Selective alexia and agraphia sparing numbers—a case study  

Oleh:

Starrfelt, Randi

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 102 no. 1 (2007), page 52-63.
Topik: Alexia; Agraphia; Reading and writing; Letter reading; Number reading; Exner’s area; Visuo-motor interaction; Number writing; Third alexia
Fulltext: 102_01_Starrfelt.pdf (513.04KB)

Isi artikel

We report a patient (MT) with a highly speciWc alexia aVecting the identiWcation of letters and words but not numbers. He shows a corresponding deWcit in writing: his letter writing is impaired while number writing and written calculation is spared. He has no aphasia, no visuo-perceptual or -constructional diYculties, or other cognitive deWcits. A similar pattern of performance has to our knowledge only been reported once before [Anderson, S. W., Damasio, A. R., & Damasio, H. (1990). Troubled letters but not numbers. Domain speciWc cognitive impairments following focal damage in frontal cortex. Brain, 113, 749–766]. This study shows that letter and number reading are dependent on dissociable processes. More interestingly, it points to a common mechanism subserving the perception and production of letters. We suggest that a deWcit in a visuo-motor network containing knowledge of the physical shape of letters might explain the pattern of performance displayed by MT.

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