Tonal language processing in congenital amusia.

Twenty amusic and 20 control speakers of French were presented with pairs of Mandarin lexical tones to discriminate as same or different. Results revealed that even if the amusic group performed significantly below the control group, the scores of the two groups largely overlapped, with only 15% of the amusic group performing outside the normal variations. Thus, the findings suggest a modest transfer of deficit between music and speech, which in turn calls for further work in order to identify the nature of the mediating factors.