Studying auditory discrimination in children and the role it plays in acquiring language skills is of great importance. Also the relationship between articulation disorder and the ability to discriminate the speech sound is an important topic for speech and language researchers.Previous event- related potentials (ERPs) studies have suggested a possible participation of the visual cortex of the blind subjects were asked to discriminate 100 couple Farsi words (auditory discrimination tack) while they were listening them from recorded tape.The results showed that the blinds were able to discriminate heard material better than sighted subjects. (Prro.05)According to this study in blind subjects conical are as normally reserved for vision may be activated by other sensory modalities.This is in accordance with previous studies. We suggest that auditory cortex expands in blind humans.