Loss of one’s ability to interpret sensory stimuli without explanation.
Example: There is no medical reason for the patient to have lost her sense of smell, but you can put a sample of anything under her nose – onion, pepper, ammonia – and she doesn’t react.
Grinnell, R. (2008). Agnosia. Psych Central. Retrieved on November 30, 2015, from http://psychcentral.com/encyclopedia/2008/agnosia/