Dyslexia; phonological deficit theoryDyslexia or DRD is described as the difficulty in learning to read fluently despite regular intelligence. This includes difficulties with letter awareness, letter decoding, processing speed, short-term memory, language skills/verbal comprehension, and rapid naming (Silverman, L. (2000). Dyslexia is a learning difficulty very common learning and a highly recognized reading disorder. According to Castles, A. 2014 there are two types of dyslexia: “Acquired dyslexia which is a reading disorder in someone who has learned to read normally but has lost that ability afterwards. brain damage Developmental dyslexia is a reading disorder in someone (often a child ) who has never learned to read normally.” I will focus on developmental dyslexia In 1897 Shaywitz S wrote about a teenager called Percy F, who was easily even intellectually puts his classmates at a disadvantage with his poor ability to learn to read. As in 1897, today most societies associate intellect with the ability to read, but millions of people with dyslexia break the connection between reading and intelligence. (Shaywitz. S, 1996). Scientists are therefore left with the problem: what are the origins of dyslexia if intellect is not the indicator? Reading difficulties in these children are established as (extreme) difficulties in acquiring rudimentary reading skills such as “word identification and phonological decoding” (Harris & Sipay, 1990). Problems like these are expected to occur in nearly 12% of children between the ages of 6 and 16 and are usually due to specific deficiencies in cognitive skills such as reading, writing, etc. (Benton & Pearl, 1978; Harris & Sipay, 1990; Shaywitz, ...... half of article ......ia: Review of the evidence for a disorder of visual selective attention. (Valdois, S, et al) Vellutino, Frank R. Jack M. Fletcher, Margaret J. Snowling, Donna M. Scanlon, January 2004. “Specific Reading Disability (Dyslexia): What Have We Learned Over the Past Four Decades?” Psychiatry (Blackwell Synergy) McCrory E. 2001, A neurocognitive investigation of phonology. London PhD: University College London. FR. 1999, Developmental dyslexia: related to specific or general deficits Henning, U & Egil Tønnessen, F, 2007. "The notion of phonology in dyslexia research: cognitivism - and beyond"..)