. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. S-M CO. â wKw^miMMiiOiiim'^wi i»i»«iiVt>»i«>«> AFTER COND. INH. STIM. (BUZZ.) ^/4j^^*)**^f^/,^<iw^;^v^^ . M^^l'\r4^tf,%U<^WAM AFTER COND. STIM. (T). Fk;. I Contrasting cticcts of'negative' and 'positive" stimuli. During training the following stimuli were presented to this animal: (i) Absolute direct electrical excitation (effects not depicted in this figure). (2) Conditioned or 'positive': a 1600 tone (currently reinforced by i)- (3) Conditioned inhibitory or 'negati
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. S-M CO. â wKw^miMMiiOiiim'^wi i»i»«iiVt>»i«>«> AFTER COND. INH. STIM. (BUZZ.) ^/4j^^*)**^f^/,^<iw^;^v^^ . M^^l'\r4^tf,%U<^WAM AFTER COND. STIM. (T). Fk;. I Contrasting cticcts of'negative' and 'positive" stimuli. During training the following stimuli were presented to this animal: (i) Absolute direct electrical excitation (effects not depicted in this figure). (2) Conditioned or 'positive': a 1600 tone (currently reinforced by i)- (3) Conditioned inhibitory or 'negative': a buzzer (when tone was preceded by buzzer, the former was never reinforced). EEG from sensory motor cortex. Upper line: control. Middle line: repeateci application of buzzer ('negative' excitation) produced a condition that bchaviourally and electrographically resembled sleep; two successive stages are shown (left, right). Lower line: application of tone ('positive' excitation) provoked immediate arousal. Abbreviations: BUZZ., Buzzer; COND., Conditioned; CONT., Control; Inhibitory; Stimulus; T., Tone. Calibration: 100 u v i sec. (unpublished figure from work by Scgundo, Roig and Soinmer- Sniith, 1959).. 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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