Fig 5. There was a significant but small and inconsistent reduction in the magnitude of the masking peak when the masker is moved to the opposite ear than the probe.

The top panel shows the magnitude of the contralateral peak divided by the magnitude of the ipsilateral peak. Values below one (dashed line) indicate that the peak of masking is higher when the masker and probe are in the same ear. The bottom panel shows the magnitude of the ipsilateral peak minus the magnitude of the contralateral peak. Positive scores indicate that the magnitude of peak masking is lower when the masker and probe are in opposite ears than when they are in the same ear.