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Related Concept Videos

Perceptual Constancy01:12

Perceptual Constancy

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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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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Gestalt Principles of Perception01:21

Gestalt Principles of Perception

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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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Visual Agnosia01:12

Visual Agnosia

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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...
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Factors Affecting Perception01:25

Factors Affecting Perception

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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Invisibility assessment: a visual perception approach.

Ivan Moreno, Y Jauregui-Sánchez, Maximino Avendaño-Alejo

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |November 18, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new metric to measure how well optical cloaks hide objects. This index uses the human visual system's sensitivity to spatial frequencies for accurate invisibility assessment.

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    Area of Science:

    • Optics and Photonics
    • Human Visual Perception
    • Metrology

    Background:

    • Assessing the effectiveness of optical cloaking technologies is challenging due to diverse mechanisms and performance variations.
    • A standardized metric is needed for comparing different invisibility techniques objectively.

    Purpose of the Study:

    • To propose a simple, quantitative metric for evaluating the perceived invisibility of optical cloaks.
    • To leverage the characteristics of the human visual system (HVS) for a more relevant assessment of cloaking performance.

    Main Methods:

    • Utilized the Fourier transform to analyze spatial frequency content.
    • Incorporated the contrast sensitivity function (CSF) of the HVS into the metric.
    • Developed a novel invisibility index based on HVS spatial frequency sensitivity.

    Main Results:

    • The proposed metric provides a quantitative measure of perceived invisibility.
    • The index correlates cloaking performance with the HVS's ability to detect spatial frequency variations.

    Conclusions:

    • The developed invisibility index offers a precise and HVS-relevant method for comparing optical cloaking techniques.
    • This metric aids in the advancement and standardization of invisibility research.