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Related Concept Videos

Color Vision01:24

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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Pigmentation01:19

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The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
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The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Changes in Skin Color: Clinical Perspectives01:14

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The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
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Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Related Experiment Video

Updated: May 1, 2026

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients
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Empirical evidence for unique hues?

J M Bosten, A E Boehm

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |April 4, 2014
    PubMed
    Summary

    This study challenges the concept of unique hues, finding that perceived color categories are not fixed. Instructions significantly influence how people identify unique colors like red, green, blue, and yellow.

    Area of Science:

    • Color perception
    • Visual psychology
    • Psychophysics

    Background:

    • Unique hues (red, green, blue, yellow, white) are traditionally considered distinct from other colors.
    • Existing behavioral evidence supports the separation of unique hues from intermediate colors.

    Purpose of the Study:

    • To investigate the validity of unique hues by challenging existing behavioral evidence.
    • To examine the influence of experimental conditions and instructions on the identification of unique hues.

    Main Methods:

    • Experiment 1: Hue scaling with unique (red, green, blue, yellow) and non-unique (teal, purple, orange, lime) color primaries.
    • Experiment 2: Investigated the effect of instructional wording on unique hue settings.

    Main Results:

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    • Hue scaling results were largely equivalent between unique and intermediate color conditions.
    • Altering instructions to include intermediate color terms significantly shifted unique hue identification.

    Conclusions:

    • The findings question the distinctness and fixed nature of unique hues.
    • Subjective perception and instructional cues play a significant role in identifying unique colors.