Dyslexia
Eric Johnson Dyslexia Dyslexia has been defined as a chronic neurological disorder causing inability or great difficulty in learning to read or spell, despite normal intelligence. Dyslexia: Britannica Concise Encyclopedia. ... Dyslexia: The Columbia Encyclopedia, 6th ed. ... In a neurological evaluation, the International Dyslexia Association (formerly the Orton Dyslexia Society) published the following definition of dyslexia:"Dyslexia is a neurologically-based, often familial disorder which interferes with the acquisition of language. ... Dyslexia is not the result of lack of motivation, sensory impairment, inadequate instructional or environmental opportunities, but may occur together with these conditions. Although dyslexia is lifelong, individuals with dyslexia frequently respond successfully to timely and appropriate intervention" (Orton Dyslexia Society, 1994). Despite the various definitions, dyslexia appears now to be widely recognized as being a specific learning disability of neurological origin that does not imply low intelligence or poor educational potential, and which is independent of race and social background. Much research has concentrated on seeking to explain the cause of dyslexia, but as yet this has been somewhat inconclusive. ... Dyslexia: by Sally E. ... Further research has found that that the effects of dyslexia are due, in part, to heritable influences. The latest brain imaging techniques, as well as encephalographic recording of the electrical activity of the brain, and even post-mortem examination, all reveal a range of functional and structural cerebral anomalies of persons with dyslexia.