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Related Concept Videos

Visual Agnosia01:12

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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...
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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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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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Updated: Jun 3, 2025

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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Imageless imagery in aphantasia revealed by early visual cortex decoding.

Shuai Chang1, Xinyu Zhang2, Yangjianyi Cao2

  • 1Key Laboratory of Brain, Cognition and Education Sciences, Ministry of Education, School of Psychology, South China Normal University, Guangzhou 510631, China; State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou 510060, China.

Current Biology : CB
|January 11, 2025
PubMed
Summary
This summary is machine-generated.

Individuals with aphantasia show distinct neural patterns in the early visual cortex during mental imagery attempts. Their brain activity differs from controls, challenging established links between visual cortex activity and conscious experience.

Keywords:
MVPAaphantasiaearly visual cortexfMRImental imageryvisual awareness

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Early visual cortex activity is linked to conscious experience and mental imagery.
  • Aphantasia, the complete absence of visual imagery, presents a unique case to study these relationships.
  • The neural basis and qualia associated with mental imagery in aphantasia remain largely unknown.

Purpose of the Study:

  • To investigate brain activity in the primary visual cortex during attempted mental imagery in individuals with and without aphantasia.
  • To compare univariate and multivariate blood-oxygen-level-dependent (BOLD) signals between groups.
  • To explore the relationship between neural signatures, perception, and conscious experience in aphantasia.

Main Methods:

  • Analysis of univariate (amplitude) and multivariate (decoding) BOLD signals in the primary visual cortex.
  • Comparison of brain activity during attempted mental imagery between individuals with validated aphantasia and control groups.
  • Cross-decoding analysis between neural signatures and perceptual representations.

Main Results:

  • Mental imagery content was decodable in both groups.
  • Neural signatures in aphantasia were ipsilateral and not cross-decodable with perception, unlike controls.
  • The perception-induced BOLD response was reduced in individuals with aphantasia compared to controls.

Conclusions:

  • Individuals with aphantasia exhibit distinct, potentially transformed, neural representations in the primary visual cortex during imagery.
  • These findings suggest that primary visual cortex activity may not always result in sensory qualia.
  • The study challenges traditional models of visual imagery and its neural correlates.