In naïve and 200μA:100μs groups, the percent of area of primary auditory cortex responding to 8–16 kHz, 50 dB tones was similar to the percent area of primary auditory cortex responding to 1–2 kHz, 50 dB tones. In subjects receiving 200μA:500μs or 800μA:100μs VNS, the responsiveness of A1 shifted towards 8–16 kHz, 50 dB tones. N = 10, 10, 9, & 7 for Naïve, 200μA:100μs, 200μA:500μs, & 800μA:100μs groups, respectively. * = P < 0.05; ** = P < 0.01.