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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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...
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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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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...
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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.
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Blind Procedures02:07

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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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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,...
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Related Experiment Video

Updated: Mar 28, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Relearning to See in Cortical Blindness.

Michael D Melnick1, Duje Tadin2, Krystel R Huxlin2

  • 1Department of Brain & Cognitive Sciences, University of Rochester, Rochester, NY, USA mmelnick@mail.cvs.rochester.edu.

The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry
|December 15, 2015
PubMed
Summary

Cortically induced blindness, often from stroke, is rising. This review explores visual restitution therapy, comparing approaches and discussing recovered vision to advance rehabilitation strategies.

Keywords:
V1perceptual learningstrokevision lossvision rehabilitation

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Rehabilitation Medicine

Background:

  • Increasing incidence of blindness caused by stroke affecting the primary visual cortex.
  • Significant impact on quality of life for affected individuals.
  • Lagging development of rehabilitation strategies compared to motor stroke recovery.

Purpose of the Study:

  • Summarize recent advancements in visual restitution therapy.
  • Compare the effectiveness of different therapeutic approaches.
  • Provide insights into the characteristics and neural basis of recovered vision.

Main Methods:

  • Literature review of emerging visual restitution therapies.
  • Comparative analysis of different treatment modalities.
  • Discussion of neuroplasticity and functional recovery mechanisms.

Main Results:

  • Overview of current visual restitution techniques.
  • Evaluation of the relative efficacy of various therapeutic strategies.
  • Identification of limitations and potential neural substrates of vision recovery.

Conclusions:

  • Visual restitution therapy is an emerging field with potential for treating cortically induced blindness.
  • Further research is needed to optimize rehabilitation strategies and address limitations.
  • Insights gained can guide future development of effective solutions for patients.