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Figure 4. Electromyogram (EMG) response latency (milliseconds) for each muscle from distal to proximal (left to right) for transtibial amputee (TTA) group (gray circle, intact limb; white circle, prosthetic limb) and control group (black square) for each muscle (tibial is anterior [TA], gastrocnemius medial is [GM], vastus lateral is [VL], biceps femor is [BF]) and direction (Up, Down). Rusaw D, Hagberg K, Nolan L, Ramstrand N. Bilateral electromyogram response latency following platform perturbation in unilateral transtibial prosthesis users: Influence of weight distribution and limb position. J Rehabil Res Dev. 2013;50(4):531–44.http://dx.doi.org/10.1682/JRRD.2012.01.0017