NSCI 1001 Lecture Notes - Lecture 6: Inferior Frontal Gyrus, Dyslexia, Cerebral Cortex
3 Oct 2018
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Types of dyslexia: primary dyslexia- produces profound symptoms; problem of information processing in the left cerebral cortex, secondary/developmental dyslexia- no cause, but can be treated and the symptoms will improve with age. Symptoms: can be visual, auditory, or motor: *number and letter reversals, physical difficulty with writing letters. Inability to perceive sounds correctly or to break apart groups of sounds. *the earlier diagnosis, the better the long term outcome. Speech-reading paradox: speaking natural, inherent, reading acquired, taught. Effect of type size: 32% larger for dyslexic children. Effect of line length: 27 % faster when lines have fewer characters. Effect of letter spacing: additional letter spacing in texts helps. Brain region for speech/reading: broca"s area inferior frontal gyrus (articulation/word analysis, parieto-temporal (word analysis, occipito-temporal (word form) Occipital/temporal region- activated during components of reading; this is the main area of reduced brain activity in dyslexics while reading.
