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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"...
Preparedness and Phobias01:09

Preparedness and Phobias

Human fear responses to certain stimuli, such as darkness, heights, deep water, and blood, can often arise despite the absence of direct negative experiences. This phenomenon is rooted in evolutionary psychology, which posits that humans have developed a predisposition to fear stimuli that historically posed significant survival threats. This predisposition, known as preparedness, suggests that early humans who developed a fear of potentially dangerous entities, such as venomous snakes and...
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...
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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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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[How acrophobia impairs visual exploration and gait].

G Kugler1, D Huppert, E Schneider

  • 1Institut für Klinische Neurowissenschaften und Deutsches Schwindel- und Gleichgewichtszentrum (IFB LMU), Ludwig Maximilians Universität, Klinikum Großhadern, Marchioninistr. 15, 81377, München, Deutschland.

Der Nervenarzt
|September 24, 2013
PubMed
Summary

Visual height intolerance affects 28% of people, impairing daily life. Those affected show restricted visual exploration and cautious gait, increasing fall risk.

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Area of Science:

  • Psychology
  • Neuroscience
  • Biomechanics

Context:

  • Visual height intolerance (VHI) impacts 28% of the population.
  • Over 50% of individuals with VHI experience significant daily life and quality of life impairments.
  • Understanding the behavioral and motor responses to heights is crucial for public health.

Purpose:

  • To investigate the specific visual-motor behaviors associated with visual height intolerance.
  • To compare the eye and head movement patterns of individuals with and without VHI when exposed to heights.
  • To analyze the impact of VHI on gait parameters and its potential link to fall risk.

Summary:

  • Individuals with VHI exhibit restricted visual exploration when viewing from heights, characterized by diminished head movements and reduced saccadic eye movements.
  • Their gaze is preferentially directed towards the horizon, limiting peripheral visual input.
  • Gait analysis reveals a cautious, slowed pace with smaller steps in susceptible individuals, suggesting impaired obstacle detection during locomotion.

Impact:

  • Findings highlight a direct link between VHI, altered visual-motor strategies, and increased fall risk.
  • This research can inform the development of targeted interventions and safety guidelines for individuals with VHI.
  • Understanding these mechanisms can improve environmental design and support strategies in height-exposed settings.