Object recognition is termed gnosia. Agnosia is the failure to recognize a sensory stimulus despite normal primary sensation. Show the patient a series of well-known objects, such as coins, pens, eyeglasses, or pieces of clothing, and ask the patient to name them. If the patient has normal vision and fails to recognize the object, visual agnosia is present. Tactile agnosia is the inability to recognize an object by palpation in the absence of a sensory deficit. This occurs with a lesion in the nondominant parietal lobe. Autotopagnosia is the term used to describe a patient's inability to recognize his or her own body part, such as the hand or leg.
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