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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 end"...

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Related Experiment Video

Updated: May 25, 2026

Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking

Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking

Published on: August 29, 2018

A gaze independent spelling based on rapid serial visual presentation.

Laura Acqualagna¹, Benjamin Blankertz

¹Berlin Institute of Technology, Machine Learning Laboratory, Berlin, Germany. lauraacqualagna@libero.it

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

This study shows that an event-related potential (ERP) speller using rapid serial visual presentation (RSVP) is effective for communication. High accuracy and potential for practical spelling speeds were achieved, benefiting those with communication impairments.

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Area of Science:

Neuroscience
Biomedical Engineering
Rehabilitation Technology

Background:

Brain-computer interfaces (BCIs) offer communication solutions for individuals with severe motor impairments.
Event-related potentials (ERPs) are measurable brain responses used in BCIs for assistive communication.

Purpose of the Study:

To evaluate the performance of an ERP speller utilizing the rapid serial visual presentation (RSVP) paradigm.
To investigate the effects of chromaticism and stimulus presentation speed on RSVP speller performance.

Main Methods:

An online study involving twelve participants using an ERP speller with RSVP.
Testing three variants of the RSVP speller, varying chromaticism and stimulus speed.
Offline analysis to determine potential spelling speed.

Main Results:

All participants successfully operated the RSVP speller.
High mean symbol selection accuracies were achieved across all tested conditions (93.6%–94.8%).
Offline analysis indicated a potential mean spelling speed of approximately 2 symbols per minute.

Conclusions:

The RSVP-based ERP speller demonstrates high accuracy and usability for individuals with communication disabilities.
The speller's gaze-independent nature makes it suitable for patients with oculomotor control issues.
This BCI technology shows promise for enhancing communication accessibility.