Actuality and originality in the scientific thought of Enrico Morselli (1852-1929).

Enrico Morselli, a student of Carlo Livi, offered an original contribution to psychiatry of his time through a plurality of interests and in-depth medical, biological, neurological, anthropological and sociological knowledge. From his writings, the relevance of his theoretical reflection under different aspects emerged: epistemological, methodological and psychopathological and of humanization of the treatment of the mentally ill.