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Effects of conditioning on percentage freezing during acclimation (a), startle amplitude (b), and percentage freezing during 10 s before startle probes (c). Difference scores of posttest minus pretest are shown (means ± SD) for ANX (n = 10) and CTRL (n = 7) groups. *Significantly higher than CTRL (t test). #Significantly higher than CTRL noise-alone. $Significantly higher than CTRL tone–noise (ANOVA with Tukey's post hoc tests, p < 0.05).
