. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. Fig. 12 'opposite' effects of differentiated tones, a tone of 1600 (but not one of 160 ) was reinforced by cessation of SS. Eventually, differentiation ensued (see and Fig. 11). Reinforced tones (1600 — CESS. SS) masked large control evoked potentials; non-reinforced tones (160 DIFF.) augmented small control potentials. Specificity of effects described above was explored from different points of view. I. Frequency specificity. When a cat had been trained to respond to a tone of a given f
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. Fig. 12 'opposite' effects of differentiated tones, a tone of 1600 (but not one of 160 ) was reinforced by cessation of SS. Eventually, differentiation ensued (see and Fig. 11). Reinforced tones (1600 — CESS. SS) masked large control evoked potentials; non-reinforced tones (160 DIFF.) augmented small control potentials. Specificity of effects described above was explored from different points of view. I. Frequency specificity. When a cat had been trained to respond to a tone of a given frequency ( ) habitually 'reinforced' by cessation of SS, the first applications of a different frec]ucncy ( 160 ) provoked a smiilar effect (generalization) (Fig. 11 — I, and A). After a number of sessions in which one tone (1600 ) but not the other (160 ) was reinforced by substraction of SS, three cats out of four, reached a point in which effects were produced consistently by 1600 and exceptionally by 160 (differentiation) (Fig. 11 — I-b, B). In this situation, it occurred frequently that small cortical responses (not modified by the 'positive' tone) were augmented by application of the 'negative' tone (Fig. 12).. 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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