LAUSR

We previously described on -state freezing of gait ( on -FOG) as a rare gait phenotype in Parkinson ’ s disease (PD). 1 In on -FOG cases, levodopa dosage increases were associated with corres-ponding increases of freezing of gait (FOG), whereas FOG dis-appeared in the off state. Two of 4 cases we described in 2012 1 were subsequently diagnosed as the predominant parkinsonian subtype of progressive supranuclear palsy (PSP-P). Based on these we hypothesized on -FOG might be a red fl atypical in the earlier detection of we searched patient databases at to identify with observed on -FOG. We identi fi ed a total of 8 on -FOG cases from approximately 8200 clinical records and referrals within a 7-year period.