Stimulus and Recording Parameters Used to Obtain Frequency-Specific Auditory Brainstem Response (ABR) Threshold Estimations in the Study Comparing ABR Thresholds With Behavioral Thresholds in Real-Ear Sound Pressure Level

Stimulus calibration	500 Hz: 22 dB ppe SPL
(ER-3A)	1000Hz: 25 dB ppe SPL
	2000 Hz: 20 dB ppe SPL
	4000 Hz: 26 dB ppe SPL
Filters	High pass: 30 Hz
	Low pass: 1500 Hz
	6 or 12 dB/octave
	Analog
Stimuli	2-1-2 cycle, linearly gated tones
Window length	25 msec
Polarity	Alternating
Rate	37–41 sweeps/sec
Artifact reject	Trials exceeding 25 muV or ± 2 SD of quietest EEG signal, whichever is smaller
Average	2000 sweeps per average
	At least 2 averages

ppe SPL = peak pressure equivalent sound pressure level.