Semantic dyslexia
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Semantic dyslexia is, as the name suggests, a subtype of the group of cognitive disorders known as Alexia (acquired dyslexia). Those who suffer from semantic dyslexia are unable to properly attach words to their meanings in reading and/or speech. When confronted with the word "diamond", they may understand it as "sapphire", "shiny" or "diamonds"; when asking for a bus ticket, they may ask for some paper or simply "a thing".
Semantic dementia (SD) is a degenerative disease characterized by atrophy of anterior temporal regions (the primary auditory cortex; process auditory information) and progressive loss of semantic memory. SD patients often present with surface dyslexia, a relatively selective impairment in reading low-frequency words with exceptional or atypical spelling-to-sound correspondences.[1]
[edit] References
- John C. Marshall1 and Freda Newcombe, Patterns of paralexia: A psycholinguistic approach, Journal of Psycholinguistic Research, Volume 2, Number 3, pp. 175-199, September 1973 [1]
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