_Paræsthesia._--Erroneous or morbid sensation. _Paramnesia._--All forms of erroneous memory. _Paraphasia._--The erroneous and involuntary use of one word for another. _Percipient._--The correlative term to Agent; the person on whose mind the telepathic impact falls; or, more generally, the person who perceives any motor or sensory impression. _Phantasm and Phantom._--Phantasm and phantom are, of course, mere variants of the same word; but since phantom has become generally restricted to _visual_ hallucinations, it is convenient to take phantasm to cover a wider range, and to signify any hallucinatory sensory impression, whatever sense--whether sight, hearing, touch, smell, taste, or diffused sensibility--may happen to be affected. _Phantasmogenetic centre._--A point in space apparently modified by a spirit in such a way that persons present near it perceive a phantasm. _Phobies._--Irrational restricting or disabling preoccupations or fears; _e.g._, _agoraphobia_, fear of open spaces. _Photism._--See _Secondary sensations_. _Point de repère._--Guiding mark. Used of some (generally inconspicuous) real object which a hallucinated subject sometimes sees as the nucleus of his hallucination, and the movements of which suggest corresponding movements of the hallucinatory object. _Polyzoism._--The property, in a complex organism, of being composed of minor and quasi-independent organisms. This is sometimes called "colonial constitution," from animal _colonies_. _Possession._--A developed form of motor automatism, in which the automatist's own personality disappears for a time, while there appears to be a more or less complete substitution of personality, writing or speech being given by another spirit through the entranced organism. _Post-hypnotic._--Used of a suggestion given during the hypnotic trance, but intended to operate after that trance has ceased. _Precognition._--Knowledge of impending events supernormally acquired. _Premonition._--A supernormal indication of any kind of event still in the future. _*Preversion._--A tendency to characteristics assumed to lie at a further point of the evolutionary progress of a species than has yet been reached; opposed to reversion. _*Promnesia._--The paradoxical sensation of recollecting a scene which is only now occurring for the first time; the sense of the _déjà vu_. _*Psychorrhagy._--A special idiosyncrasy which tends to make the phantasm of a person easily perceptible; the breaking loose of a psychical element, definable mainly by its power of producing a phantasm, perceptible by one or more persons, in some portion of space. _*Psychorrhagic diathesis._--A habit or capacity of detaching some psychical element, involuntarily and without purpose, in such a manner as to produce a phantasm. _Psycho-therapeutics._--"Treatment of disease by the influence of the mind on the body." (Tuke's _Dict._)