Table 1. Study design.

Italics indicate the interaction of primary interest.

2x2x2 Factorial design		Intensity change
		Rising		Falling
Carrier frequency	Complex tone	High	Low	High	Low
		50–68 dB	68–86 dB	68–50 dB	86–68 dB
	White Noise	High	Low	High	Low
		50–68 dB	68–86 dB	68–50 dB	86–68 dB