Gait is observed for the following: Ignition failure (temporary freezing in place when starting to walk, followed by festination): Parkinson disease Apraxia, as when feet stick to the floor: Normal-pressure hydrocephalus or other frontal lobe disorders Festination: Parkinson disease Limb asymmetry, as when patients drag a leg, have reduced arm swing, or both: Hemispheric stroke Ataxia: Midline cerebellar disease Instability during turns: Parkinsonism Walking on the toes and heels is tested; distal muscle weakness makes these maneuvers difficult.