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. Author manuscript; available in PMC: 2009 Jun 12.
Published in final edited form as: Neuroscience. 2008 Feb 5;154(1):127–138. doi: 10.1016/j.neuroscience.2008.01.036

Figure 1.

Figure 1

Minimum latencies of VCN neurons separated into chopper, primarylike (including pri-notch), and onset categories, as shown in the legend. Minimum latency is the latency at which the histogram of first-spikes during a tone burst first deviates from spontaneous activity. The latencies have not been corrected for a 0.55 ms acoustic delay in the sound system (Young et al., 1988). Solid and dashed lines are vertically shifted versions of the AN group delay function defined by Goldstein et al. (1971): τG = 1.25[1 + (6 / fBF)2]1/4 where τG is the delay in ms and fBF is the BF in kHz. The vertical shift is 0.55 ms (solid line), corresponding to the acoustic delay, and 1.55 ms (dashed line). The dashed line separates primarylike and chopper neurons, except for a few cases. In those cases, the classification was unequivocal based on the PST histogram and regularity.