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Network dynamics underlying alterations in apparent object size.

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  • 1Research Center of Brain and Cognitive Neuroscience, Liaoning Normal University, Dalian 116029, China.

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Summary
This summary is machine-generated.

The Ebbinghaus illusion demonstrates how surrounding context affects perceived size. This study reveals that top-down signals from the precuneus to visual areas are crucial for conscious perception of apparent object size.

Keywords:
DCMEbbinghaus illusionfMRIfeedback projection

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • The Ebbinghaus illusion, where context circles alter perceived target size, involves both early and high-level visual processing.
  • The precise interaction between these visual regions in generating the illusion remains incompletely understood.

Purpose of the Study:

  • To investigate the neural network mechanisms underlying the Ebbinghaus illusion.
  • To explore how manipulating attention affects the neural processing of illusory size perception.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) to measure brain activity.
  • Employed dynamic causal modeling (DCM) to analyze effective connectivity within neural networks.
  • Manipulated participants' focus of attention on specific illusory configurations.

Main Results:

  • Behavioral data confirmed the Ebbinghaus illusion.
  • fMRI activity in the extrastriate cortex correlated with perceived size (larger activation for apparently larger circles).
  • Reduced self-inhibition in the extrastriate cortex and increased feedback connectivity from the precuneus to the extrastriate cortex were observed.

Conclusions:

  • Apparent object size representation is modulated by feedback projections from higher-level to lower-level visual areas.
  • Top-down signaling plays a critical role in conscious visual perception and the generation of visual illusions like the Ebbinghaus effect.