One of the mysteries of the English language finally explained.
The mental perception of depth or three-dimensionality by the senses, usually in reference to the ability to perceive the form of solid objects by touch.
- ‘Note that graphesthesia, stereognosis, and extinction cannot reliably be tested for unless primary sensation is intact bilaterally.’
- ‘Significant defects in graphesthesia and stereognosis occur with contralateral hemispheric disease, particularly in the parietal lobe (since this is the somatosensory association area that interprets sensation).’
- ‘This may indicate the possibility that oral stereognosis could enhance both the primary sensorimotor area and also other cerebral cortex regions associated with higher functions.’
- ‘Subtle signs of frontal lobe dysfunction may be demonstrated by testing stereognosis (such as the ability to identify an object placed in the patient's palm).’
Early 20th century: from Greek stereos ‘solid’ + gnōsis ‘knowledge’.
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