A clinical follow-up lasting from 1 to 6 years on 25 outpatients affected by endogenous psychoses and manifesting ego disorders demonstrates the presence of both activity and passivity experiences in schizophrenias and affective psychoses. No differential diagnosis between the two nosographical groups can be based on the phenomenological characteristics of passivity and activity experiences. Regarding the schizophrenic sample, our observations suggest reconsidering on theoretical grounds the validity of the construct 'loss of ego boundaries'.