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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: Aug 20, 2025

Stereoacuity Improvement using Random-Dot Video Games

Stereoacuity Improvement using Random-Dot Video Games

Published on: January 14, 2020

Decrease in signal-related activity by visual training and repetitive visual stimulation.

Andreas Marzoll¹, Kazuhisa Shibata², Taro Toyoizumi²

¹Department of Cognitive, Linguistic and Psychological Sciences, Brown University, Providence, RI 02912, USA.

|November 24, 2022

Summary

This summary is machine-generated.

Repetitive high-frequency visual stimulation (H-RVS) enhances visual perceptual learning (VPL) after one session but impairs it after extensive training. This suggests reversal dynamics in VPL processing.

Keywords:

Biological sciences Neuroscience Sensory neuroscience

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Last Updated: Aug 20, 2025

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Published on: January 14, 2020

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Published on: February 20, 2014

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Published on: April 11, 2025

Area of Science:

Neuroscience
Cognitive Science
Perception

Background:

Visual perceptual learning (VPL) principles are known, but post-training processing mechanisms remain unclear.
Understanding how the brain consolidates and modifies learned visual information is crucial.

Purpose of the Study:

To investigate the impact of repetitive high-frequency visual stimulation (H-RVS) on VPL.
To explore the underlying mechanisms of post-training visual processing.

Main Methods:

An orientation detection task was used to assess VPL.
H-RVS was applied after single or multiple training sessions.
Performance was compared between H-RVS, sham, and low-frequency stimulation (L-RVS) conditions.

Main Results:

H-RVS enhanced orientation detection performance after one training session.
H-RVS led to performance impairment after extensive VPL (seven sessions).
Neither sham nor L-RVS conditions caused significant impairment.

Conclusions:

Findings suggest "reversal dynamics" in VPL, where high network excitation can decrease signal activity.
These dynamics may reconcile diverse findings in post-training visual processing.
This highlights a potential mechanism for regulating learned visual information processing.