head to the right, which also imitates a movement of the UR, was sometimes seen with high intensities of the CS before conditioning was begun and hence cannot accurately be considered a part of the CR, although its consistency and tiireshold of elicitation may have been alte
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 3 .?. ^^*SK Fig. 4 Responses o( Monkey 1, enlarged from a 16 mm. colour film which was taken through a one-way mirror. Left and centre: conditioned flexions of right forearm to CS at left occipital cortex. The slight inclination of the head to the right, which also imitates a movement of the UR, was sometimes seen with high intensities of the CS before conditioning was begun and hence cannot accurately be considered a part of the CR, although its consistency and tiireshold of elicitation may have been altered by the conditioning procedure. The CS and US signal lights were used only during photography. Ri^ilit: unconditioned response to stimulation of left precentral cortex. Note similarity of end point of this response to that obtained by Dclgado from stimulation of the rhinal fissure (Delgado, 1959, Fig. i top). In ninety-one presentations of the CS given in five sessions without the US this CR was elicited fifty-six times. One-minute intervals were frequently employed. In two sessions after repeated presentations of the CS without the US, the CR was absent for five or more consecutive trials. The head and eye movements evoked by the CS were still present during this period of extinction. On several occasions it was noted, how- ever, that the eyes closed at the onset of the CS and the animal appeared to drowse even though the eyes could be seen moving beneath the lids. Stimulation with an electrode pair within 1-} mm. of those used as CS gave no eye movements if the polarity of the stimulus was negative for the electrode separated from the others by a small sulcus. None the less the. 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. (Alfr
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