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Mean percent freezing in Experiment 1 displayed for Pre (black) and No Pre (white) groups across Age (PND 17, 24, and 31) when trained with an Immediate shock (top) or one delivered after a 120s placement-to-shock interval (bottom). Bars represent standard errors of the mean. Facilitation of conditioning by context pre-exposure was only observed on PND 24 and 31 for animals in the Immediate shock condition.
