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. 2011 Nov 1;214(21):3619–3629. doi: 10.1242/jeb.056101

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Fig. 3. — Latency between noise offset and call onset for the different noise conditions. Data shown are means ± s.e.m. (N=8 subjects). Statistically significant differences with Bonferroni correction are indicated by an asterisk (*P<0.05). (A) Comparison of the latency for the different noise conditions. Data shown are for the periodic 2 s, 4 s and 8 s, aperiodic predictable (pred.) and aperiodic unpredictable (unpred.) conditions. The latency between all pairs of condition was significantly different except for predictable vs unpredictable and periodic 4 s vs unpredictable. (B) Comparison of the coefficient of variation of the latency for the different noise conditions. (C) Comparison of the latency following a 2, 4 and 8 s noise pulse in the aperiodic predictable conditions. These data were regrouped from aperiodic sequences, i.e. all calls initiated in 2 s silent intervals were grouped together, etc. Repeated-measures ANOVA showed a significant difference in mean following a 2, 4 and 8 s noise pulse (F_2,14=14.806, P<0.001; Mauchly's W=0.715, P=0.365). Paired t-test results: 2 s vs 4 s (t₇=7.35, P<0.001), 2 s vs 8 s (t₇=13.76, P<0.001), 4 s vs 8 s (t₇=6.44, P<0.001). Shapiro–Wilk normality test results: 2 s (W=0.959, P=0.804), 4 s (W=0.977, P=0.946), 8 s (W=0.923, P=0.456). Levene's test (F=3.2493, P=0.06) indicates equal variance. (D) Latency for calls made in the aperiodic: unpredictable session plotted against the preceding noise pulse length. Repeated-measures ANOVA showed significant differences between call latencies (F_2,14=13.623, P<0.001; Mauchly's W=0.417, P=0.072). The mean latency did not significantly vary for 2 and 4 s noise pulses (latency=4 s) but was significantly lower following an 8 s noise pulse (latency=2.3 s). Paired t-test results: 2 s vs 4 s (t₇=0.0112, P=0.914), 2 s vs 8 s (t₇=6.25, P<0.001), 4 s vs 8 s (t₇=5.31, P<0.001). Shapiro–Wilk normality test results: 2 s (W=0.823, P=0.051), 4 s (W=0.904, P=0.31), 8 s (W=0.921, P=0.44). Levene's test (F=1.6503, P=0.2159) indicates equal variance.