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

2.0K
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...
2.0K
Parallel Processing01:20

Parallel Processing

950
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
950
Vision01:24

Vision

48.6K
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.
48.6K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

8.6K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
8.6K
Visual System01:26

Visual System

2.3K
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
2.3K
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

2.7K
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.
2.7K

You might also read

Related Articles

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

Sort by
Same author

Blindsight and residual vision: How reliable is the redundant target effect as a diagnostic tool?

Cortex; a journal devoted to the study of the nervous system and behavior·2026
Same author

Paper to Pixels: Enhancing Unilateral Neglect Assessment Using the New Computer Vision-Based Tool CANDO.

Brain sciences·2026
Same author

Emotional aftereffects in context-guided visual search: evidence from electrodermal activity and respiration.

Cognition & emotion·2026
Same author

Ponatinib for CML patients in routine clinical practice: the PONDEROSA study.

Annals of hematology·2026
Same author

Treatment expectations and goals among patients with chronic myeloid leukemia in Germany: a patient-centered perspective.

Leukemia·2025
Same author

Macrophage Activation-Like Syndrome in critically ill patients with sepsis: high risk patients with high mortality.

Anaesthesia, critical care & pain medicine·2025

Related Experiment Video

Updated: May 2, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

24.7K

Pointing in visual periphery: is DF's dorsal stream intact?

Constanze Hesse1, Keira Ball2, Thomas Schenk3

  • 1School of Psychology, University of Aberdeen, Aberdeen, United Kingdom.

Plos One
|March 15, 2014
PubMed
Summary

Patient DF, known for visual form agnosia, shows unexpected visuomotor impairments. Findings suggest combined ventral and dorsal stream damage, challenging existing theories of visual processing for action.

More Related Videos

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

7.9K
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

Related Experiment Videos

Last Updated: May 2, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

24.7K
Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

7.9K
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

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Patient DF's visual form agnosia supports the dual-stream hypothesis of vision (ventral for perception, dorsal for action).
  • DF's preserved visually-guided actions contrasted with optic ataxia patients' dorsal stream deficits.
  • DF's dorsal stream grey matter thinning and peripheral visual field deficits raise questions about optic ataxia.

Purpose of the Study:

  • To investigate patient DF's visuomotor performance in detail.
  • To assess the functional relevance of DF's dorsal stream atrophy.
  • To re-evaluate the dual-stream hypothesis in light of DF's complex visual deficits.

Main Methods:

  • Tested DF's pointing accuracy with both hands towards targets in different visual fields and eccentricities.
  • Compared DF's performance across various visuomotor tasks.
  • Analyzed grey matter density in DF's dorsal stream regions.

Main Results:

  • DF exhibited significant and consistent visuomotor impairments across all tested conditions.
  • These deficits were observed regardless of hand used or visual field.
  • DF's dorsal stream atrophy was found to be functionally significant.

Conclusions:

  • Patient DF displays impairments in both ventral and dorsal visual streams.
  • DF's seemingly normal visuomotor behavior requires a revised explanation.
  • The findings challenge the strict separation of visual processing streams for perception and action.