title: [Prosopagnosia. Role of the right hemisphere in visual perception. (Apropos of a case after right occipital lobectomy)].
abstract: The authors describe a case of prosopagnosia which appeared a month after right occipital lobectomy. Results obtained by means of various tests devised to analyse this perception disorder have produced the following conclusions: 1) results of pairing tests which require a high level of perceptive differentiation are successful but after abnormally long delays; 2) in spite of this success, faces--even the patient's own--are not recognized; 3) this disorder extends to affect every task requiring recognition of the individual nature of a stimulus; 4) this individuality has the peculiarity of being based on visual patterns which it is impossible, or almost impossible, to express verbally; 5) the part played by defective visual representation in the brain is discussed; 6) a posterior lesion of the minor hemisphere is a prerequisite of prosopagnosia; 7) these facts, in conjunction with the findings in cases of inter-hemispheric disconnection lead one to think that the minor hemisphere, in right-handed subjects, plays a major part in the development and treatment of highly differentiated visual patterns which it is impossible, or almost impossible, to express verbally.
mesh_terms: D000328:Adult; D000377:Agnosia / Q000209:etiology / Q000503:physiopathology*; D001165:Arteriovenous Malformations / Q000601:surgery; D005260:Female; D006801:Humans; D009778:Occipital Lobe / Q000098:blood supply / Q000601:surgery; D011612:Psychosurgery; D011932:Reading; D014794:Visual Fields; D014796:Visual Perception
vernacular_title: La prosopagnosie. Role de l'hémisphère droit dans la perception visuelle. (A propos d'un cas consécutif à une lobectomie occipitale droite)