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Related Concept Videos

Vision01:24

Vision

60.1K
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.
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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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Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Persuasion Strategies01:52

Persuasion Strategies

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Researchers have tested many persuasion strategies, including the foot-in-the door and the door-in-the-face techniques, in a variety of contexts. Ultimately, the principles are effective in selling products and changing people’s attitude, ideas, and behaviors (Cialdini & Goldstein, 2004).
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What is a Sensory System?01:31

What is a Sensory System?

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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Predator-Prey Interactions02:39

Predator-Prey Interactions

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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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Related Experiment Video

Updated: Feb 9, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
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Purchasing with vision.

R W Dearden

    Health Services Management
    |July 8, 1991
    PubMed
    Summary
    This summary is machine-generated.

    The new National Health Service (NHS) introduces a critical new role for providers as purchasers. This analysis details six essential functions purchasers must master for effective healthcare management.

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    Area of Science:

    • Healthcare Management
    • Health Services Research
    • Public Health Policy

    Background:

    • The introduction of the new National Health Service (NHS) has created new responsibilities for healthcare providers.
    • A significant shift involves the emergence of providers in the role of purchasers within the NHS framework.

    Purpose of the Study:

    • To identify and outline the critical functions of purchasers in the new NHS.
    • To provide a framework for understanding the essential tasks for effective healthcare purchasing.

    Main Methods:

    • Conceptual analysis of the evolving role of providers in the NHS.
    • Identification of key functional areas for healthcare purchasers.

    Main Results:

    • The role of purchaser is identified as a new and critical function for NHS providers.
    • Six inter-related functions essential for successful healthcare purchasing have been outlined.

    Conclusions:

    • Mastering these six functions is crucial for providers acting as purchasers in the new NHS.
    • Effective purchasing is key to navigating the opportunities and tasks presented by the new NHS structure.