Abstract
Developmental disorders of reading and spelling have long been associated with increased left- and mixed-handedness but the evidence has been controversial. The right shift (RS) theory of handedness and cerebral dominance, developed by Annett from 1972 onward, offers resolutions to several puzzles about laterality in the so-called dyslexias. This review of findings in the light of the theory shows that "phonological" dyslexics are less likely to be right-handed, while "surface" or "dyseidetic" dyslexics are more likely to be right-handed than the general population.
Highlights
„Dyslexia‟ is a controversial term for weakness in learning to read or spell which cannot be explained by other disabilities or lack of opportunity to learn
Some researchers have restricted the term to poor readers who are of normal intelligence, on the assumption that most poor readers are handicapped by low ability
One of the most securely established facts about dyslexics is a tendency to weakness in processing speech sounds, described as poor phonology (Snowling, 2000; Wagner & Torgersen 1987)
Summary
„Dyslexia‟ is a controversial term for weakness in learning to read or spell which cannot be explained by other disabilities or lack of opportunity to learn (reviews, Beaton, 2004; Vellutino & Fletcher, 2005). A clue to possible problems was given by the finding that strong right-handers tend to have weak left hands on a test of peg moving skill.
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