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. 2009 Apr 15;276(1667):2597–2604. doi: 10.1098/rspb.2009.0040

Figure 2.

Figure 2

The relative difference between outcomes experienced during differential conditioning affected the strength of a learned, olfactory bias. The graphs are comparisons of the olfactory response functions towards a gradient of binary odours produced during a test period after conditioning with two perceptually similar binary odours associated with different outcomes. In each graph, the dotted/dashed lines indicate the response functions from figure 1 (dotted line= CS+1.0 M sucrose and CS−1.0 M NaCl; dashed line=CS+1.0 M sucrose only); the axes are also the same as those in figure 1. The solid lines in each graph represent the response functions produced by differential conditioning with: (a) CS+ reinforced with 1.0 M sucrose containing 0.01 M proline and the CS− reinforced with 1.0 M salt (N=31); (b) the CS+ reinforced with 1.0 M sucrose and the CS− without reinforcement (CS−) (N=64); and (c) the CS+ reinforced with 1.0 M sucrose and the CS− reinforced with 0.3 M sucrose (N=59).