Stereotypy by Carlos Morra
Persistent repetition of one invariable form of gesture, act or verbal expression without an identifiable objective. The term was introduced in 1864 by Jean-Pierre Falret in his textbook "Les Maladies Mentales et des asiles d´aliénés." It was derived by clinical observation (Guiraud 1936).
References:
Falret JP. Les Maladies Mentales et des asiles d´aliénés. Paris: J.B. Balliére et Fills; 1864, pp. 193-4.
Guiraud P. Analyse du symptôme stéréotypie, avec trois planches hors-texte. Encéphale, 1936; 31: 229-70.