Cleary Miranda, DeRoy Milvae Kristina, Nguyen Nicole, Bernstein Joshua G W, Goupell Matthew J
Department of Hearing and Speech Sciences, University of Maryland, College Park, MD, USA.
Department of Communicative Disorders and Sciences, University at Buffalo, Buffalo, NY, USA.
medRxiv. 2023 Jan 9:2023.01.06.23284274. doi: 10.1101/2023.01.06.23284274.
Bilateral cochlear-implant users experience interaural frequency mismatch because of asymmetries in array insertion and frequency-to-electrode assignment. To explore the acute perceptual consequences of such mismatch, sentence recognition in quiet was measured in nine bilateral cochlear-implant listeners as frequency allocations in the poorer ear were shifted by ±1.5, ±3 and ±4.5 mm using experimental programs. Shifts in frequency allocation >3 mm were found to reduce bilateral sentence scores below those for the better ear alone, suggesting that the poorer ear interfered with better-ear perception. This was not a result of fewer active channels; deactivating electrodes without frequency shifting had minimal effect.
双侧人工耳蜗使用者会因电极阵列插入及频率与电极分配的不对称性而出现双耳频率失配。为探究这种失配的急性感知后果，通过实验程序将9名双侧人工耳蜗使用者较差耳的频率分配分别上下移动±1.5、±3和±4.5毫米，测量了他们在安静环境下的句子识别能力。结果发现，频率分配偏移超过3毫米会使双侧句子得分低于仅使用较好耳时的得分，这表明较差耳会干扰较好耳的感知。这并非是由于激活通道减少所致；在不改变频率的情况下停用电极影响极小。
