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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: Jun 26, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Visual objects can potentiate a grasping neural simulation which interferes with manual response execution.

Gerard Olivier¹, Jean Luc Velay

¹Cognitive and Social Psychology Laboratory, University of Nice Sophia-Antipolis, France. olivierg@unice.fr

Acta Psychologica

|January 7, 2009

Summary

Visuomotor priming effects on reach-to-grasp actions are only apparent when motor incompatibility occurs during response execution. The visual object must remain visible for this priming effect to disrupt performance.

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Area of Science:

Cognitive Neuroscience
Motor Control
Visual Perception

Background:

Visuomotor priming studies lack clarity on its specific impact during action execution.
Understanding how visual object information influences motor responses is crucial.

Purpose of the Study:

To investigate whether reach-to-grasp potentiation of a non-target object specifically affects response execution.
To determine the conditions under which visuomotor priming influences motor control.

Main Methods:

Participants performed reach-and-grasp tasks using power or precision grips based on visual stimuli (containers or shapes).
The non-target object image was removed during the response execution phase.
Motor compatibility and incompatibility conditions were manipulated.

Main Results:

Motor incompatibility led to slower response execution.
No motor compatibility advantage was observed.
Visuomotor priming effects were contingent on the object remaining visible during response execution.

Conclusions:

Motor incompatibility during response execution disrupts performance, likely due to neural competition.
Visual object information influences motor control only when present during action execution.
The findings clarify the temporal dynamics of visuomotor priming in reach-to-grasp actions.