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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...

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Related Experiment Video

Updated: Jan 7, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

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

Katrine Sand¹, Kathleen Vancleef², Randi Starrfelt¹

¹Department of Psychology, University of Copenhagen, Copenhagen, Denmark.

The Clinical Neuropsychologist

|December 11, 2025

Summary

This summary is machine-generated.

Adults with cerebral palsy (CP) often experience wide-ranging visual perceptual impairments, affecting face recognition, reading, and visuospatial skills. Most individuals with CP showed deficits on multiple tests, indicating significant visual processing challenges.

Keywords:

Visual perception adults cerebral palsy dorsal stream processing neuropsychological assessment ventral stream processing

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Last Updated: Jan 7, 2026

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Published on: March 17, 2023

Area of Science:

Neuroscience
Ophthalmology
Psychology

Background:

Visual perception deficits are common in individuals with cerebral palsy (CP).
Limited research exists on the spectrum of visual perceptual impairments in adults with CP.
Individual-level performance data on these deficits are scarce.

Purpose of the Study:

To characterize the visual perceptual functions in a cohort of adults diagnosed with cerebral palsy.
To assess a broad range of visual perceptual abilities in adults with CP, accommodating varying motor impairment severities.

Main Methods:

Assessed 21 adults with CP and 40 neurotypical controls (aged 18-40 years) using standard neuropsychological visual perceptual tests.
Selected tests to ensure participation across all CP severity levels.
Analyzed data at both group and individual levels using single-case methodology, with pre-registered analyses.

Main Results:

Participants with CP demonstrated significantly poorer performance compared to controls in face recognition, reading, and visuospatial functions.
No significant differences were observed in object recognition between the groups.
Individually, 18 out of 21 participants with CP exhibited impairments in more than two visual perceptual tests.

Conclusions:

Adults with cerebral palsy exhibit a diverse array of visual perceptual impairments, detectable even with screening tests.
Impaired visual perceptual functions in this group suggest dysfunction in both dorsal and ventral visual streams.