A Driving Simulation Study on Visual Cue Presented in the Peripheral Visual Field for Prompting Driver’s Attention

Abstract

This paper proposes a method for prompting drivers’ spatial attention by presenting visual cue in their peripheral visual field. Computer-generated images of forward-facing driving scenes were projected on a screen 6 m wide and 1.8 m high, with a 140° viewing angle. The gaze movement of subjects was measured when hazardous events were presented, such as cardboard boxes collapsing onto the road or a child running out into the road. The task defined for the subjects was to detect visual cue presented in their central visual field while observing the driving scene in front of them. A preceding visual cue was presented in the right and left visual fields, at a visual angle of 10° to 40°, for 1–5 s in advance of the visual cue presented in the center of the visual field. The detection time for the visual cue in the central visual field was then measured. The results of the experiments conducted with six subjects revealed two types of gaze movement patterns with respect to a hazardous event. In one type, the subjects broadly captured the overall scene without shifting their gaze markedly; in the other type, the subjects sequentially scanned the scene and fixed their gaze on the hazardous event when it occurred. The former type tended to be seen in subjects with long driving experience. It was also found that presenting visual cue in the peripheral visual field quickened recognition of the visual cue in the central visual field. By varying the viewing angle at which the preceding cue was presented in the peripheral visual field and the time interval between the presentation of the preceding cue and the detection cue in the central visual field, conditions were found for assisting prompt detection of the latter visual cue.