. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. M. R. COVIAN, C. TIMO-IARIA AND R. F. MARSEILLAN 435 arc shown in Fig. i. At the end of the experiment an electrolytic lesion was made in the brain stem reticular formation with a direct current ot 2-3 mA during 15 sec. The animal's head was perfused with formalin through one carotid artery and electrode position was later determined from serial sections stained by Toluidine blue. RESULTS The stimulation of the right forepaw evoked (Fig. 2) the characteristic surface positive-negative primary responses in
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. M. R. COVIAN, C. TIMO-IARIA AND R. F. MARSEILLAN 435 arc shown in Fig. i. At the end of the experiment an electrolytic lesion was made in the brain stem reticular formation with a direct current ot 2-3 mA during 15 sec. The animal's head was perfused with formalin through one carotid artery and electrode position was later determined from serial sections stained by Toluidine blue. RESULTS The stimulation of the right forepaw evoked (Fig. 2) the characteristic surface positive-negative primary responses in the corresponding area of the somatosensory cortex. With previous stimulation of the brain stem. Fig. 2 Cortical evoked potential in somatosensory area by tactile stimulation. Time 200 cps. Calibration: see uV — same calibration for all other records. reticular formation at 100 msec, interval and volts, the negative com- ponent disappeared and a slight reduction of the positive one was observed (Fig. 3). In Figs. 4 and 5 the same phenomenon is presented when the stimulation was made at 50 msec, interval and volts. It can be seen in Fig. 6 in superimposed sweeps, in the lower record the evoked potential and in the upper one the effect of reticular formation stimulation, at 100 msec, interval and 4 volts. FF. 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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