Glossary of psychiatry occurs within 2–3 months. Brain fag syndrome is an example of a culture-bound syndrome. "Brain fag" was once a common term for mental exhaustion. Today, the syndrome describes students (predominantly males, particularly in West Africa) experiencing symptoms including somatic, sleep-related and cognitive complaints, head and neck pains, difficulty in concentrating and retaining information, and eye pain. Brain fog is another term for #Clouding of consciousness. Bruxism refers to teeth grinding behaviour that is usually seen in children. In Capgras syndrome, the patient feels that a person familiar to him, usually a family member has been replaced by an imposter. This
Involuntary memory a no less valid proof for its existence during the intervening time. As more exact observation teaches us, the occurrence of these involuntary reproductions is not an entirely random and accidental one. On the contrary they are brought about through the instrumentality of other immediately present mental images. Moreover, they occur in certain regular ways that, in general terms, are described under the so-called "laws of association".' Marcel Proust was the first person to coin the term involuntary memory, in his novel "À la Recherche du Temps Perdu" ("In Search of Lost Time" or "Remembrance of Things Past"). Proust did