<unk>  refers to a number of disorders which are indicated by the inability to recognize musical tones or rhythms or to reproduce them.<unk>  can be congenital (present at birth) or be acquired sometime later in life (as from brain damage).  The term<unk> " is composed of a- +<unk>  which means the lack of music.
Recent research has suggested that the human brain has neural networks specifically for the processing of music, and suggests that<unk>  is caused primarily by a deficiency in fine-grained perception of pitch.
Amusia
Mania
Amaurosis fugax
Myokmia
Dyssomnia
Parasomnia
Parageusia
Coccydynia