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Related Concept Videos

Vision01:24

Vision

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.
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
Taste Buds and Receptors01:20

Taste Buds and Receptors

Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
Color Vision01:24

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.
Visual Agnosia01:12

Visual Agnosia

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 end"...

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Related Experiment Video

Updated: Jun 20, 2026

Visualizing Visual Adaptation
04:43

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The effect of target scarcity on visual foraging.

A E Hughes1, H R Statham2, A D F Clarke1

  • 1Department of Psychology, University of Essex, Colchester, UK.

Royal Society Open Science
|December 5, 2024
PubMed
Summary

This study explored human visual foraging, investigating if people prefer scarce targets without explicit value. Results indicate no inherent scarcity bias in visual search behavior.

Keywords:
cognitive modellingforagingvisual search

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Area of Science:

  • Cognitive Psychology
  • Human Visual Perception
  • Decision Making

Background:

  • Human visual foraging strategies are influenced by target prevalence and value, with mixed findings in previous research.
  • Some studies suggest a bias towards high-value targets, even when scarce, while others report this bias diminishes with scarcity.

Purpose of the Study:

  • To investigate the presence of a scarcity bias in human visual foraging without explicit target value.
  • To test the hypothesis that participants would exhibit a scarcity bias based on commodity theory and implicit value.

Main Methods:

  • Utilized standard feature versus conjunction visual foraging tasks to examine scarcity bias.
  • Employed a Bayesian statistical model designed for predicting target-by-target foraging behaviors.

Main Results:

  • No evidence of a scarcity bias was found in the experimental results.
  • Participant behavior did not demonstrate an inherent preference for rarer targets.

Conclusions:

  • The findings suggest that humans do not inherently assign greater reward value to scarcer targets in visual foraging tasks.
  • This challenges the notion of an implicit scarcity bias influencing visual search strategies when explicit value is absent.