Nervous and mental diseases . THE CEREBRAL CORTEX—LOCALIZATION. 167 mainly represented in the left cortex in right-handed individuals. Thesuperior weight and development of the left half-brain is probablylargely attributable to its better nutritive supply through the arrangementof the vessels at the aortic arch and the larger caliber of the left induces right-handedness, which in time, no doubt, retroactively in-creases the functional activity of the left cortex. At the same timethe left hemisphere becomes potentially greater, more acquisitive, andtherefore largely the seat of acq
Nervous and mental diseases . THE CEREBRAL CORTEX—LOCALIZATION. 167 mainly represented in the left cortex in right-handed individuals. Thesuperior weight and development of the left half-brain is probablylargely attributable to its better nutritive supply through the arrangementof the vessels at the aortic arch and the larger caliber of the left induces right-handedness, which in time, no doubt, retroactively in-creases the functional activity of the left cortex. At the same timethe left hemisphere becomes potentially greater, more acquisitive, andtherefore largely the seat of acquired motor and sensory education, whichin turn increases its growth. It is probable that some overflow occurs APM. Fig. 66.—Scheme to represent the cortical arterial circulation, a p m, Artery of the pia mater;a c, short arteries to the gray matter only; a l, long arteries penetrating the white substance (afterBrissaud). in most brains, so that automatic emotional and expletive expressionseither come to be located in the right brain or their frequent repetitionsufficiently educates the right cortex to enable them to be recalledthrough its agency when the left centers are cut off. Similarly, if speechcontrol be lost to the left half-brain, the right, especially in young per-sons, may be in turn educated to take its place in large measure. It isworthy of consideration whether the whole conscious and unconscioustendency of education, habit, custom, and practice to make all men right-handed is not a serious mistake. It seems plausible that should left-handed ness, or rather ambidexterity, be assiduously cultivated in chil-dren, the two hemispheres of the brain might enjoy a greater equalityand the i
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