Asymbolia

Asymbolia (from the Greek a- negative particle and symbolon-sign), a disorder of the ability to understand the meaning of conventional signs (symbols) and to use them properly. To disorders of understanding conventional signs belong sensory aphasia, alexia, amusia, disorders of understanding gestures, facial expressions, games, etc. To disorders of using conventional signs belong motor aphasia, agraphia, vocal and instrumental amusia, inability to write musical notes, inability to use gestures and facial expressions. From agnosia and apraxia, asymbolia differs in that it affects only the sphere of conventional signs. Some significantly broaden the concept of asymbolia, including agnosia and apraxia here as well (see Aphasia).