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Mean (± s.e.m.) time spent (sec) on the LiCl- and saline-paired sides of the CPA apparatus during the pre-conditioning session (pre), the first post-conditioning test session (1) and all tests after the three week hiatus (3–8) in ad libitum fed (n=12; top) and food-restricted (n=12; bottom) rats. Testing continued until the food-restricted group satisfied extinction criterion (sessions 4–8 as indicated by horizontal bracket).
