Virtual reality to assess visual attraction and perceived interest to daylit scene variations

Façades and light pattern composition have been shown to influence the spatial experience and physiological responses of humans [1,2]. The present study examines the effect of sunlight penetration and window size on fixations to the floor of the scene, and the relation between visual interest and fixations in an experiment using 360° scenes displayed in Virtual Reality. One hundred participants were shown the same daylit interior space with varying presence of sun patches (based on sky type and time-of-day variations) and window size in a mixed experimental design. Participants' head movements were recorded during the first 25 seconds of silent free-viewing exposure to each scene, after which they rated the visual interest of the scene. Fixation areas were derived from head movement data and were used to extract the percentage of fixations towards different areas in the scene. Linear Mixed Model (LMM) analyses showed that sun patch presence influenced the percentage of fixations towards both the front part of the floor (near the façade) and the whole floor. Pairwise comparisons showed that participants spent more time fixating towards the floor in the presence of small sun patch compared to no sun patch. Adding visual interest as a fixed factor in the LMM did not show a statistically significant relation between fixations towards the floor and visual interest ratings. Although limited to Virtual Reality and thus to its relatively small luminance range, these findings show that the presence of a sun patch in one's field of view elicits visual attraction.