1. Visually- and motor-based knowledge of letters: evidence from a pure alexic patient
- Author
-
Jean-Denis Degos, Paolo Bartolomeo, Sylvie Chokron, and Anne-Catherine Bachoud-Lévi
- Subjects
Male ,Dissociation (neuropsychology) ,genetic structures ,Settore M-PSI/02 - PSICOBIOLOGIA E PSICOLOGIA FISIOLOGICA ,Cognitive Neuroscience ,media_common.quotation_subject ,Writing ,Experimental and Cognitive Psychology ,Engram ,Neuropsychological Tests ,050105 experimental psychology ,03 medical and health sciences ,Behavioral Neuroscience ,0302 clinical medicine ,Reading (process) ,Orientation ,Parietal Lobe ,medicine ,Humans ,0501 psychology and cognitive sciences ,Language disorder ,Dominance, Cerebral ,media_common ,Brain Mapping ,05 social sciences ,Dyslexia ,Alexia, Pure ,Middle Aged ,medicine.disease ,Visual appearance ,Pure alexia ,Temporal Lobe ,Pattern Recognition, Visual ,Reading ,Imagination ,Psychology ,030217 neurology & neurosurgery ,Psychomotor Performance ,Cognitive psychology ,Mental image - Abstract
We describe a patient, VSB, whose reading was impaired as a consequence of a left temporal- parietal lesion, whereas writing was relatively preserved. At variance with other pure alexic patients described in the literature, VSB claimed to have become unable to mentally visualise letters and words. Indeed, his performance on a series of tests tapping visual mental imagery for orthographic material was severely impaired. However, performance on the same tests was dramatically ameliorated by allowing VSB to trace each item with his finger. Visual mental imagery for non-orthographic items was comparatively spared. The pattern of dissociation shown by VSB between impaired visual mental imagery and relatively preserved motor-based knowledge for orthographic material lends support to the view that separate codes, respectively based on visual appearance and on motor engrams, may be used to access knowledge of the visual form of letters and words.
- Published
- 2002