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为什么高兴的时候时间总是溜得那么快？高兴的时候，总感觉时间飞逝，而无聊的时候，时间好像怎么也过不完，这到底是怎么回事呢？怎样让高兴的时候时间过得慢一点儿呢？
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Scientists have come up with a theory for why time flies when you are having fun-- and drags when you are bored.
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科学家们提出理论依据，解释为什么当你玩得开心的时候，时间总是过得飞快，而当你无聊的时侯，时间却过得特别慢。
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Scans have shown that patterns of activity in the brain change depending on how we focus on a task.
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通过扫描发现，大脑活动的方式随着我们对事情的关注程度发生变化。
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Concentrating on time passing, as we do when bored, will trigger brain activity which will make it seem as though the clock is ticking more slowly.
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我们在无聊的时候，往往把注意力集中在时间的流逝上，这样会使大脑活动产生错觉，总觉得时钟似乎走得更慢
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The research, by the French Laboratory of Neurobiology and Cognition, is published in the magazine Science.
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法国神经生物和认知学实验室进行的此项研究发表在《科学》杂志上。
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In the study, 12 volunteers watched an image while researchers monitored their brain activity using MRI scans.
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在研究中，当12名志愿者同时看一幅图像时，研究者们用核磁共振成像扫描仪来监控他们大脑的活动。
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Volunteers were given a variety of tasks. In one they were told to concentrate simply on the duration of an image, in another they were asked to focus on the colour, and in a third they were asked to concentrate on both duration and colour.
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志愿者们被分配了各种不同的任务。一次他们被要求专注于图象持续的时间，另一次集中观察图象的色彩，第三次同时关注图象持续的时间和色彩。
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The results showed that a network of brain regions was activated when more subjects were paid attention to duration.
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结果表明，在观看图像的过程中，注意的对象多的话，就会激活大脑区域网络。
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It is thought that if the brain is busy focusing on many aspects of a task, then it has to spread its resources thinly, and pays less heed to time passing.
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科学家们认为如果大脑忙于关注一项任务中的多个方面，那么它不得不分散注意力，这样就不太会注意到时间的流逝。
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Therefore, time passes without us really noticing it, and seems to go quickly.
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所以，我们还没真正注意到时间，时间就已经过去了，而且似乎过得特别快。
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However, if the brain is not stimulated in this way, it concentrates its full energies on monitoring the passing of time.
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然而，如果大脑并没有受到这样的刺激，它就会把全部精力用来监控时间的流逝。
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This may make time seem to drag, but in fact it is probably a more accurate perception of reality.
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这样就会觉得时间过得特别慢，但是事实上这可能是对现实情况的更准确的认识。
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Indeed, the researchers found that the more volunteers concentrated on the duration of the images, the more accurate were their estimates of its duration.
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事实上，研究者们发现，志愿者们越是注意图像持续的时间，他们对于时间的估计就越准确。
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Lead researcher Dr Jennifer Coull said many of the areas of the brain involved in estimating time were the same that played a key role in controlling movement, and preparing for action.
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主任研究员詹尼弗·库尔博士说，大脑中有许多参与估计时间的区域，同时他们对行为控制和行动准备也起到重要的作用。
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She said this overlap suggests that the brain may make sense of time as intervals between movements, in much the same way as a musician marks time with his foot, or an athlete anticipates the sound of a starter's pistol.
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她说这种区域重合说明大脑在活动的间隙可能会注意到时间，在很大程度上就像音乐家用脚来记录时间、运动员预料发令员的枪声一样。
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