We are interested in investigating the functional brain abnormalities of height phobia. Subjects will be have a functional MRI scan before and after a course of treatment with behavioral therapy.

The purpose of this study is to investigate the effects of in vivo exposure therapy on the functional brain activity of subjects with height phobia using a fear provocation paradigm. We expect differential activation of the fear circuitry in height phobics compared to non-phobic controls, and that successful behavioral therapy will normalize the heightened fear response in height phobia.

Inclusion Criteria:

• Specific phobia of Heights

Exclusion Criteria:

• History of medical problems