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Pixel asymmetry predicts between-object differences in the object-based compatibility effect.

Shaheed Azaad1, Simon M Laham2

  • 1Department of Cognitive Science, Central European University, Budapest, Hungary.

Quarterly Journal of Experimental Psychology (2006)
|July 25, 2020
PubMed
Summary
This summary is machine-generated.

Pixel asymmetry influences object-based compatibility effects (CEs). Objects with more pixels on the handle side yield larger CEs, and centrality interacts with object asymmetry to moderate these effects.

Keywords:
Spatial compatibilityaffordancesobject-based correspondence effect

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Area of Science:

  • Cognitive Psychology
  • Human-Computer Interaction
  • Visual Perception

Background:

  • Object-based compatibility effects (CEs) in manual response tasks are typically linked to grasp affordances.
  • Alternative explanations propose spatial compatibility effects, similar to the Simon effect, driven by object handle orientation.
  • Stimulus centrality and pixel asymmetry have been shown to influence CEs, potentially by altering spatial information.

Purpose of the Study:

  • To investigate the role of pixel asymmetry in between-object variations of object-based CEs.
  • To examine how both between-object and within-object (centrality) differences in pixel asymmetry interact to affect CEs.
  • To determine if pixel asymmetry can explain previously observed variations in object-based CEs.

Main Methods:

  • Experiment 1 (N=34): Assessed the relationship between between-object pixel asymmetry and object-based CEs.
  • Experiment 2 (N=35): Presented participants with images of mugs (low asymmetry) and frying pans (high asymmetry) under different centrality conditions (base-centered vs. object-centered).
  • Measured response times (RTs) to evaluate compatibility effects.

Main Results:

  • Between-object differences in pixel asymmetry predicted the magnitude of object-based CEs; greater asymmetry congruent with the handle led to larger CEs.
  • An interaction was found between between-object and within-object pixel asymmetry: base-centered stimuli showed conventional CEs, while object-centered stimuli showed negative CEs (NCEs).
  • The effect of stimulus centrality on CEs was modulated by the object's inherent asymmetry, being smaller for mugs than frying pans.

Conclusions:

  • Pixel asymmetry is a significant factor contributing to both between-object and within-object variations in object-based compatibility effects.
  • The spatial properties of object stimuli, specifically pixel distribution relative to fixation, play a crucial role in modulating motor responses.
  • Findings challenge purely grasp-based explanations and highlight the importance of visual spatial cues in object-based CEs.