Dislexias y procesamiento cognitivo

A cognitive model that explains the dyslexias is described. This model has two stages and three levels. The stages are decoding of letters and words, and decoding-encoding of meaning. The three levels are: Surface or receptive level; Superior or central level; Intermediate or transformation level. This cognitive model describes dyslexias as deficiencies in the intermediate processing, in which the graphical signs are first transformed in phonological sequencies and then in verbal meaning. Principal intermediate processes concerned with dyslexias are short term verbal working memory, phonological processing and orthographic visual processing. Deficiencies in these three processes play a causality in dyslexias. They can be used as a way for rehabilitation of dyslexics as well.