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Median discrimination indices (closed circles) and quartiles (upper and lower lines) of bees tested for discrimination after tactile conditioning (experiment 2). There were no significant differences in the discrimination indices of the four different groups. The numbers of bees in each group are: nurse bees 6–13 days, 27; foragers 6–13 days, 28; nurse bees >15 days, 27; foragers >15 days, 20.
