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Mean (±SE) unconditioned response amplitude (UMA) from the first block of training, startle percentage from (1) session 1 (S1), and (2) the terminal acquisition (TA) session, number of sessions to criterion, and conditioned response (CR) percentage for sessions 1 and 2 taken from rats initially trained on post-natal day (P) 17 or 24 from acquisition training for Experiments 1 and 2
