... suited to variables which can be measured on a scale (test scores). The standard deviation is then used to determine those outside the boundaries of 'normal'. A medical definition of 'normal' is those individuals which display an appropriately functioning physiology and nervous system. In this case disease or physical disorder can explain psychological abnormality although it is recognised that often external and social factors may serve as a trigger. A cultural definition of normal would be those people who display behaviour which is in line with the political, economic and social expectations of the culture in which they live (Wood and Richardson 2002). Dyslexia could fall into any of these definitions of abnormal. A person displaying statistically a below average reading age, medically the brain not functioning as would be expected and culturally not performing at a literate level expected by the political and societal expectations of their culture. Dyslexia is ...

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