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Related Concept Videos

Perception01:28

Perception

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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.
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...
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Perceptual Constancy01:12

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Parallel Processing01:20

Parallel Processing

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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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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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Factors Affecting Perception01:25

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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
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Cross-Modal Multivariate Pattern Analysis
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Perceptual Priors Update Contextual Feedback Processing in V1.

Yulia Y Lazarova1,2, Yingying Huang1,2, Lars F Muckli1,2

  • 1Centre for Cognitive Neuroimaging, School of Psychology and Neuroscience, College of Medical, Veterinary and Life Sciences, University of Glasgow.

Topics in Cognitive Science
|July 21, 2025
PubMed
Summary
This summary is machine-generated.

Prior knowledge improves visual recognition by refining predictive processing in the brain. Learning about images, even general categories, enhances feedback signals in early visual areas, aiding perception of ambiguous stimuli.

Keywords:
Cortical feedbackInternal modelsMooney imagesVisual perceptionfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Contextual information and prior knowledge significantly influence perceptual processing, enabling recognition of degraded visual inputs.
  • Neuronal processing of identical sensory data varies with context, aligning with predictive processing models where higher brain areas generate predictions for sensory interpretation.
  • Cortical feedback signals transmit predictions to sensory areas, suggesting knowledge acquisition refines internal models and improves sensory estimation accuracy.

Purpose of the Study:

  • To investigate how acquired knowledge modulates contextual feedback processing in the primary visual cortex (V1).
  • To determine if general category knowledge or specific image information impacts feedback signals in response to ambiguous visual stimuli.
  • To explore the role of internal models in resolving sensory ambiguities through top-down modulation.

Main Methods:

  • Utilized Mooney images, ambiguous two-tone stimuli, to assess recognition thresholds without prior knowledge.
  • Conducted two behavioral experiments and one functional magnetic resonance imaging (fMRI) study.
  • Participants acquired either general category or specific information about Mooney images; fMRI used partially occluded images to examine feedback modulation in V1.

Main Results:

  • General knowledge of image categories was sufficient to enhance the recognition of ambiguous Mooney images.
  • Perceptual priors incorporating image-specific information modulated contextual feedback processing in early visual areas.
  • Previously ambiguous images showed altered feedback signal processing after knowledge acquisition.

Conclusions:

  • Acquiring knowledge, even general category information, improves the ability to recognize ambiguous visual stimuli.
  • Specific perceptual priors dynamically modulate feedback mechanisms in early visual cortex.
  • Predictive processing models are supported by evidence showing knowledge-driven refinement of feedback signals in visual perception.