Manipulation check
In the first manipulation check, 23 out of 32 dogs approached the tunnel containing the transparent screen first. Which were significantly more dogs than expected by chance (p = 0.020, 95% CI: [0.53; 0.86]).
Looking times
Looking times to transparent and opaque
When the experimenter looked at the tunnel containing the transparent screen, dogs looked significantly longer at the bucket behind the tunnel containing the transparent screen than when the experimenter looked at the tunnel containing the opaque screen (X2 = 6.25, p = 0.012). Contrary, the dogs’ looking times to the bucket behind the tunnel with the opaque screen was not significantly modulated by the experimenter’s direction of looking (X2 = 3.79, p = 0.052).
Gaze congruent looking times
Dogs’ gaze congruent looking times were not significantly modulated by the looking condition (i.e., whether the experimenter looked to the opaque or transparent tunnel; X2 = 0.12, p = 0.724)
First look
First look to transparent and opaque
When the experimenter looked at the tunnel containing the transparent screen, dogs looked significantly more often first at the bucket behind the tunnel containing the transparent screen than when the experimenter looked at the tunnel containing the opaque screen (χ2 = 7.58, p = 0.006). Dogs did not look significantly more often first at the bucket behind the tunnel containing the opaque screen than when the experimenter looked at the tunnel containing the transparent screen (χ2 = 3.63, p = 0.057).
First gaze congruent look
Dogs did not follow the gaze of the experimenter significantly more often when the experimenter looked to the transparent screen than when she looked to the opaque screen (X2 = 0.26, p = 0.613).