It conveys sounds of words but not meanings. It is an arch-shaped bundle that connects Wernicke's area and Broca's area. Damage results in conduction aphasia. Researchers suggest that people with conduction aphasia can repeat words only if they are spelled regularly. Aphasia in deaf people results in an inability to lipread, and is caused by damage to the right hemisphere, which is involved in recognizing faces.
Surface dyslexia involves a deficit in phonetic reading.
People with phonological dyslexia will have difficulty reading function words. Researchers who examined the brains of deceased people with developmental dyslexia found abnormalities in the corpus callosum. Researchers have noted a relationship between developmental dyslexias, right-handedness, and muscular coordination. Dyslexics have trouble with spatial perception and of movements in space. Differences have been recorded in the primary visual cortex of dyslexics.