To this end we invited a group of brilliant authors to contribute. In this issue we wished to present the current state of knowledge about the various aspects of the concept-clinical and pathophysiological aspects, neuroimaging, and therapy. Modern psychiatrists (eg, Robert Spitzer) have left aside the idea of neuroses, to classify obsessive symptoms as "problems" belonging at the same time to the behavioral and somatic domains the relationship between obsessive-compulsive disorders and possible neuroanatomic and neurophysiologic anomalies favors this classification. Several explanatory models have been put forward, the best-known being that of Sigmund Freud. The repetition of these gestures or behaviors invades the subject's life, often going as far as rituals that are handicapping and often dangerous. Thus, the only way to find relief (albeit transient) from anxiety is to perform an act that has no rational explanation or logic, but that can often be rationalized secondarily.
The notion of compulsion implies the inability of the subject to refuse to obey the orders of his or her subconscious mind to carry out a particular gesture or a particular behaviour. It would not have been possible, in this collection of articles, to envisage an exhaustive discussion of all the various obsessive symptoms, so we chose to provide the most recent information on obsessive-compulsive disorders. They do not, however, represent stages or degrees of the pathology, but rather they characterize a clinical case or a given form of the illness. However, certain traits are dominant or preponderant, as they affect the relationship between self and others, or with the environment. The range of neurotic symptoms is vast, and is made up of a huge variety of particular signs which are often specific to the personal history of the individual. Modern neuroses range from the hysteria described by Charcot to the obsessiveness described by Pierre Janet, and thus, in a certain way, from a highly disturbed image of one's self and of others to the symbolic investment of objects with a phobic dimension.
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