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Color Vision

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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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Related Experiment Video

Updated: Apr 28, 2026

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache

Published on: June 2, 2014

Afterimage duration differs for migraine with or without aura.

Florian Rimmele¹, Julia Teuber¹, Britta Müller²

¹Department of Neurology, Headache Centre North-East, Rostock University Medical Centre, Rostock, Germany.

|March 28, 2025

Summary

This summary is machine-generated.

Migraine with aura (MwA) patients exhibit significantly prolonged afterimage duration compared to healthy controls and migraine without aura (MwoA) patients. This finding suggests altered visual processing in MwA, potentially linked to subcortical or cortical excitability.

Keywords:

afterimage headache migraine palinopsia

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Area of Science:

Neuroscience
Ophthalmology
Neurology

Background:

The role of afterimages in migraine pathophysiology remains unclear.
Investigating visual phenomena alterations in migraine patients is crucial.

Purpose of the Study:

To compare afterimage duration in migraine with aura (MwA), migraine without aura (MwoA), and healthy controls (HCs).
To explore the influence of stimulus color and habituation on afterimage duration in migraine patients.

Main Methods:

Cross-sectional study involving adults diagnosed with MwA, MwoA, or no headache history.
Afterimage duration was measured using standardized protocols.
Collected data included patient demographics, comorbidities, and psychosocial factors.

Main Results:

MwA patients showed significantly longer afterimage duration (12.6s) than HCs (5.5s).
No significant difference in afterimage duration was observed between MwoA patients (7.7s) and HCs.
Stimulus color did not significantly affect afterimage latency.

Conclusions:

Significantly prolonged afterimage duration is characteristic of MwA, not MwoA.
Findings suggest subcortical and/or cortical modulation in MwA, possibly due to increased neural excitability.
Afterimage duration may serve as a biomarker for MwA.