Describe symptoms of Parkinson's disease, HIV-associated neurocognitive disorder, and Huntington's disease.How do these forms of neurocognitive disorder differ from Alzheimer's disease?

Parkinson's Disease

A progressive nervous system disorder that affects movement, often including tremors.

HIV-associated Neurocognitive Disorder

A spectrum of cognitive, motor, and/or behavioral impairments caused by HIV infection and its effects on the brain.

Huntington's Disease

A genetic disorder that causes the progressive breakdown of nerve cells in the brain.