Visual information and perceptual style in time-to-collision estimation

CAVALLO ; BERTHELON ; MESTRE ; POTTIER

Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
CAVALLO ; BERTHELON ; MESTRE ; POTTIER
Résumé / Abstract
An experiment is presented which aim was to determine the kind of visual information used in anticipating rear-end collisions, according to the visual information available in the road environment and the perceptual style of the driver. 9 field independent and 7 field dependent subjects had to judge time-to-collision under various visual and spatio-temporal conditions. Results showed that only under poor visual conditions (presence of the obstacle alone) were temporal estimates affected by approach speed, obstacle distance and actual time-to-collision. Under these conditions the estimates appeared to be mainly based on static depth cues (angular size). The enrichment of the visual scene (texture) allowed the processing of motion-based information (optical flow) and made the estimates independent of spatio-temporal conditions; variability, overshoots and subjective difficulty were reduced. Whereas both field-dependent and independent observers took global visual changes into account, only field-independent subjects were able to use local motion as well. The findings suggest that multiple sources of information play a part in time-to-collision judgments.

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