Assessing age-related multisensory enhancement with the time-window-of-integration model
Assessing age-related multisensory enhancement with the time-window-of-integration model
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DOI：
10.1016/j.neuropsychologia.2008.03.026
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发表时间：
2008-08-01
期刊：
影响因子：
2.6
通讯作者：
Schomburg, Annette
中科院分区：
文献类型：
--
作者：
Diederich, Adele;Colonius, Hans;Schomburg, Annette
尽管通过多感官研究，人们对不同感官如何相互作用有了很多了解，但关于衰老对这些多感官过程的影响却知之甚少。在这项研究中，我们测量了老年人和年轻人在有或没有辅助听觉刺激（集中注意力任务）的情况下对视觉目标刺激开始的扫视反应时间（SRT）。两组的响应时间模式相似：双峰刺激的平均 SRT 通常短于单峰刺激，并且当听觉附件出现在目标的同侧而不是对侧时，平均双峰 SRT 更短。在所有条件下，老年参与者都比年轻参与者慢得多，但表现出更大的多感官增强，也就是说，他们似乎从双峰刺激呈现中受益更多。为了权衡外周感觉过程相对于可能造成年轻人和老年人差异的更中枢认知过程的贡献，作者开发了眼跳眼动跨模态相互作用的整合时间窗口（TWIN）模型，该模型与两组数据进行了拟合。模型参数表明（i）老年人的外周感觉处理速度减慢，（ii）由于这种减慢，即使整合时间窗口较长，老年人的整合概率也较小，（iii）多感觉整合如果发生，则表现为老年人更大的神经增强；然而，由于（ii），平均而言，整合效应不足以补偿老年人的外周减慢。 (C) 2008 Elsevier Ltd. 保留所有权利。
Although from multisensory research a great deal is known about how the different senses interact, there is little knowledge as to the impact of aging on these multisensory processes. In this study, we measured saccadic reaction time (SRT) of aged and young individuals to the onset of a visual target stimulus with and without an accessory auditory stimulus occurring (focused attention task). The response time pattern for both groups was similar: mean SRT to bimodal stimuli was generally shorter than to unimodal stimuli, and mean bimodal SRT was shorter when the auditory accessory was presented ipsilaterally rather than contralaterally to the target. The elderly participants were considerably slower than the younger participants under all conditions but showed a greater multisensory enhancement, that is, they seem to benefit more from bimodal stimulus presentation. In an attempt to weigh the contributions of peripheral sensory processes relative to more central cognitive processes possibly responsible for the difference in the younger and older adults, the time-window-of-integration (TWIN) model for crossmodal interaction in saccadic eye movements developed by the authors was fitted to the data from both groups. The model parameters suggest that (i) there is a slowing of the peripheral sensory processing in the elderly, (ii) as a result of this slowing, the probability of integration is smaller in the elderly even with a wider time-window-of-integration, and (iii) multisensory integration, if it occurs, manifests itself in larger neural enhancement in the elderly; however, because of (ii), on average the integration effect is not large enough to compensate for the peripheral slowing in the elderly. (C) 2008 Elsevier Ltd. All rights reserved.