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Related Concept Videos

Vision01:24

Vision

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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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Parallel Processing01:20

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Visual System01:26

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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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Depth Perception and Spatial Vision01:15

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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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Photoreceptors and Visual Pathways01:22

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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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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Using Looming Visual Stimuli to Evaluate Mouse Vision
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Ageing and visual spatiotemporal processing.

Karin S Pilz1, Marina Kunchulia, Khatuna Parkosadze

  • 1School of Psychology, University of Aberdeen, William Guild Building, Aberdeen, Scotland, UK, k.s.pilz@abdn.ac.uk.

Experimental Brain Research
|May 21, 2015
PubMed
Summary
This summary is machine-generated.

Individual differences in visual ageing impact vernier acuity and backward masking. Some older adults show deficits suggesting cortical, not retinal, causes, differentiating visual ageing from schizophrenia.

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Area of Science:

  • Vision science
  • Neuroscience
  • Gerontology

Background:

  • Ageing significantly impacts visual functions, including acuity and processing speed.
  • Understanding individual variations in visual ageing is crucial for accurate research and clinical applications.

Purpose of the Study:

  • To investigate the effects of ageing on vernier acuity and backward masking using the shine-through paradigm.
  • To differentiate between retinal and cortical causes of visual deficits in older adults.
  • To assess the relationship between visual ageing and schizophrenia, challenging the early brain ageing hypothesis.

Main Methods:

  • Healthy older adults (>60 years) were divided into two groups based on vernier duration performance compared to younger adults.
  • Backward masking and complex masking gratings were employed within a shine-through paradigm.
  • Visual functions including vernier acuity, backward masking, and spatial-temporal vision were assessed.

Main Results:

  • Backward masking was impaired in older adults with poorer vernier duration (Older Adults 2) but not in those with comparable performance (Older Adults 1).
  • Older Adults 2 exhibited deficits in spatial and temporal vision, independent of visual acuity, suggesting cortical involvement.
  • Schizophrenia was found not to be a form of early ageing in the visual domain based on masking paradigms.

Conclusions:

  • Individual differences in visual processing significantly influence ageing effects on vision.
  • Visual deficits in some older adults stem from cortical changes rather than retinal issues.
  • The visual domain does not support the hypothesis of schizophrenia as early brain ageing.