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Figure 2. Percent change of velocity and stride length due to training effect (A = condition 1, day 1 vs 14, no sensory feedback), combined device and training effects (B = condition 4, day 1 vs 14, sensory feedback), and combined training and immediate residual effects (C = condition 5, day 1 vs 14, no sensory feedback). Vertical bars denote standard error of the mean. Espay AJ, Baram Y, Kumar Dwivedi A, Shukla R, Gart-ner M, Gaines L, Duker AP, Revilla FJ. At-home training with closed-loop augmented-reality cueing device for improving gait in patients with Parkinson disease. J Reha-bil Res Dev. 2010;47(6):573–82 DOI:10.1682/JRRD.2009.10.0165