Dislexias evolutivas: un puzzle por resolver

There are a large number of hypotheses about the causes of developmental dyslexia. Whereas some authors argue that this impairment has its origin in auditory or visual deficits, other authors attribute it to slower processing. Nevertheless, the most defended hypothesis is undoubtedly the hypothesis of the phonological deficit. On the other hand, diverse neurological disorders have been associated to dyslexia such as absence of cerebral asymmetry, alterations in the corpus callosum or abnormalities in the cerebellum. However, there is not yet a hypothesis that integrates the cognitive symptoms with the neurological disorders. This paper presents a brief summary of the main theories about dyslexia and the neurological abnormalities that characterize this syndrome, and suggests some possible connections between neuronal dysfunction and cognitive impairment. We conclude that there are different profiles of dyslexia on the basis of neurological disorders and specific personal experiences of learning.