title: The role of lines and corners of geometric figures in recognition performance.
abstract: A relative role of lines and corners of images of outline geometric figures in recognition performance was studied psychophysically. Probability of correct response to the shape of the whole figure (control) and figures with lines or corners masked to a different extent was compared. Increase in the extent of masking resulted in a drop of recognition performance that was significantly lower for figures without corners, than for figures without part of their lines. The whole 3D figures were recognized better than 2D ones, whereas the opposite relations were observed under conditions of masking. Significant gender difference in a recognition performance was found: men recognize entire and partly masked figures better than women. Possible mechanisms of relatively better recognition of figures with corners than with lines are discussed in connection with finding of high sensitivity of many neurons in the primary visual cortex to line crossing and branching.
authors.affiliation: Department of Sensory Physiology, Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, 5a Butlerova Street, Moscow 117485, Russia. shevelev2@mail.ru.
authors.forename: Igor A
authors.initials: IA
authors.lastname: Shevelev
authors.forename: Viktorina M
authors.initials: VM
authors.lastname: Kamenkovich
authors.forename: George A
authors.initials: GA
authors.lastname: Sharaev
mesh_terms: D000328:Adult; D003071:Cognition / Q000502:physiology*; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D012727:Sex Characteristics; D014796:Visual Perception / Q000502:physiology*