. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. io8 BRAIN MECHANISMS AND LEARNING same manner as was assumed by Lorente de No (1934, 1938) and his followers for the activity of the central nervous system in general. In any case, there are sufficient grounds for this assumption during the stage of formation of conditioned reflexes and for the initial period of their func- tioning. Subsequently, depending on a number of circumstances, evolu- tionary development leads to different results: to the inhibition of both conditioned connections, to the inhibitio
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. io8 BRAIN MECHANISMS AND LEARNING same manner as was assumed by Lorente de No (1934, 1938) and his followers for the activity of the central nervous system in general. In any case, there are sufficient grounds for this assumption during the stage of formation of conditioned reflexes and for the initial period of their func- tioning. Subsequently, depending on a number of circumstances, evolu- tionary development leads to different results: to the inhibition of both conditioned connections, to the inhibition of one of them, and some- times to the preservation of both connections in a state of stability and efficiency. In this case a usual one-way conditioned coiuiection can be regarded as a derivative of a double conditioned connection, as resulting from the subsequent inhibition of one of the paired Fig. 8 Schematic representation of a conditioned reflex arc. I should like also to point out that all the factual material described in this communication, as well as the appraisal of its scientific significance, may also be regarded as corroborating the proposition we advanced many years ago, that the primary conditioned reflex results from the synthesis of combined inborn reflexes evoked by both unconditioned and 'in- different' stimuli (Fig. 8). Of course, at present, we arc far from a satisfactory interpretation ot these facts. Nevertheless, some purely hypothetical statements can be made. In particular, we are inclined to believe that the elaboration of a double conditioned connection may be accounted for by the relative equality of intensity of the excitations which arise in the corresponding central nervous structures under the influence of the combined stimuli. It goes. 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 res
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