[Neuropsychology and psychological testing: boundaries and proximity (author's transl)]

The psychological testing is briefly described and we present the fields of proximity between neuropsychology and psychometry (psychosurgery and aphasiology. Yet it appears that usefulness of psychometry in neuropsychology is only limited to practical aspects. The main limitation arises from two problems: non-neuropsychological goal of psychometry and non-functional and quantitative studies of behavior. A specific "neuropsychometry" is presented and examples are suggested from studies of italian, soviet (Luria's school) and swiss (Piaget's method) researchers; applications in clinical neuropsychology are discussed. In conclusion, neuropsychology must produce a functional analysis of behavior and conceive this behavior as a reorganisation rather than a deficit or a loss.