Table 5.

d' value measured by SDT in the congenital amusia group and healthy control group.

	Congenital amusics	Healthy controls	p-value
Scale	0.852 ± 0.546	2.537 ± 0.384	0.000*
Contour	1.253 ± 0.758	2.769 ± 0.328	0.000*
Interval	0.877 ± 0.576	2.444 ± 0.654	0.000*
Rhythm	1.050 ± 0.430	2.578 ± 0.321	0.000*
Meter	0.660 ± 1.020	1.305 ± 1.113	0.125
Memory	1.267 ± 0.836	2.689 ± 0.367	0.000*
Global	0.999 ± 0.310	2.865 ± 0.575	0.000*

SDT, signal detection theory.

^p*< 0.05, which indicated that there was a statistical difference in the d value between the two groups.