Mean ITD thresholds for lateralizing musical tone pairs with different pitch-interval size.

The noise control condition used low-pass noise with cut-off frequency at 1200 Hz. In the varied condition, tone pairs were randomly selected from 0, 1, 5, 10 semitones. Size of pitch-interval had no effect on lateralizing musical tone pairs in control and amusic groups. Error bars represent ± 1 standard deviation.