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Related Experiment Videos

Response selection modulates visual search within and across dimensions.

Karen Mortier1, Jan Theeuwes, Peter Starreveld

  • 1Department of Cognitive Psychology, Vrije Universiteit, Van der Boechorststraat 1, 1081 BT Amsterdam, Netherlands. k.mortier@psy.vu.nl

Journal of Experimental Psychology. Human Perception and Performance
|June 29, 2005
PubMed
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Knowing the target dimension in feature search tasks improves performance. This suggests attentional guidance effects may occur later in processing than previously thought.

Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Attention Studies

Background:

  • Uncertainty regarding the target dimension in feature search tasks impairs performance.
  • This impairment is typically linked to inefficient attentional guidance.
  • Previous research often attributed these costs to early top-down attentional modulation.

Purpose of the Study:

  • To investigate the impact of target dimension predictability on search and nonsearch tasks.
  • To determine if cross-dimensional costs in attention are specific to search tasks.
  • To re-evaluate the timing of attentional guidance effects.

Main Methods:

  • Participants performed feature search and nonsearch tasks.
  • Target stimuli varied in one or across multiple dimensions.

Related Experiment Videos

  • Response times were measured under conditions of known and unknown target dimensions.
  • Trial-by-trial cueing was employed to manipulate predictability.

    • Main Results:

    • Predicting the target dimension significantly reduced response times in both search and nonsearch tasks.
    • Similar effects of predictability were observed regardless of whether participants were searching or responding to isolated targets.
    • Cueing improved performance on a trial-by-trial basis, mirroring the effects of pre-knowledge.

    Conclusions:

    • The findings indicate that the benefits of knowing the target dimension are not exclusive to search tasks.
    • These results challenge the notion that cross-dimensional costs solely arise from early attentional modulation.
    • It is proposed that these effects may reflect processes occurring later in cognitive processing.