School of Medical Sciences, University of Sydney, Sydney, NSW 2006, Australia.
J Acoust Soc Am. 2011 Nov;130(5):2939-50. doi: 10.1121/1.3641400.
This work was aimed at determining whether binaural interference occurs in electric hearing, and if so, whether it occurs as a consequence of perceptual grouping (central explanation) or if it is related to the spread of excitation in the cochlea (peripheral explanation). Six bilateral cochlear-implant listeners completed a series of experiments in which they judged the lateral position of a target pulse train, lateralized via interaural time or level differences, in the presence of an interfering diotic pulse train. The target and interferer were presented at widely separated electrode pairs (one basal and one apical). The results are broadly similar to those reported for acoustic hearing. All listeners but one showed significant binaural interference in at least one of the stimulus conditions. In all cases of interference, a robust recovery was observed when the interferer was presented as part of an ongoing stream of identical pulse trains, suggesting that the interference was at least partly centrally mediated. Overall, the results suggest that both simultaneous and sequential grouping mechanisms operate in electric hearing, at least for stimuli with a wide tonotopic separation.
这项工作旨在确定双耳干扰是否会出现在电听觉中，如果存在，这种干扰是由于感知分组（中央解释）引起的，还是与耳蜗中的兴奋扩散（外围解释）有关。六位双侧人工耳蜗植入者完成了一系列实验，他们在存在干扰的双声道脉冲串的情况下，通过耳间时间或水平差异来判断目标脉冲串的横向位置。目标和干扰器在电极对（一个基底和一个顶点）上广泛分离的位置呈现。结果与声学听觉的报告大致相似。除了一个人之外，所有的听众在至少一种刺激条件下都表现出显著的双耳干扰。在所有干扰的情况下，当干扰器作为相同脉冲串流的一部分呈现时，观察到了强大的恢复，这表明干扰至少部分是中枢介导的。总的来说，结果表明，在电听觉中，至少对于具有广泛音调分离的刺激，同时和顺序分组机制都在起作用。
