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首页> 外文期刊>The European Journal of Neuroscience >Dissociation between top-down attentional control and the time course of visual attention as measured by attentional dwell time in patients with mild cognitive impairment.
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Dissociation between top-down attentional control and the time course of visual attention as measured by attentional dwell time in patients with mild cognitive impairment.

机译：轻度认知障碍患者的自上而下的注意力控制与视觉注意的时间过程之间的关联（通过注意停留时间来衡量）。

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摘要

Studies of the time course of visual attention have identified a temporary functional blindness to the second of sequentially presented stimuli in that the attentional cost of attending to one visual stimulus may lead to impairments in identifying a second stimulus presented within 500 ms of the first. This phenomenon is known as the attentional blink or attentional dwell time. The neural correlates of the attentional blink and its relationship to mechanisms that control attention are unknown. To examine this relationship we tested healthy controls and subjects in the preclinical stage of Alzheimer's disease, known as mild cognitive impairment (MCI), on a paradigm which affords quantification of both the attentional blink and the top-down control of attention. When subjects were asked to identify both a number and a letter that were rapidly and sequentially presented on a visual display, the detrimental effect that identifying the first stimulus had on the ability to identify the second served as a measure of the attentional blink. When asked to identify only one of the two stimuli, the ability to ignore the first stimulus was a function of their top-down attentional control. The MCI subjects demonstrated a normal attentional dwell time but in contrast they showed impaired top-down attentional control within the same paradigm. This dissociation suggests that these two aspects of visual attention are subserved by different neural systems. The possible neural correlates of these two attentional functions are discussed.
机译：对视觉注意力的时程的研究已经确定了对顺序呈现的刺激中的第二种的暂时性功能失明，因为参加一个视觉刺激的注意力成本可能会导致在识别第二种刺激中出现的损害，而第二种刺激是在第一个刺激的500毫秒内出现的。这种现象称为注意眨眼或注意停留时间。注意眨眼的神经相关性及其与控制注意机制的关系。为了检查这种关系，我们测试了阿尔茨海默氏病临床前阶段（称为轻度认知障碍（MCI））的健康对照和受试者，该范式可量化注意眨眼和自上而下的注意力控制。当要求受试者识别在视觉显示器上快速顺序显示的数字和字母时，识别第一种刺激对识别第二种刺激的能力的有害影响可作为注意眨眼的量度。当被要求仅识别两个刺激中的一个时，忽略第一个刺激的能力是其自上而下的注意力控制的功能。 MCI受试者表现出正常的注意力停留时间，但相比之下，他们在同一范式中表现出自上而下的注意力控制受损。这种分离表明视觉注意的这两个方面是由不同的神经系统服务的。讨论了这两个注意功能的可能神经相关性。

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