Cochlear Implant--Auditory Function & Speech Perception

描述(由申请人提供)：本项目的目标是对使用电声刺激(EAS)听力的患者的言语、声音和音乐感知能力进行研究，并将言语、声音和音乐感知与声学听力区域潜在的心理物理能力联系起来。这一目标将通过与6个目标相关的实验和分析实现。目的1是通过评估听阈和获得非线性耳蜗加工、频率选择性和时间分辨率的估计值，来表征植入前后残留听力患者的低频听力。目的2是评估单独的声刺激、单独的电刺激以及声和电联合刺激对语音、声音和音乐识别测试的影响。目的3确定低频听觉心理物理测量与语音、语音和音乐识别测量之间的关系。目的4比较EAS患者、单侧植入物和双侧植入物患者在语音、语音和音乐识别方面的表现。目的5是评估在听觉区域提供给电极的刺激相对于纯音的音调，并将电音高与耳蜗处电极位置的计算机放射成像评估联系起来。目标6是对滤波带到电极的分配进行研究，以评估(A)根据声电基音匹配为电极分配滤波带是否比标准的滤波带分配产生更好的语音识别，以及(B)通过声和电刺激表示低频是否需要重叠才能达到最高水平的性能。

DESCRIPTION (provided by applicant): The goal of this project is to conduct a study of the speech, voice and music perception abilities of patients who hear with combined electric and acoustic stimulation (EAS) and to relate speech, voice and music perception to underlying psychophysical abilities in the region of acoustic hearing. The goal will be met through experiments and analyses relative to 6 aims. Aim 1 is to characterize low frequency acoustic hearing in patients with residual hearing before and after implantation by assessing auditory thresholds and by obtaining estimates of nonlinear cochlear processing, frequency selectivity and temporal resolution. Aim 2 is to assess the effects of acoustic stimulation alone, electric stimulation alone and combined acoustic and electric stimulation on tests of speech, voice and music recognition. Aim 3 is to determine the relationships among the psychophysical measures of low-frequency acoustic hearing and the measures of speech, voice and music recognition. Aim 4 is to compare the performance of EAS patients, patients with unilateral implants and patients with bilateral implants on measures of speech, voice and music recognition. Aim 5 is to assess the pitch of stimulation delivered to electrodes relative to that of pure tones in the region of acoustic hearing and to relate electrical pitch to computerized radiography assessment of electrode position in the cochlea. Aim 6 is to conduct studies of filter-band-to-electrode assignments in order to assess (a) whether assigning filter-bands to electrodes based on acoustic-electric pitch matching (as in Aim 5) produces better speech recognition than a standard assignment of filter bands and (b) whether overlap in representation of low frequencies by acoustic and electric stimulation is necessary for maximum levels of performance.