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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: Apr 23, 2026

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

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Stimulus-dependent modulation of visual neglect in a touch-screen cancellation task.

Ingo Keller¹, Katharina Volkening², Ruta Garbacenkaite³

¹Department of Neuropsychology, Graduate School of Systemic Neurosciences, Schoen Klinik Bad Aibling.

Neuropsychology

|October 7, 2014

Summary

Visual feedback and distracters worsen left-sided neglect symptoms like omissions and perseverations in cancellation tasks. Vanishing targets significantly improved performance, suggesting therapeutic potential for visual neglect.

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Last Updated: Apr 23, 2026

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Published on: October 19, 2014

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Published on: March 18, 2019

Area of Science:

Neuroscience
Cognitive Psychology
Rehabilitation Science

Background:

Left-sided neglect is characterized by omissions and repetitive behaviors in cancellation tasks.
Understanding factors influencing these behaviors is crucial for effective rehabilitation.

Purpose of the Study:

To investigate the impact of visual feedback and distracters on omissions and perseverations in left-sided neglect using a touch-screen cancellation task.
To compare the performance of patients with left-sided neglect and healthy controls under different task conditions.

Main Methods:

Eighteen patients with left-sided neglect and 18 controls completed four iPad cancellation tasks: no feedback, visual feedback, visual feedback with distracters, and vanishing targets.
Omissions and perseverations were quantified for each condition.

Main Results:

Patients with neglect showed significantly more omissions and perseverations than controls, except in the vanishing targets condition.
Visual feedback, especially with distracters, increased omissions. Vanishing targets nearly eliminated omissions.
Perseverations were highest without feedback, moderately increased with distracters, and nearly abolished with visual feedback (without distracters) and vanishing targets.

Conclusions:

Visual feedback and distracters exacerbate hemispatial neglect, supporting the role of impaired disengagement from the ipsilesional side.
The improvement in cancellation behavior with vanishing targets suggests potential therapeutic applications for visual neglect.