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Related Concept Videos

Color Vision

Color Vision

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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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Published on: November 8, 2012

Color Compensation in Anomalous Trichromats Assessed with fMRI.

Katherine E M Tregillus¹, Zoey J Isherwood², John E Vanston²

¹Department of Psychology, University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557, USA; Department of Psychology, University of Minnesota, Twin Cities, 75 E River Road, Minneapolis, MN 55455, USA.

Current Biology : CB

|December 16, 2020

Summary

Congenital color vision deficiency, or anomalous trichromacy, can be compensated by neural plasticity. This brain adaptation in early visual cortex enhances color signals, making vision more vibrant despite receptor deficits.

Keywords:

adaptation anomalous trichromacy attention color blindness color vision color vision deficiency compensation early visual cortex fMRI plasticity

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Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis

Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis

Published on: June 20, 2012

Area of Science:

Neuroscience
Vision Science
Genetics

Background:

Anomalous trichromacy is a common inherited color vision deficiency affecting red-green hues.
Previous studies suggested post-receptoral signal amplification in anomalous trichromats, but relied on subjective data.
Direct neural evidence for compensatory mechanisms in color vision deficiency was lacking.

Purpose of the Study:

To directly investigate neural amplification in the visual cortex of individuals with anomalous trichromacy.
To determine if the brain compensates for reduced cone photopigment sensitivity.
To identify the location of potential neural compensation in the visual pathway.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
Cortical responses were recorded in color-anomalous individuals and normal controls.
Color contrast response functions were assessed across different tasks to control for attention.

Main Results:

Anomalous trichromats showed reduced chromatic responses in primary visual cortex (V1).
In later visual areas (V2v and V3v), chromatic responses were similar between anomalous and normal observers.
This indicates a compensatory gain adjustment occurring in early visual cortex.

Conclusions:

The brain exhibits neural plasticity to compensate for initial deficits in color receptor signals.
This compensation occurs in early visual cortical areas, specifically V2v and V3v.
These findings provide direct evidence for neural mechanisms that enhance color perception in anomalous trichromacy.