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A, electrodes chronically implanted with anode cephalad to cathode (n = 8). B, electrodes chronically implanted with cathode cephalad to anode (n = 8). Pulse widths were 130 μs (PW130), 250 μs (PW250), 500 μs (PW500) or 750 μs (PW750). * P < 0.0005 PW130 vs. all other pulse widths; † P < 0.003 PW250 vs. PW500 or PW750.
