Anosognosia (/æˌnɒsɒɡˈnoʊziə/, /æˌnɒsɒɡˈnoʊʒə/; from Ancient Greek ἀ- a-, “without”, νόσος nosos, “disease” and γνῶσις gnōsis, “knowledge”) is a deficit of self-awareness, a condition in which a person who suffers a certain disability seems unaware of the existence of his or her disability.
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As with unilateral neglect, caloric reflex testing (squirting ice cold water into the left ear) is known to temporarily ameliorate unawareness of impairment. It is not entirely clear how this works, although it is thought that the unconscious shift of attention or focus caused by the intense stimulation of the vestibular system temporarily influences awareness.