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Related Concept Videos

Perceptual Constancy01:12

Perceptual Constancy

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.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...

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Steady-state measures of visual suppression.

Daniel H Baker1, Greta Vilidaite2, Alex R Wade1

  • 1Department of Psychology and York Biomedical Research Institute, University of York, York, United Kingdom.

Plos Computational Biology
|October 13, 2021
PubMed
Summary
This summary is machine-generated.

Visual system neurons suppress different stimulus properties via distinct pathways. Gain control mechanisms, particularly contrast gain, appear to unify these suppression routes, potentially by filtering unreliable sensory inputs.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Neuronal suppression occurs in the early visual system, affecting stimulus properties like orientation, eye-of-origin, and spatial location.
  • These different types of suppression are hypothesized to involve distinct anatomical pathways.
  • Understanding the underlying gain control mechanisms is crucial for deciphering visual processing.

Purpose of the Study:

  • To investigate whether different suppression pathways in the human visual system can be distinguished by their gain control patterns.
  • To differentiate between contrast gain and response gain effects on neuronal contrast response functions.

Main Methods:

  • Utilized steady-state electroencephalography (EEG) in human participants.
  • Performed a computational meta-analysis of 16 previous studies.
  • Conducted two new experiments using four types of visual masks (monocular/dichoptic overlay, aligned/orthogonal surround) and sine wave gratings.

Main Results:

  • Meta-analysis showed evidence for contrast gain with overlaid masks, but inconclusive results for other mask types.
  • New experiments revealed strong evidence for contrast gain at the occipital pole across all four mask types at 5Hz.
  • Suppression effects increased at lateral electrode sites, with limited evidence for response gain at 5Hz, but both gain types were observed at 10Hz.

Conclusions:

  • Despite distinct anatomical pathways, visual suppression mechanisms likely share a common functional purpose.
  • Gain control processes, particularly contrast gain, appear to play a unifying role in suppressing less reliable neural inputs.
  • Findings contribute to understanding how the visual system manages complex sensory information.