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Comparison of the changes in snout poking responding between the first 5-session block of the Operant Level phase (Block 1) and the second 5-session block of the Operant Level phase (Block 2). The left column of Figure 1 shows within-session responding during the Operant Level phase plotted in 8-min epochs. The right column shows habituation rate. Asterisks indicate significant p < .05.
