Related Experiment Video
Updated: Jul 16, 2025
12:23
Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
Published on: April 14, 2014
14.1K
Cross-modal exposure restores multisensory enhancement after hemianopia
Naomi L Bean1, Barry E Stein1, Benjamin A Rowland1
1Department of Neurobiology and Anatomy, Wake Forest School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157, United States.
Cerebral Cortex (New York, N.Y. : 1991)
|September 19, 2023
Summary
Visual cortex damage causes hemianopia. A visual-auditory stimulation therapy improved vision and multisensory enhancement, suggesting complex recovery mechanisms beyond initial integration capabilities.
Area of Science:
- Neuroscience
- Vision Science
- Rehabilitation Medicine
Background:
- Hemianopia results from unilateral visual cortex damage, causing blindness in half the visual field.
- Noninvasive visual-auditory stimulation is a potential therapy for hemianopia in animal models.
- This therapy is thought to enhance visual sensitivity via multisensory integration in the superior colliculus.
Purpose of the Study:
- To investigate the relationship between hemianopia rehabilitation and multisensory integration.
- To determine if multisensory enhancement is a prerequisite for visual recovery.
Main Methods:
- Induction of hemianopia in an animal model.
- Evaluation of visual function and multisensory enhancement before and after cross-modal (visual-auditory) stimulation therapy.
- Analysis of recovery rates and spatial patterns of vision and multisensory enhancement.
Main Results:
- Hemianopia induction eliminated multisensory enhancement in the affected visual field.
- Cross-modal rehabilitation rapidly restored both vision and multisensory enhancement.
- Recovery rates were similar, but spatial patterns differed between vision and multisensory enhancement.
Conclusions:
- Multisensory integration and enhancement are not required for visual recovery in hemianopia.
- The mechanisms underlying visual recovery in hemianopia are more complex than previously assumed.
- Cross-modal therapies show promise for visual field defect rehabilitation.
More Related Videos
06:19Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
Published on: September 27, 2024
257
07:12Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
Published on: April 11, 2025
458
Related Concept Videos
01:12Visual Agnosia
234
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...
234
01:24Color Vision
611
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
611
01:27Synesthesia
155
Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
155
01:24Prosopagnosia
204
Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
204
01:24Vision
53.5K
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.
53.5K
01:22Photoreceptors and Visual Pathways
6.1K
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,...
6.1K