Figure 2.

Responses of workers belonging to three threshold classes (LOW, MID, HIGH) to the quality of two options (3.5% and 4.0% sucrose solutions). The black horizontal line indicates the median. Boxes delimit the first and third quartiles, and whiskers show the range. An asterisk indicates a significance level of p < 0.05. (a) Significant differences were not observed in the number of workers arriving at each option in each class. (b) Significant differences were observed only in the numbers of workers responding to the sucrose concentrations in the MID class. (c) The proportion of responding workers among the arriving workers was significantly different only in the MID class.