Neural Correlates of Auditory-Cognitive Processing in Older Adult Cochlear Implant Recipients
Neural Correlates of Auditory-Cognitive Processing in Older Adult Cochlear Implant Recipients
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DOI：
10.1159/000371602
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发表时间：
2014-01-01
影响因子：
1.6
通讯作者：
Muchnik, Chava
中科院分区：
文献类型：
--
作者：
Henkin, Yael;Yaar-Soffer, Yifat;Muchnik, Chava
随着越来越多的老年人接受人工耳蜗植入（CI），人们普遍认为可以获得实质性的好处。尽管如此，言语感知性能的变异性很高，外周，中枢听觉和认知因素之间的相对贡献和相互作用还没有完全理解。本研究的目的是通过高负荷认知任务的行为和电生理表现，比较老年人CI接受者与老年听力正常（NH）听众的认知加工。对9名年龄大于60岁的CI患者和10名年龄匹配的NH患者进行听觉Stroop任务，记录听觉事件相关电位（AERPs）。受试者被要求对说话者的性别（男/女）进行分类，从而产生“母亲”或“父亲”，而忽略不相关的一致或不一致的词义。年长的CI和NH听众表现出相当的反应时间，性能的准确性，和初始的感官知觉处理（即N1电位）。尽管如此，老年CI收件人表现出显着延长和效率较低的感知处理（即P3电位）。一致性效应表现在较长的反应时间（即Stroop效应），执行时间，P3潜伏期不一致与一致的刺激，在两组以类似的方式，但是，显着延长P3和缩短执行时间是明显的老年CI收件人。总的来说，老年人（CI和NH）采用了相结合的知觉和知觉后冲突的处理策略，尽管如此，相对分配的知觉资源大大提高，以保持足够的性能在CI收件人。总之，记录的AERPs与同时获得的行为措施在Stroop任务暴露了不同的时间过程中的认知加工在老年CI收件人，不表现在行为的最终产品的处理。这些数据可能对临床评估和康复程序有影响，这些程序应该专门为这一独特的患者群体量身定制。(C)2015 S. Karger AG，巴塞尔
With the growing number of older adults receiving cochlear implants (CI), there is general agreement that substantial benefits can be gained. Nonetheless, variability in speech perception performance is high, and the relative contribution and interactions among peripheral, central-auditory, and cognitive factors are not fully understood. The goal of the present study was to compare auditory-cognitive processing in older-adult CI recipients with that of older normal-hearing (NH) listeners by means of behavioral and electrophysiologic manifestations of a high-load cognitive task. Auditory event-related potentials (AERPs) were recorded from 9 older postlingually deafened adults with CI (age at CI > 60) and 10 age-matched listeners with NH, while performing an auditory Stroop task. Participants were required to classify the speaker's gender (male/female) that produced the words 'mother' or 'father' while ignoring the irrelevant congruent or incongruent word meaning. Older CI and NH listeners exhibited comparable reaction time, performance accuracy, and initial sensory-perceptual processing (i.e. N1 potential). Nonetheless, older CI recipients showed substantially prolonged and less efficient perceptual processing (i.e. P3 potential). Congruency effects manifested in longer reaction time (i.e. Stroop effect), execution time, and P3 latency to incongruent versus congruent stimuli in both groups in a similar fashion; however, markedly prolonged P3 and shortened execution time were evident in older CI recipients. Collectively, older adults (CI and NH) employed a combined perceptual and postperceptual conflict processing strategy; nonetheless, the relative allotment of perceptual resources was substantially enhanced to maintain adequate performance in CI recipients. In sum, the recording of AERPs together with the simultaneously obtained behavioral measures during a Stroop task exposed a differential time course of auditory-cognitive processing in older CI recipients that was not manifested in the behavioral end products of processing. These data may have implications regarding clinical evaluation and rehabilitation procedures that should be tailored specifically for this unique group of patients. (C) 2015 S. Karger AG, Basel