ABSTRACT
In the world of fusion, the body is in osmosis with its environment; appears literally to absorb it. This 'porosity' of the exterior world probably has its origin in mimetism. The state of non-distinction between inside and outside, the 'fusion' between the world and the self corresponds in the human being to the psychic lived experience of the newborn where chaos reigns in a lack of differentiation between self and other, a state of 'adualism'. Psychosis is a mental illness formerly known as 'narcissistic neurosis', a term which highlights its etiology. It is a result of the persistence of the initial state of fusion: with the environment and in particular with the mother. According to psychoanalysis, the psychotic is in a state of fusion called, in Lacanian psychoanalysis, 'jouissance'. The fusional state can also be dangerous and alienating, because the body is in osmosis with its environment, it can literally absorb it by fascination, illusion and identification.
