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Does size rescaling require central attention?

Michael Tombu1, Pierre Jolicoeur

  • 1Department of Psychology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1. mt2tombu@cgl.uwaterloo.ca

Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Experimentale
|March 21, 2002
PubMed
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Object size rescaling in shape-matching tasks demands central attention resources. This capacity-demanding process requires cognitive resources, as demonstrated by the size ratio effect in a psychological refractory period paradigm.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Attention Studies

Background:

  • The shape-matching task is a common paradigm for studying visual perception.
  • Previous research suggests that visual processing can be influenced by attentional demands.

Purpose of the Study:

  • To investigate whether object size rescaling during a shape-matching task necessitates central attentional resources.
  • To determine if the size ratio effect is capacity-demanding.

Main Methods:

  • Utilized a psychological refractory period (PRP) paradigm with two tasks.
  • The first task involved a speeded auditory pitch judgment.
  • The second task required speeded same/mirror image judgments on pairs of polygons with varying size ratios, presented at different stimulus onset asynchronies (SOAs).

Related Experiment Videos

Main Results:

  • The size ratio effect on performance in the shape-matching task was found to be additive with the SOA.
  • This additive effect indicates that size rescaling is a capacity-demanding process.

Conclusions:

  • Object size rescaling in the shape-matching task requires central attentional resources.
  • The findings support the notion that visual perception, including size rescaling, competes for limited cognitive capacity.