Fifty years of progressive supranuclear palsy.

The article presents brief information on progressive supranuclear palsy (PSP), a degenerative disease involving the gradual deterioration and death of specific volumes of the brain. It talks about physician John Clifford Richardson who states the disease extended beyond the motor system to include mental symptoms, personality changes and dementia. Topics discussed include natural history of disease, diogonostic criteria and rating scales, and neuropathological features of disease.