| Popis: |
What are the causes of dyslexia? Decades of research reflect a determined search for a single cause where a common assumption is that dyslexia is a consequence of problems with converting phonological information into lexical codes. But reading is a highly complex activity requiring many different mechanisms, and a number of different visual problems have been documented in dyslexic readers. We review evidence from various sources for the role of visual factors in dyslexia, highlighting among others recent proposals that problems with high-level vision contribute to dyslexia. We believe that the role of visual problems in dyslexia has been underestimated in the literature, to the detriment of the understanding and treatment of dyslexia. We propose that rather than focusing on a single cause of dyslexia, the questions that need to be answered involve: When does each dysfunction apply, how do these dysfunctions interact, and what symptoms can each account for? |
