The present study evaluated the influence of suppressor frequency (fs) and level (Ls) on stimulus-frequency otoacoustic emissions (SFOAEs) recorded using the amplitude-modulated (AM) suppressor technique described by Neely et al. [J. Acoust. Soc. Am. >118, 2124-2127 (2005a)]. Data were collected in normal-hearing subjects, with data collection occurring in two phases. In phase 1, SFOAEs were recorded with probe frequency (fp) = 1, 2, and 4 kHz and probe levels (Lp) ranging from 0 to 60 dB sound pressure level (SPL). At each fp, Ls ranged from Ls = Lp to Ls = Lp + 30 dB. Additionally, nine relationships between fs and fp were evaluated, ranging from fs/fp = 0.80 to fs/fp = 1.16. Results indicated that for low suppressor levels, suppressors higher in frequency than fp (fs > fp) resulted in higher AM-SFOAE levels than suppressors lower in frequency than fp (fs < fp). At higher suppressor levels, suppressors both higher and lower in frequency than fp produced similar AM-SFOAE levels, and, in many cases, low-frequency suppressors produced the largest response. Recommendations for stimulus parameters that maximize AM-SFOAE level were derived from these data. In phase 2, AM-SFOAEs were recorded using these parameters for fp = 0.7-8 kHz and Lp = 20-60 dB SPL. Robust AM-SFOAE responses were recorded in this group of subjects using the parameters developed in phase 1.
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机译：本研究评估了抑制器频率（fs）和电平（Ls）对使用Neely等人描述的调幅（AM）抑制器技术记录的刺激频率耳声发射（SFOAEs）的影响。 [J. co Soc。上午。 > 118 ，2124-2127（2005a）]。在听力正常的受试者中收集数据，数据收集分两个阶段进行。在第1阶段，以探头频率（fp）= 1、2和4 kHz，探头电平（Lp）在0至60 dB声压级（SPL）范围内记录SFOAE。在每个fp处，Ls的范围为Ls = Lp至Ls = Lp + 30 dB。另外，评估了fs和fp之间的九种关系，范围从fs / fp = 0.80到fs / fp = 1.16。结果表明，对于低抑制水平，抑制频率高于 f p （ f s f p ）导致AM-SFOAE的水平高于抑制器，其频率低于 f p （ f s em> f p ）。在较高的抑制器水平下，频率比 f p 高和低的抑制器产生相似的AM-SFOAE水平，并且在许多情况下，低频抑制器产生的响应最大。从这些数据中得出了使AM-SFOAE水平最大化的刺激参数的建议。在阶段2中，使用这些参数记录了AM-SFOAE，这些参数用于 f p = 0.7-8 kHz和 L p = 20-60 dB SPL。使用第一阶段开发的参数，在该组受试者中记录了强大的AM-SFOAE反应。
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