Cortical Sensation, Including Extinction

Previous Page: Primary Sensation, Asymmetry, Sensory Level

Higher-order aspects of sensation, or cortical sensation, should be tested as well. To test graphesthesia, ask the patient to close their eyes and identify letters or numbers that are being traced onto their palm or the tip of their finger. To test stereognosis, ask the patient to close their eyes and identify various objects by touch, using one hand at a time. Test also for tactile extinction on double simultaneous stimulation. Note that graphesthesia, stereognosis, and extinction cannot reliably be tested for unless primary sensation is intact bilaterally.

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