. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 386 BRAIN MECHANISMS AND LEARNING logically to the nucleic acids and, for events which are primarily cytoplas- mic, to the ribonucleic acids. Ribonucleic acid stains (methyl green pyronin method) have been done on sections through the region of the mirror focus in nine animals after preliminary electrical studies had clearly indicated the extent and distribu- tion of both primary and secondary discharging areas. Control sections were taken from electrically uninvolved areas of brain and, in addition, every
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. 386 BRAIN MECHANISMS AND LEARNING logically to the nucleic acids and, for events which are primarily cytoplas- mic, to the ribonucleic acids. Ribonucleic acid stains (methyl green pyronin method) have been done on sections through the region of the mirror focus in nine animals after preliminary electrical studies had clearly indicated the extent and distribu- tion of both primary and secondary discharging areas. Control sections were taken from electrically uninvolved areas of brain and, in addition, every third section was treated with ribonucleasc to insure that the sub-. FlG. 1 I Higher pi) werphntoinicrogrdph denumstrating the characteristic concentration of pyronin positive material along the inner surface of the membrane. The stained material extends far into the dendrite. Note also the appearance of a bilobcd nucleus Methyl green pyronin stain. Magnification â 840. Stance stained was ribonucleic acid. Fig. 9 demonstrates a small nest of darkly stained cells surrounded by the more lightly coloured regions of normal cortex. Such densely stained cells were consistently found in areas coincident with the electrically defined mirror focus. A slightly higher power photomicrograph (Fig. 10) illustrates the penetration of the pyronin-positive material into the dendrite and also indicates the wedge- like distribution of the stained cell system. Pigmented cells extend through- out the depth of the cortex. At still higher magnification the extent of penetration into the dendrite is clearer (Fig. i 1) and one may observe 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, Il
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