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

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"...
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...
Parallel Processing01:20

Parallel Processing

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...
Vision01:24

Vision

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.
Visual System01:26

Visual System

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...

You might also read

Related Articles

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

Sort by
Same author

Plasma BDNF levels in children with ADHD before and after methylphenidate treatment.

Scandinavian journal of child and adolescent psychiatry and psychology·2026
Same author

Do congruency effects in Navon's and Stroop's paradigms reflect the same (control) mechanisms? A conceptual analysis and an empirical test.

Psychological review·2026
Same author

Visual perception in adults with CP - assessment and individual differences: An exploratory study.

The Clinical neuropsychologist·2025
Same author

Definition: Simultanagnosia.

Cortex; a journal devoted to the study of the nervous system and behavior·2025
Same author

The Validation of the Danish Version of the Santa Barbara Sense of Direction Scale (SBSoDDK) and a Comparison of Performance on the SBSoD Across Samples with Different Nationalities.

Behavioral sciences (Basel, Switzerland)·2025
Same author

The lateralization of reading.

Handbook of clinical neurology·2025
Same journal

Temporal acceleration drives the probability cueing effect in visual search: Evidence for early attentional deployment (N1pc) at high-probability locations.

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

The cognitive construction of moral scenes: Associations of visuospatial ability and impulsivity with perspective and vividness in mental simulation.

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

Theta band activity during event-file retrieval is influenced by stimulus salience in the preceding action episode.

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

Language recovery in Hungarian speakers with aphasia: Roles of phonology and intraindividual variability.

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

Neural and behavioral dissociations of self-focused and other-focused incentives in trust.

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

A multiverse analysis of the logical memory test and plasma biomarkers of Alzheimer's disease.

Cortex; a journal devoted to the study of the nervous system and behavior·2026
See all related articles

Related Experiment Video

Updated: Jun 23, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Visual processing in pure alexia: a case study.

Randi Starrfelt1, Thomas Habekost, Christian Gerlach

  • 1Department of Psychology, Center for Visual Cognition, University of Copenhagen, Denmark. randi.starrfelt@psy.ku.dk

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|May 19, 2009
PubMed
Summary
This summary is machine-generated.

Pure alexia may involve general visual deficits, not just reading impairment. This study found a pure alexic patient had broader visual processing issues beyond letters and words.

More Related Videos

A Semantic Priming Event-related Potential (ERP) Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder
08:17

A Semantic Priming Event-related Potential (ERP) Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder

Published on: April 12, 2018

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
07:11

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation

Published on: December 8, 2023

Related Experiment Videos

Last Updated: Jun 23, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

A Semantic Priming Event-related Potential (ERP) Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder
08:17

A Semantic Priming Event-related Potential (ERP) Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder

Published on: April 12, 2018

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
07:11

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation

Published on: December 8, 2023

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Pure alexia is debated as a selective reading disorder versus a general visual impairment.
  • Investigating the selectivity of visual deficits in pure alexia is crucial for understanding its underlying mechanisms.

Observation:

  • A pure alexic patient (NN) demonstrated normal naming and categorization of line drawings.
  • Psychophysical tests revealed impaired recognition of single letters and digits at fixation.
  • NN exhibited a reduced visual apprehension span for letters and digits, and abnormal performance in an object decision task.

Findings:

  • Despite intact line drawing recognition, NN showed evidence of a general visual deficit not limited to letters or words.
  • The patient's reduced visual processing capacity was apparent in tasks involving letter reporting from words.
  • These findings suggest that pure alexia might encompass non-selective visual impairments in some individuals.

Implications:

  • The study challenges the notion of pure alexia as solely a selective reading disorder.
  • A general, low-level visual deficit, such as inefficient sensory representation build-up, may explain the observed pattern of abilities in NN.
  • Thorough testing may reveal similar non-selective visual impairments in other pure alexic patients.