Influence of M level on ELAR latency

The latencies of the various ELAR responses were compared using 2-way ANOVAs for M levels versus duration of deafness. For either waves N1, P2, or interval N1-P2, were latencies significantly influenced by the M levels (respectively F = 0.67, df = 1, p = 0.42; F = 1.34, df = 1, p = 0.25; F = 0.43, df = 1, p = 0.52). No significant interactions with deafness duration were found for neither N1 (F = 0.18, df = 1, p = 0.68), P2 (F = 0.61, df = 1, p = 0.44), nor interval N1-P2 (F = 1.14, df = 1, p = 0.29). ANOVAs’ normality test passed for analysis about wave N1 (p = 0.13), wave P2 (p = 0.026), and interval N1-P2 (p = 0.092), while the equal variance test passed for waves N1 (p = 0.054), P2 (p = 0.058), and interval N1-P2 (p = 0.073). Figure 5 shows latencies of N1 (a), P2 (b), and interval N1-P2 (c) averaged across subjects and electrodes as a function of the two groups of M levels. Figure 6 displays latency plotted against M level for each stimulation site for wave N1 (a), wave P2 (b), and interval N1-P2 (c).

Figure 5. Mean latencies of ELAR waves N1 (a), P2 (b), and interval N1-P2 (c) averaged across subjects and electrodes within four groups of M levels (ML) indicated in abscissa. Group M1: 0 CU < ML ≤ 122 CU; group M2: 122 CU < ML ≤ 272 CU. Vertical bars denote the standard error around each mean.
Figure 5. Mean latencies of ELAR waves N1 (a), P2 (b), and interval N1-P2 (c) averaged across subjects and electrodes within four groups of M levels (ML) indicated in abscissa. Group M1: 0 CU < ML ≤ 122 CU; group M2: 122 CU < ML ≤ 272 CU. Vertical bars denote the standard error around each mean.
Figure 6. Mean latencies of waves N1 (a), P2 (b), and N1-P2 (c) averaged across subjects for each electrode as a function of M level. Vertical bars denote the standard error around each mean. Electrode numbers are indicated next to each point.
Figure 6. Mean latencies of waves N1 (a), P2 (b), and N1-P2 (c) averaged across subjects for each electrode as a function of M level. Vertical bars denote the standard error around each mean. Electrode numbers are indicated next to each point.