Fifty respondents were recorded at the Hôpital Sainte-Anne, and the recordings were transcribed. The corpus consists of 600 typewritten pages, and includes spontaneous and semi-induced (questions about reasons for hospitalization, professional and family life, etc.) language, and responses to various exercises that can be analyzed to show how schizophrenics use language and linguistic forms: exercises calling for morphological or lexical negative transformations, for synonyms, for word definitions, for sentence production, etc. Certain of the exercises were also given to senile dementia patients and to different types of aphasics (cf. the work of H. Hécaen, J. Dubois, P. Marcie, etc.), permitting comparative studies among the different populations.