On a Case of Sudden and Isolated Suppression of the Mental Vision of Signs and Objects (Forms and Colours). 1

Gall, Gratiolet, Ribot, on partial memories.—Partial destruction of the different forms of memory.—Visual memory.—Galton’s observations.—Case of sudden suppression of the visual memory.—Its effects.—Substitution by auditory images.—Verbal amnesia does not correspond to a simple pathological condition.—The condition is a complex one [complexus]; in educated persons four fundamental elements can be recognised in it; the commemorative auditive image; the visual image; and two motor elements, to wit, the motor image of articulation, and the motor image of writing.