a the numbers of correct responses (i.e. nosepokes to the bottle with sucrose) were corrected for numbers of nosepokes to the bottle with tap water located in the same corner (used as a covariate, significant at p<0.001).
b the numbers of licks the bottle with sucrose were corrected for numbers of licks to the bottle with tap water located in the same corner (used as a covariate, significant at p<0.001).