title: In search of closure: subjective contour illusions, Gestalt completion tests, and implications.
abstract: This study investigates the construct validity of perceptual closure tests (CTs), and isolates a common processing demand from the right-hemisphere. Sixty-seven patients with focal unilateral lesions (34 right side, 33 left side), and 80 control subjects participated. Multivariate analyses indicated that there was substantial age-related variance in all CTs, while sex was variably significant; CTs are not uniform in their discriminating ability, and hence factorially complex; and their specifically right hemisphere-sensitive dimension was subjective contour illusions, and interestingly unrelated to facial discrimination ability. The methodological and theoretical implications are discussed.
mesh_terms: D001925:Brain Damage, Chronic / Q000175:diagnosis* / Q000473:pathology; D002540:Cerebral Cortex / Q000473:pathology; D003937:Diagnosis, Differential; D004292:Dominance, Cerebral; D005556:Form Perception; D006801:Humans; D009483:Neuropsychological Tests; D010466:Perceptual Closure; D011594:Psychometrics