Objective: To investigate the relationship between temporal discrimination threshold (TDT) and "off" period gait freezing (OGF) in patients with fluctuating Parkinson disease (PD).
Methods: TDT values were measured at the dorsum of the toes in 11 control subjects and 22 patients with PD with a wearing-off phenomenon (16 patients with OGF and 6 patients without OGF).
Results: During the l-dopa "off" period, TDT values increased abnormally in both patient groups but were significantly higher in patients with OGF than in those without OGF. A positive correlation was found between the severity of OGF and TDT values measured by different point stimulation. In patients with OGF, a single dose of l-dopa treatment normalized TDT values and ameliorated OGF.
Conclusions: Dopa-responsive abnormal discriminative sensory processing may be a possible cause of "off" period gait freezing observed in patients with fluctuating Parkinson disease.