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Related Concept Videos

Visual System01:26

Visual System

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.
Once through the pupil, the light passes through the lens, a...
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.
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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.
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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
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.

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Related Experiment Video

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Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Vision: more than expected in the early visual system.

Cristopher M Niell1

  • 1Department of Biology and Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA. cniell@uoregon.edu

Current Biology : CB
|August 24, 2013
PubMed
Summary
This summary is machine-generated.

The standard model of visual processing is challenged by new findings showing orientation selectivity in mouse thalamic neurons. This research explores the origins and functions of these selective thalamic inputs in brain computation.

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Sensory Systems

Background:

  • The conventional understanding of visual processing posits that orientation tuning originates in the cortex from untuned thalamic inputs.
  • Recent evidence in mice suggests that orientation selectivity may be present earlier in the visual pathway, specifically within the thalamus.

Purpose of the Study:

  • To investigate the presence and characteristics of orientation-selective neurons in the mouse thalamus.
  • To identify the potential sources and developmental origins of thalamic orientation selectivity.
  • To explore the functional implications of these thalamic inputs for cortical processing.

Main Methods:

  • Electrophysiological recordings in vivo and in vitro to measure neuronal responses.
  • Anatomical tracing techniques to determine neuronal connectivity and origins.
  • Genetic or pharmacological manipulations to probe the necessity and function of thalamic selectivity.

Main Results:

  • Demonstration of orientation-tuned responses in specific populations of thalamic neurons in mice.
  • Identification of potential inputs or intrinsic mechanisms contributing to thalamic orientation selectivity.
  • Evidence suggesting that thalamic orientation selectivity influences cortical representations.

Conclusions:

  • Thalamic neurons in mice exhibit orientation selectivity, challenging the standard model of visual processing.
  • The findings highlight the thalamus as a potential site for early sensory feature extraction.
  • Understanding thalamic contributions is crucial for a complete model of cortical visual computation.