[Brain Lesions and Visual Recognition of Human Faces: A Preliminaky Study]
Drawings of laces are designed according 10 seven binary cues: The eyes (big-little), root of the nose (large-narrow), nose (large-narrow), mouth (great-small), forehead (high-small), ears (big-small) and chin (square-rounded). A set of 27 - 128 various faces is then constructed. Two recognition experiments are presented to 20 normal subjects (control group) and 52 brain damaged patients: 17 with left hemisphere lesions and aphasia. 20 right damaged patients, and 15 subjects with bilateral lesions and aphasia. In a paired comparison experiment, 04 pairs of faces arc presented and a similarity-dissimilarity judgment is required: The duration of presentation (5 and 10 seconds), response types (verbal or not), verbal reinforcement (present or not) and number of common facial cues (0 to 7) are controlled In a multiple choice procedure, one face is compared to 8 other faces and the subject indicates the most similar stimulus among these 8; 16 items are used, according to the number of facial cues and the presence or absence of verbal reinforcement In the two experiments the subject 's response and reaction time are noted. In a neuropsychological perspective three main significant results appear: a. results of brain damaged subjects are lower than those of normal subjects in the paired comparison experiment; b. the right brain damaged patients perform poorer than the left brain damaged subjects in the paired comparison procedure The number of errors differs significantly and the subjects respond slower when a short exposition of stimuli is used; c. faces differing according to the eyes and or the root of the nose induce the highest number of erroneous responses; differences of cars and or chin produce the lowest error number. - It is suggested that the first step of the visual analysis of a face concerns peripherical cues and then the central ones. Right brain damaged patients might have a defect in this sequential strategy (absence of the second step) and/or might use a longer analysis time than other subjects.
How to Cite:
Bruver, R. and Velge, V., 1980. Lésions Cérébrales et Reconnaissance Visuelle du Visage Humain: Une Étude Préliminaire. Psychologica Belgica, 20(2), pp.125–139. DOI: http://doi.org/10.5334/pb.662