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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 28, 2025

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Dynamic visual acuity during asymmetric walking.

C Dane Napoli¹, Joseph Hamill², Wouter Hoogkamer²

¹Motor Control Laboratory, 24A Totman Building, 30 Eastman Lane, University of Massachusetts Amherst, Amherst, MA 01003, USA; Biomechanics Laboratory, 23A Totman Building, 30 Eastman Lane, University of Massachusetts Amherst, Amherst, MA 01003, USA.

Human Movement Science

|September 15, 2022

Summary

This summary is machine-generated.

Locomotor asymmetry from split-belt treadmills can reduce head stability and dynamic visual acuity. The body adapts, lessening these effects over time, showing the adaptability of movement and vision systems.

Keywords:

Dynamic visual acuity Head stability Locomotor adaptation Locomotor asymmetry Shock attenuation

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Area of Science:

Biomechanics
Neuroscience
Human Locomotion

Background:

Head stability is crucial for visual perception during dynamic activities like walking.
Understanding how locomotor asymmetry impacts head stability and dynamic visual acuity is limited.
Ground contact shock attenuation contributes to head-in-space equilibrium.

Purpose of the Study:

To investigate the effects of locomotor asymmetry on head stability and dynamic visual acuity.
To examine shock attenuation and head movement during split-belt treadmill walking.
To assess the adaptive responses of the locomotor and visuomotor systems.

Main Methods:

Fifteen participants walked on a split-belt treadmill under baseline, adaptation, and washout conditions.
Locomotor asymmetry was induced using belt speed ratios (1:1, 1:3, 1:1).
Measurements included step length asymmetry, shock attenuation, head signal power, and dynamic visual acuity (Landolt-C optotype).

Main Results:

Locomotor asymmetry significantly increased step length asymmetry and high-frequency head movement during adaptation.
Shock attenuation decreased, and dynamic visual acuity showed a moderate decrease during early adaptation.
These decrements were reduced in the later strides of adaptation, indicating adaptation.

Conclusions:

Split-belt treadmill-induced locomotor asymmetry can temporarily impair shock attenuation, head stability, and dynamic visual acuity.
The findings highlight the adaptive capacity of the human locomotor and visuomotor systems.
Further research can explore interventions to improve stability during asymmetrical gait.