Astereognosis is the inability to identify objects by touch even though the physical sensation of touch is intact. Individuals are unable to identify an object without being able to see it. It is caused by damage to parietal lobe. Remember how each brain hemisphere is responsible for movement on the opposite side of the body? This is true with astereognosis as well-damage to the left parietal lobe causes the inability to discern objects with the right hand. There is nothing wrong with the actual physical manifestation of touch - the brain is just unable to process and recognize it.

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