. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 570 BRAIN MECHANISMS AND LEARNING fact that, according to Rosvold and Mishkin, it is not observed when the instru- mental reaction to the inhibitory stimukis is punished, speak against this supposition and support the view that perhaps we have to do here with the impairment of the inhibitory processes themselves. Therefore, we must consider the question of what sort of inhibition is affected by prefrontal lesions and in which way it is affected. Here we must inevitably revert to the classical Pavlovian not
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 570 BRAIN MECHANISMS AND LEARNING fact that, according to Rosvold and Mishkin, it is not observed when the instru- mental reaction to the inhibitory stimukis is punished, speak against this supposition and support the view that perhaps we have to do here with the impairment of the inhibitory processes themselves. Therefore, we must consider the question of what sort of inhibition is affected by prefrontal lesions and in which way it is affected. Here we must inevitably revert to the classical Pavlovian notions of external and. .before prefrontal lobectomy — after prefrontal lobectomy — Fig. s Examples ot disinhibition of salivary food conditioned reflexes after prefrontal ablations. Each graph represents the voluminograph of salivation to a positive conditioned stimulus and to an inhibitory stimulus following it. Note that after prefrontal lobectomy positive CRs are unchanged, while negative ones are more or less disinhibited (After Brutkowski, 1957)- internal inhibition and to the immense experimental evidence on which these notions are based. It is quite clear that what is impaired after a prefrontal lesion is only internal (or conditioned in the wider sense of the word) inhibition, wliile external ( antagonistic) inhibition is not affected at all or may even be increased after this lesion. For our further analysis we shall accept here, as a working hypothesis, a concep- tion put forward some time ago by Konorski (1948), according to which internal inhibition is based on the formation of inhibitory connections between the central. 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), 1
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