Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

1.7K
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...
1.7K
Prosopagnosia01:24

Prosopagnosia

1.1K
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...
1.1K
Association Areas of the Cortex01:21

Association Areas of the Cortex

10.6K
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,...
10.6K
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

11.1K
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,...
11.1K
Dissociative Amnesia01:21

Dissociative Amnesia

997
Dissociative amnesia is a complex psychological condition that manifests as an inability to recall personal information, often tied to traumatic or stressful events. Unlike general amnesia, individuals with this condition retain the ability to perform routine activities and procedural tasks, such as operating a phone or navigating public transportation, yet experience profound gaps in autobiographical memory. These lapses may encompass significant life events, such as suicide attempts or...
997
Amnesia01:13

Amnesia

838
Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
838

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Optimising the management of spontaneous intracerebral haemorrhage: the ActúA project. Expert recommendations on the management of spontaneous intracerebral haemorrhage.

Neurologia·2026
Same author

Common calcaneal tendon repair in cats: outcomes and complications associated with different postoperative tarsocrural joint immobilisation methods.

The Journal of small animal practice·2025
Same author

Exploring the impact of NGS on diagnostics and treatment of sarcoma: insights from real-world data across multiple institutions in Europe.

ESMO open·2025
Same author

A proposed methodology for the definition of background and reference values for trace elements in fluvial sediments.

Ecotoxicology and environmental safety·2024
Same author

High photosynthetic thermal tolerance in the Mediterranean halophyte <i>Limoniastrum monopetalum</i>.

Photosynthetica·2024
Same author

Comparison of sediment bioavailable methods to assess the potential risk of metal(loid)s for river ecosystems.

Ecotoxicology and environmental safety·2024
Same journal

Vaccination status of patients undergoing HIV treatment in a hospital in Madrid.

Revista clinica espanola·2026
Same journal

Sulfonylureas and fracture risk in patients with type 2 diabetes mellitus: a systematic review and meta-analysis.

Revista clinica espanola·2026
Same journal

Risk factors for the development of in-hospital complications in pluripathological patients.

Revista clinica espanola·2026
Same journal

Features, treatment and 1-year prognosis of patients with heart failure and chronic kidney disease stages 4 or 5.

Revista clinica espanola·2026
Same journal

Notification of suspected adverse drug reactions by nurses to a hospital pharmacovigilance program. Retrospective descriptive study.

Revista clinica espanola·2026
Same journal

Venous thromboembolic disease associated with hormonal contraceptives. Venous Thromboembolism Group of the Spanish Society of Internal Medicine and the Catalan Society of Contraception.

Revista clinica espanola·2026
See all related articles

Related Experiment Video

Updated: Apr 4, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
07:04

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

4.7K

Visual agnosia.

R Álvarez1, J Masjuan2

  • 1Servicio de Neurología, Hospital Universitario Ramón y Cajal, Madrid, España.

Revista Clinica Espanola
|September 12, 2015
PubMed
Summary
This summary is machine-generated.

Visual agnosia impairs object recognition due to brain lesions. This review explores visual agnosia syndromes, classifying them by damaged visual processing streams: ventral for recognition and dorsal for spatial location.

Keywords:
AchromatopsiaAcromatopsiaAgnosiaProsopagnosiaSimultagnosiaSimultanagnosiaVisual

More Related Videos

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

1.0K
The Dig Task: A Simple Scent Discrimination Reveals Deficits Following Frontal Brain Damage
11:16

The Dig Task: A Simple Scent Discrimination Reveals Deficits Following Frontal Brain Damage

Published on: January 4, 2013

14.1K

Related Experiment Videos

Last Updated: Apr 4, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
07:04

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

4.7K
Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

1.0K
The Dig Task: A Simple Scent Discrimination Reveals Deficits Following Frontal Brain Damage
11:16

The Dig Task: A Simple Scent Discrimination Reveals Deficits Following Frontal Brain Damage

Published on: January 4, 2013

14.1K

Area of Science:

  • Neuroscience
  • Neurology
  • Ophthalmology

Background:

  • Visual agnosia is a specific deficit in object recognition.
  • It is not caused by primary visual acuity or general cognitive impairments.
  • Lesions in the visual association cortex, not the primary visual cortex, underlie this condition.

Purpose of the Study:

  • To provide a narrative review of visual agnosia syndromes.
  • To discuss recent advancements in understanding these syndromes.
  • To categorize visual agnosia based on affected visual processing pathways.

Main Methods:

  • Narrative review of existing literature.
  • Analysis of visual processing streams (ventral and dorsal).
  • Classification of agnosia syndromes based on lesion location.

Main Results:

  • Visual agnosia is linked to damage in the visual association cortex.
  • Two primary visual processing streams exist: ventral (object recognition) and dorsal (spatial location).
  • Visual agnosia can be broadly categorized into syndromes affecting these two streams.

Conclusions:

  • Understanding visual agnosia requires differentiating between ventral and dorsal stream impairments.
  • Recent developments offer new insights into specific visual agnosia subtypes.
  • This review synthesizes current knowledge on visual agnosia syndromes.