Colour agnosia impairs the recognition of natural but not of non-natural scenes.
Scene recognition can be enhanced by appropriate colour information, yet the level of visual processing at which colour exerts its effects is still unclear. It has been suggested that colour supports low-level sensory processing, while others have claimed that colour information aids semantic categorization and recognition of objects and scenes. We investigated the effect of colour on scene recognition in a case of colour agnosia, M.A.H. In a scene identification task, participants had to name images of natural or non-natural scenes in six different formats. Irrespective of scene format, M.A.H. was much slower on the natural than on the non-natural scenes. As expected, neither M.A.H. nor control participants showed any difference in performance for the non-natural scenes. However, for the natural scenes, appropriate colour facilitated scene recognition in control participants (i.e., shorter reaction times), whereas M.A.H.'s performance did not differ across formats. Our data thus support the hypothesis that the effect of colour occurs at the level of learned associations.
Nijboer
Tanja C W
TC
Universiteit Utrecht, Department of Experimental Psychology, Helmholtz Institute, Utrecht, The Netherlands. t.c.w.nijboer@fss.uu.nl
Van Der Smagt
Maarten J
MJ
Van Zandvoort
Martine J E
MJ
De Haan
Edward H F
EH
D000328:Adult; D000377:Agnosia / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D001245:Association Learning; D002531:Cerebellum / Q000098:blood supply / Q000473:pathology / Q000503:physiopathology; D002544:Cerebral Infarction / Q000150:complications / Q000473:pathology / Q000503:physiopathology; D003118:Color Perception; D004777:Environment; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009483:Neuropsychological Tests; D021641:Recognition, Psychology; D012660:Semantics; D012720:Severity of Illness Index; D014796:Visual Perception / Q000502:physiology