Table 1.

t-Tests against zero of the noise-subtracted amplitudes for the base and contrast responses

	Base Response (8 Hz f1–f2)	Contrast Response (1.6 Hz f1–f4)
Experiment 1: frequency contrast
Condition 1: 0.02 semitone	0.094 ± 0.058 μV, P = 0.0006	−0.001 ± 0.007 μV, P = 1
Condition 2: 0.50 semitone	0.106 ± 0.054 μV, P < 0.0001	0.038 ± 0.044 μV, P = 0.036
Condition 3: 4 semitone	0.143 ± 0.106 μV, P = 0.0021	0.223 ± 0.132 μV, P = 0.0003
Experiment 2: interaural time contrast
Condition 1: 0 μs	0.103 ± 0.055 μV, P < 0.0001	0.001 ± 0.017 μV, P = 1
Condition 2: 600 μs	0.130 ± 0.074 μV, P < 0.0001	0.162 ± 0.075 μV, P < 0.0001

Values are means ± SD; n = 12 for each experiment. These values were obtained for each participant from a pool of fronto-central electrodes and averaged across harmonics within contrast (f1–f2) and base (f1–f4) responses.