The fact that tics only occur in individuals of the degenerate class has been recognised by most writers on these affections. The aim of the present paper is to describe more fully the special mental state which accompanies the tic. The authors find the most constant features of that state in a weakness and instability of the will and the emotions, recalling conditions which are normal in childhood. This state of psychic infantilism is expressed in an inconstancy and variability of ideas, to which corresponds a similar variability of tic movements. Tics localised to particular muscles or groups of muscles similarly have their counterpart in such psychic abnormalities as fixed ideas, obsessions, etc. A tic may thus arise from an obsession if the besetting idea provokes a motor reaction; or, inversely, a tic may engender an obsession. The mental basis is similar in the two cases, and it is not rare to see obsessions and tics alternate or coincide in the same individual. The different varieties of phobia, the dilire du toucher, hypochondriacal doubts, etc., are mentioned as forms of obsession, common in the subjects of tic. The authors urge that it is important to distinguish the tics which belong to the fundamental state of psychic infantilism from those which are related to these secondary mental disorders. In the latter, which are harder to eradicate, it is necessary to direct treatment specially to the mental condition.
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