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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 18, 2026

Investigating the Effect of Visual Imagery and Learning Shape-Audio Regularities on Bouba and Kiki

Investigating the Effect of Visual Imagery and Learning Shape-Audio Regularities on Bouba and Kiki

Published on: September 13, 2019

Object familiarity modulates the relationship between visual object imagery and haptic shape perception.

Simon Lacey¹, Peter Flueckiger, Randall Stilla

¹Department of Neurology, Emory University, Atlanta, GA 30322, USA.

|November 10, 2009

Summary

This summary is machine-generated.

Visual object imagery is more connected to haptic shape perception for familiar objects. This brain imaging study reveals shared neural networks for familiar object visual imagery and touch.

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Last Updated: Jun 18, 2026

Investigating the Effect of Visual Imagery and Learning Shape-Audio Regularities on Bouba and Kiki

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Published on: September 13, 2019

Creating Objects and Object Categories for Studying Perception and Perceptual Learning

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Published on: May 23, 2019

Area of Science:

Neuroscience
Cognitive Psychology
Sensory Perception

Background:

Visual cortical engagement in haptic shape perception is known.
The link between visual imagery and haptic perception is debated.

Purpose of the Study:

To investigate the relationship between visual object imagery and haptic shape perception.
To determine if object familiarity influences neural overlap between these tasks.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used.
Participants performed separate visual object imagery and haptic shape perception tasks.
Two experiments utilized unfamiliar and familiar objects.

Main Results:

Visual object imagery activations overlapped more with haptic perception of familiar objects.
Neural networks for visual imagery and haptic perception of familiar objects showed greater similarity.
Object familiarity significantly modulated the neural overlap.

Conclusions:

Visual object imagery is more closely linked to haptic shape perception for familiar objects.
Neural networks for visual imagery and haptic perception converge when processing familiar objects.