BINAURAL HEARING BEFORE AND AFTER MIDDLE EAR SURGERY

该项目的长期目标是对影响的理解 关于双耳听力的传导性听力损失，理解 中耳手术对双耳听力的影响 预测中耳手术能否恢复双耳听力 某一特定传导性受损患者的听力。它经常被认为是 就算中耳手术将改善双耳听力：目前 Project将直接测试这一假设。《公约》的具体目标 目前的研究是评估椎骨切除术的效果和 鼓室成形术在双耳听力检查中的应用 听力损失，2)听力损失的严重程度，3)病因 听力损失，4)听力的耳蜗组分的影响 损耗(以频率选择性和骨传导来衡量 阈值)，以及5)潜在表现的特定线索类型 (耳间时间与耳间幅度差)。所有的刺激都会是 通过耳机呈现，以精确控制球杆的类型 可用。双耳测试将包括根据提示进行的偏侧化 耳间时间差和噪声检测(掩蔽电平 差异)通过耳间时间差或耳间时间差的提示 幅度差。频率选择性的单声道测试(凹槽 噪声方法)将被用作耳蜗功能的测量。测试将会 在经过声音处理的房间里表演，三个间隔，三个 在所有任务中将使用替代的、强制选择的自适应程序。 受试者将包括听力正常的对照组(n=12)，患者 耳硬化症伴对称听力(n=12) 耳硬化症伴不对称听力(n=12)，中耳炎患者 对称听力(n=12)，患有中耳炎的患者 听力不对称12例。测试将在之前和第四天进行 在中耳手术后几个月。数据将使用以下分析进行分析 差异和相关程序。

The long-term objectives of this project are an understanding of the impact of conductive hearing losses on binaural hearing, an understanding of the effects of middle ear surgery on binaural hearing, and a means of predicting whether middle ear surgery can be used to restore binaural hearing in a given conductively impaired patient. It is often taken for granted that middle ear surgery will improve binaural hearing: the present project will test this assumption directly. The specific aims of the present investigation are to assess the effects of stapedectomy and tympanoplasty on binaural hearing, examining the factors of 1) the symmetry of the hearing loss, 2) the severity of the hearing loss, 3) the etiology of the hearing loss, 4) the effect of a cochlear component of the hearing loss (as measured by frequency selectivity and by bone conduction threshold), and 5) the specific kind of cue underlying performance (interaural time vs interaural amplitude disparity). All stimuli will be presented over earphones in order to control precisely the type of cue available. The binaural tests will include lateralization by the cue of interaural time difference, and detection in noise (Masking Level Difference) by the cues of either interaural time difference or interaural amplitude difference. A monaural test of frequency selectivity (notched noise method) will be used as a measure of cochlear function. Testing will be performed in a sound-treated room, and a three interval, three alternative, forced-choice adaptive procedure will be used in all tasks. Subjects will include a normal-hearing control group (n=12), patients having otosclerosis with symmetrical hearing (n=12), patients having otosclerosis with asymmetrical hearing (n=12), patients otitis media with symmetrical hearing (n=12), and patients having otitis media with asymmetrical hearing (n=12). Testing will be performed before and four months after middle ear surgery. Data will be analyzed using analysis of variance and correlation procedures.