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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Learn Behav. 2016 Mar;44(1):59–66. doi: 10.3758/s13420-015-0190-1

Figure 4.

Figure 4

Active lever presses during Testing. Mean active lever presses (±SEM) of rats given access to either water or sucrose in either the home cage (Home) or operant conditioning chamber (Operant) during the 17-h exposure period. Rats that underwent 30 days of forced abstinence made significantly more active lever presses than rats tested immediately after training. Rats housed in the operant chamber during the exposure period were found to make significantly fewer active lever presses than rats housed in their home cage, regardless of length of forced abstinence. * Main effect of forced-abstinence period, p < 0.0001. # Main effect of housing condition, p < 0.0001.