<unk>  is a musical disorder that appears mainly as a defect in processing pitch but also encompasses musical memory and recognition. Two main classifications of<unk>  exist: acquired<unk> , which occurs as a result of brain damage, and congenital<unk> , which results from a music-processing anomaly present since birth. Studies have shown that congenital<unk>  is a deficit in fine-grained pitch discrimination and that 4% of the population suffers from this disorder. Acquired<unk>  may take several forms. Patients with brain damage may experience the loss of ability to produce musical sounds while sparing speech, much like aphasics lose speech selectively but can sometimes still sing. Other forms of<unk>  may affect specific sub-processes of music processing. Current research has demonstrated dissociations between rhythm melody and emotional processing of music.<unk>  may include impairment of any combination of these skill sets.
Amusia
Anotia
Mania
Somnophilia
Amaurosis fugax
Hypomimia
Dyssomnia
Distichia