Related Experiment Video
Updated: Jul 20, 2025
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
461
Early Visual Deprivation Impairs Functional Development of the Visual Ventral Stream
Yifan Xiang1, Jingwen Yang2,3, Leyan Gao2
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Vision Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China.
Investigative Ophthalmology & Visual Science
|August 1, 2023
Summary
Children with early visual deprivation (VD) show altered neural processing after cataract removal. Their visual cortex and ventral stream have lower activation, with frontal areas compensating, impacting visual recovery.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Visual Processing
Background:
- Early visual deprivation (VD) can impact neural network development.
- Understanding real-time visual processing alterations post-VD is crucial for effective interventions.
Purpose of the Study:
- To investigate dynamic changes in neural networks during real-time visual processing after early binocular VD removal.
- To compare visual processing in children with a history of VD to typically developing (TD) children.
Main Methods:
- Prospective cross-sectional study involving 20 children with early VD and 20 TD children.
- High-density electroencephalography (EEG) to record event-related potentials (ERPs).
- Analysis of ERP components (P1, N170, P2) across object, face, and character stimuli, using source localization and alpha power analysis.
Main Results:
- Children with VD exhibited significantly lower P1 amplitudes in the left occipito-temporal region compared to TD children.
- Source mapping revealed reduced activation in the visual cortex and ventral stream in the VD group.
- Frontal areas showed increased participation for functional compensation in the VD group, with significant alpha desynchronization during object recognition.
Conclusions:
- Early binocular VD removal leads to distinct alterations in visual network dynamics.
- Findings suggest a basis for poorer visual recovery and offer insights for developing visual rehabilitation strategies.
Related Concept Videos
01:12Visual Agnosia
237
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...
237
01:24Vision
53.6K
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.
53.6K
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
01:15Depth Perception and Spatial Vision
726
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.
726
01:26Visual System
617
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...
Once through the pupil, the light passes through the lens, a...
617