Fig 6. Longer Lh significantly decreases and delays the peak of the sound-evoked CAPs of SGN fibers.
(A) Sound-evoked CAPs of SGN fiber populations of varying heminode length Lh at 70dB SPL, averaged over 50 simulations. Shaded regions correspond to the standard error of the mean and dashed lines correspond to the peaks of each CAP, labeled with the same colors as the CAPs. The decreased peak amplitude and increased latency of CAP peak were significant for populations with Lh > 2 μm. (B) Comparison of CAP measures of each population relative to the normal Lh (Lh = 1 μm) at 70 dB SPL. CAP latencies were significantly higher for populations with Lh>1 μm and peak amplitudes were significantly lower for populations with Lh>2 μm. The increases in widths were only minimal (*p<0.05, **p<0.01, #p<0.001). (C) Normalized CAP amplitudes exhibited an exponential increase and the decreases in CAP amplitudes of populations with Lh>2 μm were more pronounced for higher sound levels. (D) The latencies of CAP peaks increased with higher Lh for all sound levels and decreased along the sound levels.