Table 2.

Across-electrode correlations between the average threshold across polarities and the polarity effect with the logarithms of gap detection thresholds (GDTs), and of rate discrimination measures at low (RDR100) and high (RDR400) rates. The correlations were obtained by subtracting each subject’s mean score from every point, thereby removing between-subject effects. This is equivalent to performing an analysis of covariance with one measure as the dependent variable, the other as a covariate, and subject as a random factor (Bland and Altman 1995). In all cases, there were 24 degrees of freedom. The 1% and 5% significance levels for df = 24 are, respectively, 0.50 and 0.39

	GDT	RDR100	RDR400
Average	0.24	0.09	− 0.35
Polarity	− 0.08	0.06	− 0.29