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давали три бутылки . On each trial, subjects smelled sets of three bottles (two containing one odorant, the third containing its chiral opposite) and selected the odd stimulus. Before conditioning, discrimination accuracy was at chance (33%) for both CS+ and CS– enantiomer pairs, confirming that each pair was initially indistinguishable (Fig. 2A). After conditioning, behavioral accuracy for distinguishing between tgCS+ and chCS+ rose by more than a factor of 2, significantly exceeding both chance and preconditioning performance (Ps > 0.01; Wilcoxon test, two-tailed), without any improvement in distinguishing between CS– and chCS–. discrimination accuracy was at chance (dashed line) for CS+ and CS– pairs before conditioning, but selectively improved for the CS+ pair after conditioning. Error bars, ±SEM. картинка должна быть видна и без регистрации. http://www.sciencemag.org/content/vol319/issue5871/images/large/319_1842_F2.jpeg