Judging the contact-times of multiple objects: evidence for an early bottleneck
BAURES ; OBERFELD ; HECHT ; CAVALLO
Type de document
COMMUNICATION ORALE SANS ACTES (COM)
Langue
anglais
Auteur
BAURES ; OBERFELD ; HECHT ; CAVALLO
Résumé / Abstract
The accuracy of time-to-contact (TTC, that is the time remaining before an object reaches a specific point of interception) perception has been assessed at length for single approaching objects. However, little is known only about observers’ ability to make simultaneous TTC judgments for two or more objects (e.g., DeLucia & Novak, 1997). To investigate potential effects of added objects, the present studies put observers in a position to judge the TTC of two simultaneously moving objects. In a first experiment, participants judged the TTCs of two objects approaching a target line with different velocities and TTCs. In a second experiment, participants produced an absolute estimate of the TTC of only one of two objects, indicated by a tone. The target object was cued either at motion-onset, or at occlusion-onset. As a result, participants were required to estimate and report only one TTC in the motion-onset condition; but to estimate two but report only one TTC in the occlusion-onset condition. In both experiments, a single-object condition was introduced as a control condition. Perception of arrival time, intersection, multiple objects, gap acceptance
