Table 1.

Change in time-to-peak at different ISIs

Peak no.ISI (ms)C–F time-to-peak difference (ms)Range (ms)
P1 (n = 15)30.08 ± 0.010.04–0.15
40.06 ± 0.010.02–0.10
50.03 ± 0.010.00–0.08
80.01 ± 0.01−0.01 to 0.02
100.00 ± 0.01−0.01 to 0.02
200.00 ± 0.01−0.01 to 0.00
P2 (n = 15)30.37 ± 0.030.21–0.66
40.23 ± 0.030.12–0.44
50.16 ± 0.020.07–0.31
80.07 ± 0.010.01–0.13
100.04 ± 0.01−0.02 to 0.08
200.00 ± 0.01−0.07 to 0.02
P3 (n = 11)30.62 ± 0.070.27–1.02
40.40 ± 0.040.17–0.65
50.27 ± 0.030.15–0.47
80.15 ± 0.020.07–0.32
100.09 ± 0.010.03–0.15
200.02 ± 0.01−0.05 to 0.11
  • Stimulus pulses were presented as pairs, the first and second eliciting a cardinal (C) and follower (F) CAP, respectively. The C–F difference for each ISI is the mean ± SEM of the differences between the time-to-peak of the P1, P2, and P3 peaks in the C and F CAPs recorded from each of the indicated number of optic nerves.