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Related Experiment Video

Updated: Mar 9, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Dynamic representations of visual space for perception and action.

W Pieter Medendorp1, Anouk J de Brouwer2, Jeroen B J Smeets3

  • 1Radboud University, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|December 28, 2016
PubMed
Summary
This summary is machine-generated.

Visual illusions impact both perception and action, challenging the strict separation of the ventral (what) and dorsal (how) visual streams. Our findings suggest a shared visual representation for both tasks.

Keywords:
IllusionsParietalSaccadesSpatial updatingfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The division of labor between the ventral (perception) and dorsal (action) visual streams is a key topic in neuroscience.
  • The What & How pathway model proposes distinct roles, but functional specialization remains debated.
  • Contextual visual illusions are thought to differentially affect perception and action.

Purpose of the Study:

  • To investigate the functional separation between the ventral and dorsal visual streams.
  • To test whether visually-guided actions are immune to visual illusions.
  • To examine the role of presentation time in visuomotor processing and updating.

Main Methods:

  • Behavioral experiments using single and double saccade paradigms.
  • Presentation of visual contextual illusions.
  • Analysis of saccade amplitude and perceptual judgments.
  • Neuroimaging (fMRI or similar) to identify neural correlates.

Main Results:

  • Illusion presentation time similarly affected saccade amplitude and perceptual judgments.
  • Visuomotor updating was demonstrably influenced by illusory context.
  • Neuroimaging data revealed neural correlates in dorsal stream areas.

Conclusions:

  • The findings challenge absolute functional specialization of visual processing streams.
  • A dynamic, common visual representation may drive both perception and action.
  • Visuomotor processing and perception share common mechanisms influenced by visual context.