'Bucknill and Tuke noted that Ferrier 'does not regard one part of the brain as the organ of the mind, and another part as the organ of motion, &c., but the same parts as having but a subjective and objective function'. '[T]he endeavour to reduce mental phenomena, in the last analysis, to their motor and sensory physiological equivalents', they argued, would lead the way to 'a localization of mental function, and therefore the correlation of morbid cerebral and morbid mental conditions, out of which a classification [of insanity] may be possible.'' (135-136)