TABLE I.

Thresholds (T/M's corresponding to 0.5 proportion correct performance) and slopes, both from the logistic function fits to the individual and group-mean proportion correct values (the psychometric functions) of experiment 1A. The columns indicate the experimental conditions.

Listeners	Noise maskers				Speech maskers
	Voice		Location		Voice		Location
	SYN	RAN	SYN	RAN	SYN	RAN	SYN	RAN
Thresholds
1	−11.1	−9.6	−11.9	−10.6	−2.9	3.3	−7.9	3.3
2	−14.4	−12.3	−13.7	−11.9	−15.9	−8.4	−11.1	−7.6
3	−14.2	−13.0	−14.1	−12.4	−11.5	−0.0	−18.9	−8.0
4	−12.6	−12.6	−14.0	−13.6	−15.1	−11.3	−22.2	−21.3
5	−13.5	−10.7	−13.2	−11.8	−13.3	−8.5	−17.4	−13.9
MEAN	−13.1	−11.6	−13.4	−12.1	−11.7	−5.0	−15.5	−9.5
SE	0.6	0.6	0.4	0.5	2.3	2.8	2.6	4.0
AVG a	−13.3	−11.6	−13.4	−12.2	−11.7	−5.2	−15.7	−9.4
Slopes
1	0.060	0.088	0.091	0.050	0.031	0.033	0.026	0.034
2	0.081	0.071	0.123	0.081	0.023	0.030	0.033	0.027
3	0.084	0.090	0.095	0.078	0.022	0.022	0.025	0.022
4	0.082	0.075	0.112	0.085	0.025	0.029	0.025	0.019
5	0.070	0.112	0.114	0.061	0.022	0.019	0.023	0.022
MEAN	0.075	0.087	0.107	0.071	0.025	0.026	0.027	0.025
SE	0.004	0.007	0.006	0.007	0.002	0.003	0.002	0.003
AVG a	0.070	0.079	0.101	0.066	0.024	0.023	0.024	0.021

^aCalculated from the psychometric function fit to the group mean results.