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Effect of interelectrode distance on system controllability in the presence of electrode shift. TAC test failure rates (a) and completion times (b) for tests conducted with electrodes at the no shift and 2 cm shift locations for interelectrode distances of 2 cm and 4 cm using TD features. Results are averaged over seven subjects with one outlier at the no shift location removed. Two longitudinal channels were used for controllability testing. Error bars show+/− 1 SEM.
