title: Colour, face, and visuospatial imagery abilities in low-vision individuals with visual field deficits.
abstract: This study investigates to what extent visual perception integrity is necessary for visual mental imagery. Sixteen low-vision participants with severe peripheral visual field loss, 16 with severe central field loss, 6 left brain-damaged patients with right homonymous hemianopia, 6 right brain-damaged patients with left homonymous hemianopia, and 16 normally sighted controls performed perceptual and imagery tasks using colours, faces, and spatial relationships. Results showed that (a) the perceptual and mental image>ry disorders vary according to the type of visual field loss, (b) hemianopics had no more difficulties imagining spatial stimuli in their contralesional hemispace than in their ipsilesional one, and (c) the only hemianopic participant to have perceptual and mental imagery impairments suffered from attentional deficits. Results suggest that (a) visual memory is not definitively established, but rather needs perceptual practice to be maintained, and (b) that visual mental imagery may involve some of the attentional-exploratory mechanisms that are employed in visual behaviour.
authors.affiliation: ERT TREAT VISION, Service de Neurologie, Fondation Ophtalmologique A de Rothschild, 25 rue Manin, Paris, France. dulindavid@yahoo.fr
authors.forename: David
authors.initials: D
authors.lastname: Dulin
authors.forename: Céline
authors.initials: C
authors.lastname: Cavezian
authors.forename: Coline
authors.initials: C
authors.lastname: Serrière
authors.forename: Anne-Catherine
authors.initials: AC
authors.lastname: Bachoud-Levi
authors.forename: Paolo
authors.initials: P
authors.lastname: Bartolomeo
authors.forename: Sylvie
authors.initials: S
authors.lastname: Chokron
mesh_terms: D000328:Adult; D001921:Brain / Q000473:pathology; D016022:Case-Control Studies; D003116:Color; D005145:Face; D005260:Female; D006423:Hemianopsia / Q000473:pathology / Q000503:physiopathology / Q000523:psychology; D006801:Humans; D007092:Imagination / Q000502:physiology; D007600:Judgment; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D059906:Neuroimaging; D012174:Retinitis Pigmentosa / Q000473:pathology / Q000503:physiopathology / Q000523:psychology; D015354:Vision, Low / Q000473:pathology / Q000503:physiopathology / Q000523:psychology*; D014794:Visual Fields / Q000502:physiology; D014796:Visual Perception