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The authors present developmental evidence that contextual fear conditioning is supported by a short-term memory system that supports conditioning immediately after a shock and by a long-term memory system that supports contextual conditioning 24 hr after training. This is based on the finding that after 1 conditioning trial, rats 18 to 32 days old show the same amount of conditioned freezing when tested immediately after conditioning but 18-day-old rats show much less conditioned freezing thandoi:10.1037/0735-7044.108.2.227 fatcat:h7uvz4vg5fc5ncdow5tn7qtsuq