Sinposis

The observed dynamic effects, such as a gradual loss of functions with decreasing stimulus and their recovery by its intensification or by multisensory or motor facilitation, or by iteration, are explained on a physiological basis. The author describes a careful experimental, quantitative analysis of visual and tactile functions, finding a continuity between simple sensations and higher brain functions. He describes for the first time in great detail phenomena such as inverted or tilted vision, some color disorders, reversal of motion, facilitation, etc. Tactile inversion is also described, generalizing the inverted perception in the central syndrome.