Gaze allocation in natural stimuli: Comparing free exploration to head-fixed viewing conditions

Autor(en): `t Hart, Bernard Marius
Vockeroth, Johannes
Schumann, Frank
Bartl, Klaus
Schneider, Erich
Koenig, Peter 
Einhaeuser, Wolfgang
Stichwörter: Attention; CAMERA; CONTRIBUTE; COORDINATION; Eye movements; FIXATIONS; Human; Natural stimuli; OBJECT; OVERT; Psychology; Psychology, Experimental; Real world; SACCADIC EYE-MOVEMENTS; SALIENCY; SELECTION; VISUAL-ATTENTION
Erscheinungsdatum: 2009
Volumen: 17
Ausgabe: 6-7
Startseite: 1132
Seitenende: 1158
oNaturalo gaze is typically measured by tracking eye positions during scene presentation in laboratory settings. How informative are such investigations for real-world conditions? Using a mobile eyetracking setup (oEyeSeeCamo), we measure gaze during free exploration of various in- and outdoor environments, while simultaneously recording head-centred videos. Here, we replay these videos in a laboratory setup. Half of the laboratory observers view the movies continuously, half as sequences of static 1-second frames. We find a bias of eye position to the stimulus centre, which is strongest in the 1 s frame replay condition. As a consequence, interobserver consistency is highest in this condition, though not fully explained by spatial bias alone. This leaves room for image specific bottom-up models to predict gaze beyond generic biases. Indeed, the osaliency mapo predicts eye position in all conditions, and best for continuous replay. Continuous replay predicts real-world gaze better than 1 s frame replay does. In conclusion, experiments and models benefit from preserving the spatial statistics and temporal continuity of natural stimuli to improve their validity for real-world gaze behaviour.
ISSN: 13506285
DOI: 10.1080/13506280902812304

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