Learning disabilities, or LDs, are a range of learning difficulties, which may or may not have a clear physiological origin. As a result, most attempts at definition have been descriptive of the outward manifestations of the disabilities. Future research in the area of brain asymmetry may prove useful in pinpointing the physiological origin of LD. Even dyslexia, however, does not necessarily indicate a brain lesion as was once thought; perhaps brain asymmetry will help us to look in other areas.
The social significance of LD and the special educational needs of these students are surveyed. The most prevalent recent models of LD learning have employed an information processing metaphor. The LD student processes perhaps smaller chunks of