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Visual Agnosia

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...

Parallel Processing

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...

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Related Experiment Video

Updated: Oct 1, 2025

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

Published on: April 14, 2014

Visual Search in Naturalistic Scenes Reveals Impaired Cognitive Processing Speed in Multiple Sclerosis.

Johannes Gehrig¹, Heinrich Johannes Bergmann¹, Laura Fadai¹

¹Department of Neurology, University Hospital Frankfurt, Frankfurt, Germany.

Frontiers in Neurology

|March 3, 2022

Summary

This summary is machine-generated.

Multiple sclerosis patients with impaired information processing speed exhibit inefficient visual search patterns, impacting daily task performance. This suggests visual search deficits contribute to cognitive challenges in multiple sclerosis (MS).

Keywords:

cognition cognitive impairment (CI)everyday tasks eye tracking (ET)multiple sclerosis visual search (VS)

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Eye-Tracking Control to Assess Cognitive Functions in Patients with Amyotrophic Lateral Sclerosis

Eye-Tracking Control to Assess Cognitive Functions in Patients with Amyotrophic Lateral Sclerosis

Published on: October 13, 2016

Area of Science:

Neuroscience
Ophthalmology
Rehabilitation Medicine

Background:

Cognitive impairment is common in multiple sclerosis (MS).
The link between cognitive dysfunction and daily task difficulties in MS remains unclear.
Information processing speed, measured by the Symbol Digit Modalities Test (SDMT), is often affected in MS.

Purpose of the Study:

To investigate if MS patients with impaired vs. unimpaired information processing speed differ in visual search behavior.
To explore the role of visual search in translating cognitive deficits into everyday functional difficulties in MS.

Main Methods:

Forty-three relapsing-remitting MS patients participated in an eye-tracking experiment.
A visual search task with naturalistic images was employed.
Patients were categorized based on SDMT performance (impaired vs. unimpaired).

Main Results:

Impaired SDMT patients showed longer times to find and fixate targets, and less fixation time on targets.
Slower reaction times and reduced accuracy were observed in impaired patients, independent of motor function.
Unimpaired patients demonstrated higher accuracy, especially for targets in unexpected locations.

Conclusions:

Inefficient visual search behavior may mediate the impact of cognitive deficits on daily functioning in MS.
Cognitively impaired MS patients exhibit less efficient visual search, particularly when requiring top-down processing.
These findings highlight visual search as a potential therapeutic target in MS rehabilitation.