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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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"...
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.
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.
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.
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...

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Related Experiment Video

Updated: May 8, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Auditory-visual localization in hemianopia.

Jörg Lewald1, Robert W Kentridge, Sören Peters

  • 1Department of Cognitive Psychology, Faculty of Psychology, Ruhr University Bochum.

Neuropsychology
|August 14, 2013
PubMed
Summary
This summary is machine-generated.

Patients with hemianopia (HA) experience distorted visual space perception. They perceive aligned sounds and lights when the visual target is shifted toward the blind side, suggesting visual space compression.

Related Experiment Videos

Last Updated: May 8, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Area of Science:

  • Neuroscience
  • Visual Perception
  • Spatial Cognition

Background:

  • Hemianopia (HA) is a visual field defect resulting from brain damage, often causing visual field loss.
  • Beyond visual field loss, HA patients may have altered perception of horizontal visual space, but the nature of these distortions is debated.
  • Understanding spatial distortions in HA is crucial for rehabilitation and understanding visual processing.

Purpose of the Study:

  • To quantify the geometric distortions in the visual representation of horizontal space in patients with hemianopia.
  • To investigate how hemianopia affects the perceived spatial relationship between visual and auditory stimuli.

Main Methods:

  • Tested patients with pure left or right hemianopia (without neglect).
  • Experiment 1: Patients aligned a visual stimulus with an auditory target.
  • Experiment 2: Patients aligned an auditory stimulus with a visual target.

Main Results:

  • In both experiments, hemianopic patients perceived spatial alignment when the visual stimulus was physically displaced towards the anopic (blind) hemifield.
  • This indicates a consistent deviation in perceived spatial alignment between visual and auditory stimuli.
  • The visual stimulus was perceived as shifted towards the anopic side relative to the sound's actual position.

Conclusions:

  • The results suggest that visual positions are perceived as shifted towards the intact hemifield in hemianopia.
  • This leads to a perceived compression of visual space on the ipsilesional (intact) side compared to the contralesional (anopic) side.
  • The findings challenge previous assumptions about auditory localization biases and highlight significant visual spatial distortions in hemianopia.