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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.
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...
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.
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...
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

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Related Experiment Video

Updated: Jul 4, 2026

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

Early automatic and late lateralised top-down mechanisms for 3D perception.

Joshua P Matthews1, Paloma Marí-Beffa2, Debra L Mills2

  • 1School of Psychology, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK; School of Psychology and Sport Science, Bangor University, Penrallt Road, Bangor LL57 2AS, UK.

Biological Psychology
|July 2, 2026
PubMed
Summary

Investigating three-dimensional (3D) shape perception, this study found that depth information automatically captures attention. Subsequent 3D shape processing engages left-hemisphere attentional mechanisms, challenging previous hypotheses.

Keywords:
3D ShapeAttentionDepth perceptionEvent-related potentialsLaterality

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Three-dimensional (3D) perception from two-dimensional (2D) retinal input is crucial for vision.
  • Early depth perception is pre-attentive, while later 3D shape processing involves top-down attention.
  • Hemispheric lateralization in 3D shape processing remains largely unexplored.

Purpose of the Study:

  • To investigate the neural correlates of attention to 3D shape using the N2pc component.
  • To test the hypothesis that 3D shape processing recruits greater attentional resources, lateralized to the right hemisphere.
  • To explore the role of automatic and top-down attention in 3D shape perception.

Main Methods:

  • Utilized the N2pc component, a marker of visual attention, to measure neural activity.
  • Compared electrophysiological responses to 3D versus 2D shape targets.
  • Analyzed early lateralized potentials (N1pc) for automatic attentional capture.

Main Results:

  • 3D targets elicited a greater N2pc amplitude than 2D targets, indicating increased attentional allocation.
  • This attentional effect for 3D shape processing was unexpectedly lateralized to the left hemisphere.
  • An early lateralized potential (N1pc) showed a polarity reversal, suggesting automatic capture by task-irrelevant depth cues.

Conclusions:

  • Depth information automatically captures attention, even when task-irrelevant.
  • Subsequent 3D shape processing relies on left-lateralized top-down attentional mechanisms.
  • Findings suggest the left ventral visual pathway's dominance in processing 3D shape.