. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . point, though perhaps notquite so minutely as this, upon the visual cortex. The projectionof corresponding points of the two retinas must be superimposedin the visual areas, the right half of each retina being projected on Klinische und anatomische Beitrage zur Paifiologie des Gehirns (Upsala, 1890-1892); On the Visual Path and Centre, Brain, 1893, p. 170. Ergebnisse der Physiohgie, 1902, I, part 2, pp. 653, 661. PHENOMENA OF PSYCHICAL BLINDNESS 249 t
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . point, though perhaps notquite so minutely as this, upon the visual cortex. The projectionof corresponding points of the two retinas must be superimposedin the visual areas, the right half of each retina being projected on Klinische und anatomische Beitrage zur Paifiologie des Gehirns (Upsala, 1890-1892); On the Visual Path and Centre, Brain, 1893, p. 170. Ergebnisse der Physiohgie, 1902, I, part 2, pp. 653, 661. PHENOMENA OF PSYCHICAL BLINDNESS 249 the right visual cortex, and the left half of each retina on the leftvisual area. Excitation of the occipital lobe gives rise to movements of theeyes, and Schafer found that different movements were obtainedby exciting different portions of this lobe; for example, excitationof the posterior part gave an upward movement of both eyes. Thisresult is harmonious with that of Henschen just stated, since anupward movement of the eyes is what occurs when a bright lightfrom above suddenly shines into the eye, striking the lower part Central fissure. FiQ. 106.—The Auditory Area. of the retina. It is probable that our ordinary movements of theeyes in looking at an object, i. e., in directing the centre of clearvision upon it, are reactions through the visual area, and not throughthe motor area. And motor fibres leading downward from thevisual area toward the mid-brain have been demonstrated by vonMonakow. If the calcarine region is the receiving station for optic impulses,it is probable that neighboring portions of the occipital lobes areconcerned with those more complicated visual functions, the lossof which is betrayed by the different sorts of psychical blindness. § 15. The evidence in favor of an auditory centre is of the samekind as that in favor of the visual centre; and the history of its local-ization is much the same. There has been general agreement, froman early period of the
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