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Related Concept Videos

The Retina01:32

The Retina

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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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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Vision01:24

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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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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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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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Perception01:28

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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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Related Experiment Video

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Characterization of a Novel Human Organotypic Retinal Culture Technique
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How we perceive our own retina.

Kuno Kirschfeld1

  • 1Max-Planck-Institute for Biological Cybernetics, Spemannstrasse 41, 72076 Tuebingen, Germany kuno.kirschfeld@tuebingen.mpg.de.

Proceedings. Biological Sciences
|October 27, 2017
PubMed
Summary

Investigating subjective perception and neural activity, this study reveals that brain areas directly processing retinal input must represent the retina without distortion and realize size constancy for accurate visual perception.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • The relationship between subjective perception and neural activity remains a significant challenge since the 17th century.
  • Previous neuroscience research utilized perceptual suppression in the visual system to identify temporally correlated neural activity with perception.
  • However, temporal correlation alone is insufficient to prove direct causation of perception by neural areas.

Purpose of the Study:

  • To introduce a novel method for investigating the neural basis of visual perception.
  • To demonstrate that brain areas directly involved in retinal perception must represent the retina without distortion.
  • To show that the phenomenon of size constancy is realized within these critical neural areas.

Main Methods:

Keywords:
neural activityperceptionretina

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  • The study employs a novel methodological approach distinct from traditional perceptual suppression paradigms.
  • It focuses on the representational properties of neural areas processing retinal input.
  • Analysis involves assessing the fidelity of retinal representation and the implementation of size constancy.

    • Main Results:

    • Neural areas directly contributing to the perception of one's own retina must maintain an undistorted representation of retinal information.
    • The phenomenon of size constancy, a key aspect of visual perception, is demonstrated to be a function of these specific neural areas.
    • This provides stronger evidence for the causal role of these areas in subjective visual experience.

    Conclusions:

    • The findings necessitate that neural representations of sensory input are spatially accurate for direct perceptual processing.
    • Size constancy is not merely a perceptual phenomenon but is neurally instantiated in areas with precise retinal topography.
    • This research offers a new framework for understanding the neural underpinnings of subjective experience and visual processing.