Visually- and motor-based knowledge of letters: evidence from a pure alexic patient

Paolo Bartolomeo, Ac Bachoud Lévi, S Chokron, J. Degos

Risultato della ricerca: Contributo in rivistaArticolo in rivista

56 Citazioni (Scopus)


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.
Lingua originaleEnglish
pagine (da-a)1363-1371
Numero di pagine9
Stato di pubblicazionePubblicato - 2002
Pubblicato esternamente


  • Alexia, Pure
  • Brain Mapping
  • Dominance, Cerebral
  • Humans
  • Imagination
  • Male
  • Middle Aged
  • Neuropsychological Tests
  • Orientation
  • Parietal Lobe
  • Pattern Recognition, Visual
  • Psychomotor Performance
  • Reading
  • Temporal Lobe
  • Writing


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