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Mean (± s.e.m.) time spent (sec) on the morphine- and saline-paired sides of the CPP apparatus during the pre-conditioning session (pre), the first post-conditioning test session (1) and all tests after the three week hiatus (2–9) in ad libitum fed (n=9; top) and food-restricted (n=9; bottom) rats. Testing continued until the ad libitum fed group satisfied extinction criterion (sessions 6–9 as indicated by horizontal bracket).
