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The Crossmodal Congruency Task as a Means to Obtain an Objective Behavioral Measure in the Rubber Hand Illusion Paradigm
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Visual illusions modify object size estimates for prospective action judgements.

Laurie Geers1, Mauro Pesenti2, Michael Andres2

  • 1Psychological Sciences Research Institute, Université catholique de Louvain, Place Cardinal Mercier 10, Louvain-la-Neuve, Belgium.

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|June 9, 2018
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Summary
This summary is machine-generated.

The eyes guide actions based on object size, but visual context and body posture influence this process. This study shows that illusions and hand movements affect grasping judgments, demonstrating perception and action support each other.

Keywords:
ActionDorsal streamEbbinghaus illusionMotor imageryMotor interferencePerception

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Motor Control

Background:

  • The perception-action model suggests visually-guided actions use egocentric object size estimates independent of visual context.
  • Previous studies on visual illusions and action have yielded conflicting results, potentially due to visual and proprioceptive feedback masking illusory effects.
  • The Ebbinghaus illusion, where perceived size is influenced by surrounding elements, provides a model to study context-dependent action guidance.

Purpose of the Study:

  • To investigate how the Ebbinghaus illusion affects prospective grasping judgments.
  • To examine the influence of concurrent motor tasks on action anticipation and size perception.
  • To determine if visual context and body posture interact in guiding actions.

Main Methods:

  • Participants judged their ability to grasp a central circle in an Ebbinghaus display without moving their hands.
  • A control group performed a standard size judgment task.
  • Experiments involved concurrent motor tasks: squeezing a ball or spreading fingers apart.

Main Results:

  • The Ebbinghaus illusion similarly affected both perceptual and grasping judgments.
  • Motor tasks interfered with grasping judgments: squeezing a ball led to underestimation, while spreading fingers led to overestimation of grasping ability.
  • The illusion modulated the motor task interference, with illusory largeness exacerbating underestimation.

Conclusions:

  • Visual context and body posture significantly influence action anticipation.
  • Perception and action are not independent but mutually supportive in guiding behavior.
  • The findings challenge the strict independence of egocentric size estimates in action guidance.