Figure 4.

Screenshots and data visualizations of Experiment 2

(A) Screenshots of the videos (at 2.0 s; left: Ball; right: Fur ball).

(B) Time series plot showing the dogs’ median (black line) and mean horizontal gaze coordinates (±se, dotted line and the dark gray shaded area around it; in px) in the test trials. The shaded yellow area represents the moving stimulus.

(C) Time series plot showing dogs' pupil size (in arbitrary units and baseline corrected). The orange and blue lines show the mean pupil size (±se, shaded area around the line) in the Constant and Variable condition. The continuous vertical lines show the times when stimulus changes direction; the dashed vertical lines delimit periods when the ball was not moving in the Variable condition. The left facets show the Ball and right facets the Fur ball conditions.