Ethological remarks on mannerisms. Conceptualisation and proposal for a definition. off.

Mannerisms are symptoms of various psychiatric disorders. The term has not been defined thoroughly and is often confused with stereotypies or the more generally used term 'bizarreness'. From an ethological perspective, mannerisms may be regarded as pathologically altered forms of ritualised behaviour that serve a communicative purpose. Mannerisms are maladaptive behaviours since they lead to withdrawal of and rejection by the socially interacting partner, or even induce aggressive behaviour due to the pathologically exaggerated and overdrawn appearance. The behaviour-physiology interactions of manneristic behaviour are not fully understood. Altered brain metabolism and disturbed perceptivity of social signals may be involved.