Accession Number : ADA263642

Title :   Effects of Location Cuing on Redundant Target Processing.

Descriptive Note : Final rept.,

Corporate Author : INSTITUTE FOR PERCEPTION RVO-TNO SOESTERBERG (NETHERLANDS)

Personal Author(s) : Theeuwes, J.

Report Date : 06 JAN 1993

Pagination or Media Count : 15

Abstract : The present study is concerned with the redundancy gain: the observation that subjects respond faster to simultaneously presented redundant targets than to single targets. This finding is usually interpreted as evidence for parallel, self-terminating, unlimited capacity processing. Alternatively, it has been claimed that the reaction time advantage with redundant targets is simply due to spatial uncertainty under single-target conditions. The present study tested this hypothesis. Subjects responded when one, two or three Letter Es were presented, and refrained from responding when one, two or three letter Fs were presented. On half of the trials, Location uncertainty was eliminated by presenting a line segment at one of the Locations of the subsequently appearing target letters. The results reject the alternative spatial uncertainty explanation: even when the Location of the impending target is cued in advance, there is no attenuation of the redundancy gain.... Reaction time, Vision. s

Descriptors :   *CUEING, *TARGETING, *LOCATORS, ATTENUATION, GAIN, OBSERVATION, REACTION TIME, REDUNDANCY, STOPPING, TARGETS, TIME, UNCERTAINTY, VISION.

Subject Categories : Target Direction, Range and Position Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE