Effects of aging on visuospatial attention: an ERP study
Effects of aging on visuospatial attention: an ERP study
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DOI：
10.1016/s0028-3932(00)00112-3
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发表时间：
2001-01-01
期刊：
影响因子：
2.6
通讯作者：
Strauss, ME
中科院分区：
文献类型：
--
作者：
Curran, T;Hills, A;Strauss, ME
采用事件相关脑电位（ERPs）研究了年龄对视觉空间注意的影响。一个中心箭头指向（75%有效线索）或远离（25%无效线索）即将到来的视觉目标的位置，受试者作出两个选择的歧视。年轻人和老年人对有效线索的反应比无效线索快。老年受试者的提示效应的绝对幅度大于年轻受试者，但当与总体反应时间成比例估计时，两组之间的提示效应相似。在目前的条件下，视觉空间注意的电生理表现是相似的年轻人和老年人。目标刺激（P1，N1，Nd 1）后的早期ERP组件是慢于老年人比年轻的受试者，但幅度在各组中受到同样的影响。成分lavonium和观察到的线索效应之间的时间对应关系是一致的理论假设，注意力放大了早期知觉过程的感官增益。观察到老化减慢同侧而非对侧pi的潜伏期，这与半球间转移时间的年龄差异一致。广泛分布的200-400 ms有效性对ERP振幅的影响在时间、空间分布和幅度方面在组间相似。200-400 ms的注意力效应似乎是对年轻受试者P3的调制，正如早期观察到的那样。然而，本研究将200-400 ms的注意力效应与P3分量分离，因为老年受试者的P3直到526 ms才达到峰值。(C)2001爱思唯尔科技有限公司版权所有。
The effects of aging on visuospatial attention were investigated with event-related brain potentials (ERPs). A central arrow pointed towards (75% valid cues) or away from (25% invalid cues) the location of upcoming visual targets to which subjects made two choice discriminations. Young and older adults responded faster following valid than invalid cues. The absolute magnitude of the cueing effect was larger for older than young subjects, but cueing effects were similar between groups when estimated proportionally to overall response time. Under the present conditions, the electrophysiological manifestations of visuospatial attention were similar for young and older adults. Early ERP components following the target stimulus (P1, N1, Nd1) were slower for older than young subjects, but amplitude was similarly affected by cueing in each group. The temporal correspondence between component latencies and the observed cueing effects are consistent with theories positing that attention amplifies the sensory gain of early perceptual processes. The observation that aging slowed latency of the ipsilateral but not the contralateral pi, is consistent with age differences in interhemispheric transfer times. A broadly distributed 200-400 ms validity effect on ERP amplitude was similar between groups in timing, spatial distribution, and magnitude. The 200-400 ms attention effect appeared to be a modulation of the P3 in younger subjects, as earlier observed. However, the present study dissociated the 200-400 ms attention effects from the P3 component because the P3 did not peak until 526 ms in older subjects. (C) 2001 Elsevier Science Ltd. All rights reserved.