. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 552 BRAIN MECHANISMS AND LEARNING (CRs) ill dogs, and our results are in many respects similar to those obtained by Dr Buser, it would be relevant to summarize them at this point. The general method of our experiments was such, that we trained the animals to perform a motor act consisting in lifting the right foreleg and putting it on the food-tray to given conditioned stimuli (CSs); each such movement pertormed to a CS was reinforced by food. After the motor CR was firmly established, particular parts of
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 552 BRAIN MECHANISMS AND LEARNING (CRs) ill dogs, and our results are in many respects similar to those obtained by Dr Buser, it would be relevant to summarize them at this point. The general method of our experiments was such, that we trained the animals to perform a motor act consisting in lifting the right foreleg and putting it on the food-tray to given conditioned stimuli (CSs); each such movement pertormed to a CS was reinforced by food. After the motor CR was firmly established, particular parts of the scnsori-motor cortex, or the whole of it, were removed and the effects of these lesions examined. I shall speak here only on the results of bilateral Fig. I The dorsal and lateral surface of the cerebral cortex of dog represented on the plan. I, sensory cortex; II, motor cortex; III, pre-motor cortex, a, sulcus ansatus; c, sulcus centralis; cr, sulcus cruciatus; pr, sulcus prcsylvius. \n the course of our study it appeared to be useful to divide the scnsori-motor cortex into three roughly parallel belts (Fig. i): i. 'sensory cortex', situated be- tween the line of sulcus ansatus and of sulcus centralis and corresponding to the zone described recently by Hamuy, Broniiley and Woolsey; 2. 'motor cortex', situated between the line of sulcus centralis and of sulcus cruciatus; 3. 'premotor cortex', situated between sulcus cruciatus and its prolongation and sulcus pres)'lvius. After ablation of the first strip — sensory area — the instrumental CR is lost for several weeks, but the general behaviour of the animal is quite adequate, and he reacts correctly to CSs, although he seems unable to perform the trained movement. After some time the instrumental reaction returns without additional training (Stepieii and Stepieii, 1959).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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