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The present study evaluated how gait in patients with Parkinson’s disease (PD) is influenced by the manipulation of different characteristics of step cues. Two groups – 22 participants with PD “on” dopaminergic medication, and 11 healthy age-matched controls – walked on a computerized carpet under four conditions: (i) self-paced walk (Baseline); (ii) lines on the ground (normal optic flow) (Ground...