. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 6i8 BRAIN MECHANISMS AND LEARNING The presence ot the tone at the beginning of the period of darkness, the flicker-tone association, provoked modifications comparable to the tone-flicker association, but inconstant and less important (Fig. 9). In /. 8 iO 11 t h Fig. 9 Chaii^Ci ot the I'Isiuil evoked response by effecl of fliiker-toiie iissocicUioii. Stroboscope at 3 m. from the retina. Eyes open. Forty superimposed sweeps. Lead 03-right mastoid, 10/20 system. Arrows indicate the stimulus. Discontinuou
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 6i8 BRAIN MECHANISMS AND LEARNING The presence ot the tone at the beginning of the period of darkness, the flicker-tone association, provoked modifications comparable to the tone-flicker association, but inconstant and less important (Fig. 9). In /. 8 iO 11 t h Fig. 9 Chaii^Ci ot the I'Isiuil evoked response by effecl of fliiker-toiie iissocicUioii. Stroboscope at 3 m. from the retina. Eyes open. Forty superimposed sweeps. Lead 03-right mastoid, 10/20 system. Arrows indicate the stimulus. Discontinuous flicker frequency 2/sec. during 20 seconds, interrupted during 20 seconds, (i) control without stimulation; (2) habituation to discontinuous flicker frequency after ten trials without association with tone; (3-12) successive trials with flicker (20 seconds) — tone (10 seconds) — darkness (10 seconds) association; (3) ist trial with flicker-tone association, no appreciable modifications with respect to previous trial are noted; (4) 6th trial, the response is considerably increased; (5-7) 7th, 9th and loth trials respectively, response again decreases; (8-11) nth, i6th, 21 St and 29th trials respectively, an increase takes place and is maintained; (12) 31st trial, decreases again. Calibration, 200 msec. some experiments the central response underwent remarkable changes whereas the occipital one did not show significant variations (Fig. lo). The dishabituation obtained by the tone-flicker or flicker-tone associa- tions persisted during various trials when these stimuli were substituted by a. 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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