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Related Concept Videos

Vision01:24

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Parallel Processing01:20

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Perception01:28

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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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Cross-Modal Multivariate Pattern Analysis
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Shape perception simultaneously up- and downregulates neural activity in the primary visual cortex.

Peter Kok1, Floris P de Lange1

  • 1Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Kapittelweg 29, 6525 EN Nijmegen, the Netherlands.

Current Biology : CB
|July 2, 2014
PubMed
Summary
This summary is machine-generated.

Shape perception alters neural activity in the primary visual cortex (V1). It enhances activity where predictions align with no input and suppresses it where predictions match input, supporting generative models of perception.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Grouping local visual elements into shapes is crucial for perception.
  • Neural activity modulation in the primary visual cortex (V1) during shape perception is debated, with studies reporting both increases and decreases.

Purpose of the Study:

  • To investigate the nature of neural modulation in V1 during illusory shape perception.
  • To test the hypothesis that feedback in generative models of perception can be suppressive or enhancing based on input congruence.

Main Methods:

  • Population receptive field mapping was used to quantify neural activity in V1.
  • The spatial profile of neural activity was analyzed during the perception of illusory shapes.

Main Results:

  • Shape perception increased V1 neural activity in areas with receptive fields on the shape but no bottom-up input.
  • Shape perception suppressed V1 activity in areas receiving bottom-up input that matched predictions.
  • These modulations were independent of task demands.

Conclusions:

  • Shape perception modifies V1 representations in a specific and automatic way.
  • Findings support hierarchical generative models of perception where feedback influences sensory representations.