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Related Experiment Video

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

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Published on: April 16, 2014

Shape processing area LO and illusory contours.

Lee H de-Wit1, Robert W Kentridge, A David Milner

  • 1Department of Psychology, Science Site, Durham University, South Road, Durham DH1 3LE, UK.

Perception
|October 13, 2009
PubMed
Summary
This summary is machine-generated.

Illusory contours activate the primary visual cortex, but require the shape processing area LO to influence behavior. This highlights the role of LO in visual perception and illusions.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Functional MRI studies show illusory contours activate the primary visual cortex (V1).
  • The role of V1 computations versus feedback from higher-level areas, like visual area LO, in processing illusory contours remains debated.

Observation:

  • A patient with bilateral lesions to visual area LO but a functionally intact V1 was studied.
  • This patient's ability to perceive or be influenced by illusory contours was assessed.

Findings:

  • Illusory contours did not influence the patient's behavior, despite V1 being functional.
  • This indicates that visual area LO is crucial for the behavioral effects of illusory contours.

Implications:

  • The findings suggest that illusory contours depend on shape representation computations within area LO.
  • This research underscores the importance of neuropsychological studies in differentiating feedforward and feedback mechanisms in visual processing and illusions.