The influence of probe level on the tuning of stimulus frequency otoacoustic emissions and behavioral test in human

Table 1 The trends for changes in all parameters of SFOAE STCs and PTCs

Items			L _P (ranging from low to moderate)			F _p (ranging from 1 to 2 kH/from 2 to 4 kHz)
Items			F _p = 1 kHz	F _p = 2 kHz	F _p = 4 kHz	Low	Moderate
Tuning	Q ₁₀	SFOAE STCs	−	−	−	−/+	+/+
		PTCs	≈	+	+	−/+	+/+
		Ratio	+	+	+	+/≈	≈/≈
Slopes	Tail	SFOAE STCs	−	−	+	−/−	−/+
		PTCs	−	−	−	≈/−	−/+
		Difference	−	−	−	−/−	+/≈
	LF	SFOAE STCs	−	−	−	−/+	+/+
		PTCs	≈	+	+	−/+	+/+
		Difference	+	+	+	+/+	+/+
	HF	SFOAE STCs	−	+	−	−/+	+/+
		PTCs	+	+	+	−/+	+/+
		Difference	+	+	−	−/+	+/−
Shift at the tip	Frequency	SFOAE STCs	+	−	+	+/≈	−/+
		PTCs	+	−	≈	+/−	−/+
		Difference	+	+	+	+/≈	−/+
	Level	SFOAE STCs	+	+	+	+/−	−/−
		PTCs	+	+	+	≈/+	+/≈
		Difference	+	+	+	−/+	+/+

“+” represents increasing, “−” represents decreasing, “≈” represents little variation (variation ≤5 %). The variation range for f _p is divided into two sections which is ranging from 1 to 2 kHz and from 2 to 4 kHz, respectively

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