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Polarity effect (PE, TP-C–TP-A) for individual participants and averaged across seven participants for whom the PE was measured at two electrodes (far right), in dB. Dark and light gray bars show the PE measured at the most apical and a mid-array electrode, respectively. The 0-dB baseline represents no difference between thresholds measured for TP-C and TP-A pulse trains. Negative values indicate good estimated neural health.
