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Related Concept Videos

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.
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.
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...
Parallel Processing01:20

Parallel Processing

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...
Perception01:28

Perception

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.
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...
The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.

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Related Experiment Video

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Neural computations underlying depth perception.

Akiyuki Anzai1, Gregory C DeAngelis

  • 1Dept. of Brain and Cognitive Sciences, Center for Visual Science, University of Rochester, NY 14627, United States.

Current Opinion in Neurobiology
|May 11, 2010
PubMed
Summary
This summary is machine-generated.

Neural mechanisms for depth perception involve distinct cortical processing stages. Early areas handle depth order, intermediate areas gauge depth intervals, and higher areas represent 3D shape.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • Depth perception is crucial for navigating and interacting with the 3D world.
  • Understanding the neural basis of depth perception is a key challenge in neuroscience.
  • Existing research suggests a hierarchical processing of visual information in the brain.

Purpose of the Study:

  • To review the neural mechanisms underlying depth perception.
  • To delineate the computational goals related to depth perception: depth order, depth intervals, and 3D surface/object representation.
  • To map these computational goals to distinct stages of cortical processing.

Main Methods:

  • Review of accumulating evidence from neuroscience research.
  • Analysis of studies investigating neural processing in early, intermediate, and higher cortical visual areas.
  • Examination of neuronal encoding of surface geometry and population-level representation of 3D shape.

Main Results:

  • Depth ordering is associated with early visual areas.
  • Depth intervals, quantified by relative disparities, are likely processed in intermediate cortical stages.
  • 3D surface geometry and object shape are processed in higher cortical areas, with specific neuronal populations encoding this information.

Conclusions:

  • The processing of depth perception is distributed across different stages of the visual cortex.
  • Distinct neural mechanisms support depth ordering, interval gauging, and 3D shape representation.
  • Further research is needed to understand the integration of these processes into a unified 3D percept.