Figure 4.

Experiment 3: (A) PC1 (higher values indicate more workers entering the maze and arriving at the target cell and doing so faster) was higher in the third run than in the first run, indicating an intensifying level of foraging. (B) The same pattern, presented by worker arrivals at the target cell. (C) The effect of moving either the food or the blue light from the target cell to the opposite target cell in the fourth run. When the blue light was moved, more workers arrived at the opposite target cell, whereas when food was moved fewer workers arrived at the target cell. Medians, quartiles, the range, and all data points are presented. In three of the four treatments in (C) the median of the opposite-target arrivals is zero (and hence the orange column is absent).