Reciprocal.—Used of cases where there is both agency and percipience at each end of the telepathic chain, so that A perceives P, and P perceives A also.
*Retrocognition.—Knowledge of the past, supernormally acquired.
Secondary personality.—It sometimes happens, as the result of shock, disease, or unknown causes, that an individual experiences an alteration of memory and character, amounting to a change of personality, which generally seems to have come on during sleep. The new personality is in that case termed secondary, in distinction to the original, or primary, personality.
Secondary sensations (Secunddrempfindungen, audition colorée, sound-seeing, synæsthesia, etc.).—With some persons every sensation of one type is accompanied by a sensation of another type; as for instance, a special sound may be accompanied by a special sensation of colour or light (chromatisms or photisms). This phenomenon is analogous to that of number-forms,—a kind of diagrammatic mental picture which accompanies the conception of a progression of numbers. See Galton's Inquiries into Human Faculty.
Shell-hearing.—The induction of hallucinatory voices, etc., by listening to a shell. Analogous to crystal-gazing.
Stigmatisation.—The production of blisters or other cutaneous changes on the hands, feet, or elsewhere, by suggestion or self-suggestion.
Subliminal.—Of thoughts, feelings, etc., lying beneath the ordinary threshold (limen) of consciousness, as opposed to supraliminal, lying above the threshold.
Suggestion.—The process of effectively impressing upon the subliminal intelligence the wishes of some other person. Self-suggestion means a suggestion conveyed by the subject himself from one stratum of his personality to another, without external intervention.
*Supernormal.—Of a faculty or phenomenon which transcends ordinary experience. Used in preference to the word supernatural, as not assuming that there is anything outside nature or any arbitrary interference with natural law.
Supraliminal.—See Subliminal.