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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

264
Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
264
Perceptual Constancy01:12

Perceptual Constancy

479
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...
479
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

785
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
785

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Related Experiment Video

Updated: Aug 7, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

482

Theta phase coherence in visual mismatch responses involved in access processing to visual awareness.

Yuki Kurita1, Tomokazu Urakawa2, Osamu Araki1

  • 1Department of Applied Physics, Faculty of Science, Tokyo University of Science, Tokyo, Japan.

Frontiers in Human Neuroscience
|March 13, 2023
PubMed
Summary

The brain

Keywords:
binocular rivalryperceptual alternationtime frequency representation (TFR)unconsciousnessvisual mismatch negativity (vMMN)visual mismatch oscillatory responses (vMORs)

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Electrophysiology

Background:

  • Visual mismatch negativity (vMMN) reflects automatic visual change detection.
  • Previous work suggests vMMN relates to unconscious stimuli becoming consciously perceived.
  • Theta band oscillations are implicated in vMMN, but their role in conscious perception is unclear.

Purpose of the Study:

  • To investigate the role of theta band oscillations in visual mismatch processing and conscious perception.
  • To determine if theta band activity associated with vMMN contributes to access processing.

Main Methods:

  • Analysis of event-related spectral perturbation (ERSP) and inter-trial phase coherence (ITPC) in the theta band.
  • Correlation analysis with perceptual alternation rates in binocular rivalry.
  • Utilized an experimental paradigm with unconsciously presented deviant stimuli.

Main Results:

  • Increased theta band inter-trial phase coherence (ITPC) correlated with facilitated perceptual alternation for unconsciously presented deviant stimuli.
  • No significant correlation was found between event-related spectral perturbation (ERSP) and perceptual alternation.

Conclusions:

  • Theta phase coherence, underlying visual mismatch processing, appears relevant to conscious access processing.
  • Findings suggest a specific role for neural synchrony in bridging unconscious visual events to conscious awareness.