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The centrality of the body and the intersubjective dimension form the basis of neuroscientific research on Peri-Personal Space (PPS), which investigates the somatic side of psychic experience underlying the perception of self and other. The PPS, where the integration of sensory stimuli takes place and the self/other boundary is constructed, is already structured at birth and is plastically modified in response to affective stimuli. The reduction of the SPP in schizophrenic patients and healthy subjects with a high degree of schizotypy demonstrates both the delicacy of the self/other boundary in such functioning and the presence of a neurobiological continuum corresponding to a psychopathological continuum in the difficulty of multisensory integration. Such evidence supports some reflections on early trauma and states of differentiation in relationships, with clinical implications in the treatment of psychosis.
KEY WORDs: body, bodily self, intersubjectivity, multisensory integration, neurosciences and psychoanalysis, peri-personal space, Self/other boundary.