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Individual preferences for each stimulus-paired context (a) and mean time (min) spent in each stimulus-paired context (b) during the post-conditioning test session(s) by virgin females. Immediately prior to the start of the test session, females were given an intra-VTA microinjection containing 2% bupivacaine (striped bars) or saline solution (solid bars); all control females were handled but no microinjections were administered (open bars).
