The proposal is a longitudinal study of potential neurobiological and neurobehavioral markers of disease onset and progression in pre-symptomatic individuals who have the CAG expansion in the HD gene. A total of 500 subjects will be enrolled. Study subjects will be 30 to 55 years old and have a parental history of Huntington's disease. The study will enroll 425 cases with >39 CAG repeats (affected), and 75 controls with . . . (supplement)

As clinical neuroscience rapidly progresses, mental disorders are increasingly explained in terms of biological mechanisms (e.g., depression is caused by chemical imbalances). The proposed project will examine (i) whether laypeople and practicing clinicians are open to such biological explanations, (ii) how biological explanations impact opinions about mental disorders among clinicians and those who display symptoms, and (iii) how negative effects of biological accounts can be reduced.

Advances in psychiatric genetics are likely to offer major diagnostic and therapeutic benefits, but also legal and social-related risks, to individuals who were diagnosed with, or have a proclivity for, psychiatric disorders. In response, courts and policy-makers will have to ensure that psychiatric genetic data are used to promote, and not to obstruct, equality, justice, and social inclusion.