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Figure 5


Fig. 5. Experiment III. The results bars are located under the corresponding colour in the chromatic space shown at the top (binominal test; **P<0.01). The black vertical line corresponds to the neutral point. Two horses were trained on positive green stimulus (red `+') and negative grey stimulus (black `–'). (A) Both horses reached high choice levels for the training combination. (B) In tests with the positive green stimulus and a novel yellow stimulus (red circle) no significant difference could be seen. (C) In tests with the negative grey stimulus and a novel blue stimulus (red ring) both horses preferred the negative grey stimulus corresponding to the longest wavelength in the combination.





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