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(A) Comparisons of PPI (%) across 29 participants under the four conditions. (B) Comparisons of control startle reactivity (no prepulse) across 29 participants under two masking conditions. (C) Comparisons of separation-induced PPI enhancement across 29 participants under two masking conditions. Formula: separation-induced PPI enhancement = PPI separation—PPI co-location. Data are expressed using mean ± SEM. *, p < 0.05, **, p < 0.01.
