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Updated: Jun 29, 2026

Ultrasound Images of the Tongue: A Tutorial for Assessment and Remediation of Speech Sound Errors
Published on: January 3, 2017
Two new illusions of the tongue
1The Children's Hospital of Philadelphia, Department of Radiology/Neuroradiology, 3400 Civic Center Blvd, Philadelphia, PA 19104, USA. egeth@email.chop.edu
Abstract:
New illusions resulting from failures in proprioception are described. The Forked Tongue illusion results from weaving the tongue among the prongs of a fork, or from using the prongs of a fork to distort skin on other parts of the body-in these cases, the prongs feel misaligned even though the fork has not bent. The Tongue Twister illusion results from turning the tongue upside down and probing it with a finger or foreign object-the object can be felt to be in the wrong spatial location, opposite to where it actually is on the tongue.
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