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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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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Prosopagnosia01:24

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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Vision Training Methods for Sports Concussion Mitigation and Management
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Temporal visual processing deficits in post concussion syndrome.

Davide Frattini1, Mariagrazia Benassi2, Tobias Wibble3

  • 1Department of Clinical Neuroscience, Karolinska Institutet, Eugeniavägen 12, Solna, 171 64, Sweden. Davide.frattini@ki.se.

Scientific Reports
|October 15, 2025
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Summary
This summary is machine-generated.

Post-concussive syndrome (PCS) alters visual temporal processing, increasing perceptual noise and affecting motion detection. While some recovery occurs over time, persistent visual abnormalities highlight the need for interventions targeting neural noise.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Post-concussive syndrome (PCS) commonly involves motion hypersensitivity.
  • Visual processing, particularly temporal resolution, may be affected by mild traumatic brain injury (mTBI).

Purpose of the Study:

  • To investigate alterations in visual temporal resolution thresholds in PCS patients.
  • To determine if PCS impacts motion detection psychophysical measures.

Main Methods:

  • Fifteen PCS patients and 15 controls underwent critical flicker fusion (CFF) threshold assessments at various visual-field eccentricities.
  • Generalized linear mixed models analyzed group differences in CFF thresholds, with CFF variability as a covariate.
  • Pupil measurements and catch trials controlled for alertness and fatigue.

Main Results:

  • PCS patients exhibited significantly higher CFF thresholds due to increased CFF variability compared to controls.
  • Visual-field eccentricity did not significantly modulate CFF thresholds.
  • Time since injury negatively correlated with CFF variability, suggesting temporal stabilization.

Conclusions:

  • PCS-related motion hypersensitivity may stem from disrupted visual temporal processing and altered neural noise.
  • Persistent visual processing abnormalities in PCS warrant further research into early clinical interventions.
  • While some compensatory recalibration occurs, underlying deficits in perceptual noise regulation persist.