Observing the patient rise from a chair and walk on heels and toes may expose subtle proximal or distal weakness. Tandem walking (heel to toe) may elicit subtle ataxia. A motor ataxic gait is characterized by broad-based, unsteady steps. Sensory ataxia with loss of proprioception may be notable for abrupt movements and slapping of the feet with each impact. A senile gait that is slow, broad based, and with a shortened stride may be seen with aging, but also with neurodegenerative disease such as Parkinson disease and normal pressure hydrocephalus. Parkinson disease may also show a festinating gait that is narrow-based, with small shuffling steps that become more rapid. Peroneal muscle weakness causes foot drop, known as an equine gait.