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

Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

1.2K
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.
1.2K

You might also read

Related Articles

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

Sort by
Same author

Attentional modulation of size perception in peripheral vision.

Journal of vision·2026
Same author

Dorsal Posterior Parietal Cortex Lesions Disrupt Spatial- but Not Motor-Based Inhibition.

The European journal of neuroscience·2026
Same author

The effect of spatial attention on saccadic adaptation.

Journal of vision·2025
Same author

A Cerebral Origin for Retinal Degeneration in the Visual Form of Alzheimer's Disease?

The European journal of neuroscience·2025
Same author

Repetitive somatosensory stimulation shrinks the body image.

Proceedings. Biological sciences·2025
Same author

Influence of aging on visual attention and peripheral perception.

Journal of vision·2025

Related Experiment Video

Updated: Oct 21, 2025

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients
07:43

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients

Published on: June 17, 2019

8.0K

Attentional limits in visual search with and without dorsal parietal dysfunction: space-based window or object-based

Audrey Vialatte1, Romeo Salemme1, Aarlenne Zein Khan2

  • 1Lyon Neuroscience Research Center (CRNL), Trajectoires Team, INSERM U1028, CNRS UMR, 5292, Université Claude Bernard, Lyon, France.

Neuropsychologia
|September 2, 2021
PubMed
Summary

Simultanagnosia and developmental dyslexia impair visual processing due to superior parietal lobule (SPL) dysfunction. This study differentiates their attentional deficits, showing SPL specifically impacts processing multiple separable objects, crucial for early reading.

Keywords:
Developmental dyslexiaPosterior parietal cortexSimultanagnosiaSimultaneous processingVisual perceptionVisual search

More Related Videos

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
13:00

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

10.0K
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

608

Related Experiment Videos

Last Updated: Oct 21, 2025

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients
07:43

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients

Published on: June 17, 2019

8.0K
Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
13:00

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

10.0K
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

608

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Simultanagnosia and developmental dyslexia involve impaired attentional resource and distribution, linked to superior parietal lobule (SPL) dysfunction.
  • While both conditions affect simultaneous visual processing, simultanagnosia is characterized by a reduced space-based attentional window, whereas dyslexia shows a reduced object-based span.
  • Understanding these distinct attentional limitations is crucial for diagnosing and treating visual processing disorders.

Purpose of the Study:

  • To investigate whether attentional limitations in healthy individuals and a patient with bilateral SPL damage are space-based or object-based.
  • To differentiate the attentional deficits in simultanagnosia and developmental dyslexia using serial search tasks with varying visual complexities.
  • To elucidate the specific role of the SPL in processing multiple objects with separable versus non-separable features.

Main Methods:

  • Employed a moving window paradigm to assess attentional limitations (working space vs. working span) in healthy participants and a patient with bilateral SPL damage.
  • Utilized serial search tasks with symbols (separable features) and objects (non-separable features), varying distractor similarity (identical vs. dissimilar).
  • Analyzed reaction times, saccade amplitude, and search performance in relation to set size and visual complexity.

Main Results:

  • Healthy individuals exhibited a space-based attentional window in tasks with non-separable objects and dissimilar distractors, independent of set size.
  • In tasks with separable features and dissimilar distractors, healthy participants demonstrated an object-based span, with saccade amplitude decreasing as set size increased.
  • The patient with bilateral SPL damage showed normal space-based search but a significant deficit in simultaneous object perception for separable features, especially when dissimilar, confirming SPL's role.

Conclusions:

  • The superior parietal lobule (SPL) plays a critical role in the visual processing of multiple objects, particularly those with separable features like letters.
  • Dysfunction of the SPL leads to a specific deficit in processing multiple, dissimilar objects, explaining reading difficulties in early literacy.
  • This research clarifies distinct attentional mechanisms underlying simultanagnosia and developmental dyslexia, highlighting the SPL's crucial contribution to visual perception and reading acquisition.