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(A) Training protocol, Experiment 4. (B) Animals extinguished 10 min after acquisition (EXT) show significantly reduced fear-potentiated startle relative to animals given equivalent context exposure without nonreinforced light presentations (CTX), and they do not exhibit reinstatement following unsignaled shock presentations. Shown are mean (+/− SEM) fear-potentiated startle difference scores. Significant differences (P < 0.05) are indicated by an asterisk.
