The cortical reorganization causes a reciprocal shift of psychological attitudes. It is the physical aspect of a simultaneous mental reformation. The reorganization is automatic; it depends on conditions and the subject does not apprehend it directly. Deficiency of the same receptors and the same environment tend to evoke identical cortical and psychological change. The direction and rate of development of the brain’s latent abilities depend on the environment and practice. Although cortical reorganization is unconscious the environmental conditions direct it.