OTHER DEFINITIONS
alexia -inability to read ( Council on Scientific Affairs, 1989).
agraphia -inability to write (Council on Scientific Affairs, 1989).
developmental auditory imperception – difficulty learning sounds, sound-symbol relationships and the meaning of words (Dyslexia informational packet, 1994).
dysphasia – difficulty learning both receptive and expressive oral language (Dyslexia informational packet, 1994).

SUB-CLASSIFICATIONS OF DYSLEXIA
dysphonetic –poor symbol-sound association (Council on Scientific Affairs, 1989).
dyseidetic –poor visual recognition (Council on Scientific Affairs, 1989).
linear dyslexia — poor visual tracking skills (Council on Scientific Affairs, 1989).
surface dyslexia — this is marked by the inability to read words by sight; these individuals read words only by sounding them out phonologically. This form of dyslexia is usually a result of a specific lesion in the posterior/parietal region in the brain (Rosenhan, et. al., 1989).
phonological dyslexia — this is marked by the inability to pronounce a written word that has never been seen, even if it corresponds to a spoken word that the individual already knows. There is damage to the system involved in reading by sound, typically as a result of a specific lesion in the posterior part of the left hemisphere (Rosenhan, et. al., 1989).