When you ask a patient to close her or his eyes and identify an object placed in the hand, you are evaluating:
a. stereognosis.
b. graphesthesia.
c. vibratory sensation.
d. extinction phenomenon.
A
Stereognosis is the ability to recognize an object through touch and manipulation. Tactile agnosia, an inability to recognize objects by touch, suggests a parietal lobe lesion. Graphesthesia tests the patient's ability to identify the figure being drawn on the palm. The vibratory sense uses a tuning fork placed on a bony prominence, and the extinction phenomenon tests sensation by simulta-neously touching bilateral sides of the body with a sterile needle.
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