Stimuli and apparatus
Gaze was measured with a Tobii T120 near infrared eye tracker (sampling rate = 60 Hz, accuracy
= 0.5 degrees, monitor size = 17 inches; Tobii, Stockholm, Sweden). The stimulus movie was
recorded from a live scene and edited in Adobe Premiere (Adobe Systems, San Jose, CA, USA). The final
movie (29.3 24.2 visual degrees) contained an everyday give-and-take interaction. The movie was