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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.
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Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...
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Related Experiment Video

Updated: Jun 23, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

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Published on: August 1, 2018

The monkey ventral premotor cortex processes 3D shape from disparity.

Olivier Joly1, Wim Vanduffel, Guy A Orban

  • 1Lab Neuro-en Psychofysiologie, K.U. Leuven, Medical School, Campus Gasthuisberg, Herestraat 49, B-3000, Leuven, Belgium.

Neuroimage
|April 21, 2009
PubMed
Summary
This summary is machine-generated.

This study reveals how the monkey brain processes 3D object shapes using binocular disparity. Key areas like TEs, AIP, and F5a are involved in analyzing stereoscopic vision for grasping.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Object recognition and grasping rely on processing three-dimensional (3D) visual information.
  • While canonical neurons in ventral premotor cortex (F5) show shape selectivity, depth structure selectivity in frontal cortex remains under-investigated.

Purpose of the Study:

  • To investigate 3D shape processing using binocular disparity in the awake monkey brain.
  • To identify brain regions sensitive to depth structure derived from stereoscopic cues.

Main Methods:

  • Utilized contrast-agent enhanced functional magnetic resonance imaging (fMRI) in awake monkeys.
  • Presented stimuli with varying depth structures (curved vs. flat, fronto-parallel surfaces) to assess neural responses.

Main Results:

  • Identified depth structure sensitivity from disparity in infero-temporal cortex (TEs) and a rostral sector of ventral premotor cortex (F5a).
  • Observed 2D shape sensitivity within F5a, suggesting processing of complete 3D object information.
  • Confirmed depth structure sensitivity in AIP, consistent with prior research.

Conclusions:

  • A distributed network including TEs, AIP, and F5a analyzes stereoscopic 3D shape information.
  • Area F5a may process complete 3D shapes, potentially reflecting canonical neuron activity.
  • This network is crucial for the visual control of grasping actions.