The effects of location cuing on redundant-target processing
โ Scribed by Jan Theeuwes
- Book ID
- 104779492
- Publisher
- Guilford Publishing Inc
- Year
- 1994
- Tongue
- English
- Weight
- 520 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0340-0727
No coin nor oath required. For personal study only.
โฆ Synopsis
The present study is concerned with the redundany 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. In Experiment 1, subjects responded when one, two, or three letters E were presented, and refrained from responding when one, two, or three letters F were presented. In half of the trials, location uncertainty was eliminated by presentation of 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. Experiment 2 served as a control experiment and showed a clear redundancy gain, even in conditions in which it was ensured that, before display onset, attention was directed to a location of one of the impending targets.
๐ SIMILAR VOLUMES
For a steady-state process the accuracy of reconciled data may he measured by the trace of its covariance matrix of estimation errors. Quantitative relations are derived for the effects of adding and removing single measurements on estimation accuracy. It is proved that redundancy will never adverse