Figure 5: Level differences required for a central percept of broadband noise when stimulating both ears simultaneously. A: Input-level differences. B: Output-level differences, also referred to as ILDs. For both panels, the black boxes represent NH subjects, dark gray boxes represent HI subjects with symmetric hearing thresholds, and light gray boxes represent HI subjects with asymmetric hearing thresholds. The colored symbols represent individual data. Three fixed levels corresponding to 15, 25, and 35 CU were presented to the audiometrically better ear. Positive values indicate that to obtain a central percept, a higher level was required at the worse ear.