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Related Concept Videos

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...
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"...
Blind Procedures02:07

Blind Procedures

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 child was...
Prosopagnosia01:24

Prosopagnosia

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...
Unrenewable Cells00:50

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Related Experiment Video

Updated: Jul 20, 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

[Bálint's syndrome: seeing blind].

K M Koorengevel1, F R J Verhey

  • 1Prins Claus Centrum te Sittard.

Tijdschrift Voor Psychiatrie
|September 8, 2006
PubMed
Summary

Bálint's syndrome, characterized by visual-spatial difficulties, is often an early sign of Alzheimer's disease. Misdiagnosis as psychological issues can delay crucial treatment and support for patients.

Area of Science:

  • Neuroscience
  • Neurology
  • Ophthalmology

Background:

  • Bálint's syndrome presents with simultanagnosia, ocular apraxia, and optical ataxia.
  • Early-stage Alzheimer's disease is a frequent underlying cause of Bálint's syndrome.
  • Lack of awareness can lead to misattribution of symptoms to psychological factors.

Observation:

  • A case study details a female patient experiencing Bálint's syndrome.
  • The patient's symptoms were corroborated by findings in three additional cases.
  • This highlights the neurological basis of the syndrome.

Findings:

  • Bálint's syndrome, encompassing simultanagnosia, ocular apraxia, and optical ataxia, is frequently linked to early Alzheimer's disease.
  • The study presents a case study and supporting data from three other patients with similar symptoms.

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Last Updated: Jul 20, 2026

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  • This underscores the importance of recognizing neurological underpinnings.

    • Implications:

    • Accurate diagnosis of Bálint's syndrome is crucial for timely and appropriate treatment.
    • Increased awareness can prevent misdiagnosis and ensure patients receive necessary neurological support.
    • Early identification, particularly linking it to Alzheimer's disease, can improve patient outcomes.