what is supranuclear palsy
progressive supranuclear palsy psp is an uncommon brain disorder that affects movement control of walking gait and balance speech swallowing vision mood and behavior and thinkinghat is progressive supranuclear palsy progressive supranuclear palsy psp is an uncommon brain disorder that affects movement control of walking gait and balance speech swallowing vision mood and behavior and thinking the disease results from damage to nerve cells in the brain