Rapid categorization of faces and objects in a patient with impaired object recognition.
We tested rapid-categorization in a patient who was impaired in face and object recognition. Photographs of natural scenes were displayed for 100 ms. Participants had to press a key when they saw an animal among various objects as distractors or human faces among animal faces as distractors. Though the patient was impaired at figure/ground segregation, recognized very few objects and faces, she categorized animals and faces with a performance ranging between 70 and 86% correct. Displaying pictures in isolation did not improve performance. The results suggest that rapid categorization can be accomplished on the basis of coarse information without overt recognition.
Boucart
Muriel
M
LNFP, Universite Lille Nord de France, CNRS, Lille, France. m-boucart@chru-lille.fr
Moroni
Christine
C
Despretz
Pascal
P
Pasquier
Florence
F
Fabre-Thorpe
Michele
M
D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D000849:Anomia / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology*; D001284:Atrophy / Q000150:complications / Q000000981:diagnostic imaging / Q000473:pathology; D001924:Brain Concussion / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology; D001931:Brain Mapping; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008569:Memory Disorders / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology*; D008875:Middle Aged; D009483:Neuropsychological Tests; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D020238:Prosopagnosia / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology*; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors; D015899:Tomography, Emission-Computed, Single-Photon