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Overall percentage preference for the larger reinforcer (%B) when delays to both levers (A and B) were set to 0 s in all blocks of trials. B>A denotes phase 7, where the reinforcer sizes were the same as in the previous 6 phases (B = 100 μl, A = 50 μl); B<A denotes phase 8 where the reinforcer sizes where switched. Columns show group mean data; vertical bars indicate SEMs.
