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What is the Dyslexia?

Dyslexia is a learning disability that manifests primarily as a difficulty with written language, particularly with reading and spelling. It is separate and distinct from reading difficulties resulting from other causes, such as a non-neurological deficiency with vision or hearing, or from poor or inadequate reading instruction.Evidence also suggests that dyslexia results from differences in how the brain processes written and/or spoken language. Although dyslexia is thought to be the result of a neurological difference, it is not an intellectual disability. Dyslexia has been diagnosed in people of all levels of intelligence

Subtypes of developmental dyslexia

Studies by Castles and Coltheart suggest that developmental dyslexia includes at least two prevalent and distinct varieties or subtypes of dyslexia. Subtypes include surface dyslexia and phonological dyslexia. Understanding these subtypes is useful in diagnosing learning patterns and developing approaches for overcoming impairments that may be visual perception impairments or speech discrimination deficits. These subtypes are based on differing patterns of underlying symptoms, as supported by a finding using large-scale data from comparative studies of reading patterns in dyslexic and normal readers . In the study by Castles and Coltheart, 56 dyslexic boys and 56 non-dyslexic boys as a control group were tested. During the test, the boys read aloud words and non words that were presented to them. The researchers found that surface dyslexics (subjects who have poor lexical skills, or can’t make out irregular words well) had a mean difference of 14.4 words between reading regular words versus irregular words, however, the mean difference in subjects with phonological dyslexia (subjects who can’t use sub lexical skills, or can’t make out non words) was only 7.75 words which was comparable to the control group . The majority of their subjects showed signs of phonological dyslexia. Twenty-nine subjects showed that their non word reading skills were poorer than their irregular word reading skills. However, sixteen subjects showed the opposite where their irregular word reading skills were poorer than their non word reading skills and were called surface dyslexics

• Surface dyslexia
• Phonological dyslexia
• Double deficit dyslexia

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