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Related Experiment Video

Updated: Mar 1, 2026

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS

Published on: July 30, 2020

Pure Amorphagnosia without Tactile Object Agnosia.

Shinichirou Kubota¹, Mai Yamada¹, Hideyo Satoh²

¹Section of Rehabilitation, Nagasaki Kita Hospital, Nagasaki, Japan.

Case Reports in Neurology

|June 1, 2017

Summary

This study reports the first case of amorphagnosia without tactile agnosia following a right cerebral infarction. The patient could not recognize shapes but could identify object textures and real-world items.

Keywords:

Ahylognosia Amorphagnosia Cerebral infarction Tactile agnosia

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Last Updated: Mar 1, 2026

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Area of Science:

Neuroscience
Neurology
Cognitive Science

Background:

Tactile agnosia, the inability to recognize objects by touch, is a complex neurological deficit.
Previous cases of tactile agnosia often involved impairments in recognizing both shape (amorphagnosia) and substance qualities (ahylognosia).

Observation:

A 54-year-old female developed amorphagnosia affecting her left hand after a right cerebral infarction.
Her somatosensory functions, hylognosia (appreciation of substance qualities), and recognition of real objects remained intact.
Neuroimaging revealed ischemic lesions in the right precentral and postcentral gyri, medial frontal cortex, and parietal regions.

Findings:

This case is unique as it presents solely with amorphagnosia, without ahylognosia or tactile agnosia.
The findings challenge the notion that amorphagnosia is always accompanied by ahylognosia.
Preserved hylognosia may explain the patient's ability to recognize real objects despite shape recognition deficits.

Implications:

This case expands the understanding of the neural substrates underlying tactile object recognition.
It suggests that shape and substance perception pathways may be dissociable.
Further research is needed to elucidate the precise mechanisms and clinical implications of isolated amorphagnosia.