Fig. 3: Results of the control experiment (phase 1 and phase 2).

Results of the control experiment (phase 1 and phase 2). This figure shows the pattern of results (Phase 1 and 2) examining the fish’s preference to respond to targets that also provide a food pellet for an empty side (two pellets) versus targets that provide the same reward for the acting fish but do not provide food for the other side (one pellet). a–c show the fish raw data, with each graph representing a different fish. Both Y axes represent the proportion of target selection. The X-axis represents the number of the session. The middle line represents 50% chance. The left side of each graph represents the first phase, where the yellow bars represent the proportion of preference for the dual events resulting in two food pellets (1/1) and the blue bars represent the proportion of preference for the single event, resulting in one food pellet (1/0). In the second phase the color mapping was reversed. The bars add up to 1. d represents a summary across all fish for each target type selection (i.e., dual events, single event). Error bars represent one standard error. The data points represent the average preference of each fish in each condition. Over all, no significant preference emerged for the dual events when there was no fish on the other side of the partition.