Attention allocation in the dual-task paradigm as measured through behavioral and psychophysiological responses
Attention allocation in the dual-task paradigm as measured through behavioral and psychophysiological responses
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DOI：
10.1111/j.1469-8986.2004.00147.x
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发表时间：
2004-03-01
期刊：
影响因子：
3.7
通讯作者：
Marcus, DJ
中科院分区：
文献类型：
--
作者：
Karatekin, C;Couperus, JW;Marcus, DJ
我们采用行为和瞳孔测量的方法研究了双任务范式中的注意分配。我们使用了一个听觉数字广度（DS）和一个简单的视觉反应时间（RT）的任务。参与者接受了四种条件，其中他们不执行任何任务（无任务）、执行单一任务（仅DS或RT）或执行两项任务（双重）。因变量为DS准确性，RT和任务诱发的瞳孔反应（TEPR）的数字作为估计的精神努力。参与者在双DS上保持几乎相同水平的DS准确性，而在RT任务上牺牲了速度。正如预期的那样，TEPR随着仅DS和双DS中的内存负载线性增加。虽然TEPR最初在双高于DS只有，增加的斜率是浅的双。结果表明，TEPRs可以阐明注意力分配的机制，区分有效性（行为表现水平）和效率（心理努力的表现成本）。
We investigated attention allocation in a dual-task paradigm using behavioral and pupillary measures. We used an auditory digit span (DS) and a simple visual response time (RT) task. Participants were administered four conditions in which they performed neither task (no-task), a single task (DS or RT only), or both tasks (dual). Dependent variables were DS accuracy, RT, and task-evoked pupillary responses (TEPRs) to digits as estimates of mental effort. Participants maintained almost the same level of DS accuracy on dual as on DS only and sacrificed speed on the RT task. As expected, TEPRs increased linearly with memory load in both DS only and dual. Although TEPRs were initially higher in dual than in DS only, the slope of the increase was shallower in dual. Results suggest that TEPRs can elucidate mechanisms of attention allocation by distinguishing between effectiveness (level of behavioral performance) and efficiency (the costs of that performance in mental effort).