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首页> 外文期刊>Brain and cognition >Partial sleep deprivation does not alter processes involved in semantic word priming: Event-related potential evidence
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Partial sleep deprivation does not alter processes involved in semantic word priming: Event-related potential evidence

机译：部分睡眠剥夺不会改变语义词启动过程：与事件相关的潜在证据

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Sleep deprivation has generally been observed to have a detrimental effect on tasks that require sustained attention for successful performance. It might however be possible to counter these effects by altering cognitive strategies. A recent semantic word priming study indicated that subjects used an effortful predictive-expectancy search of semantic memory following normal sleep, but changed to an automatic, effortless strategy following total sleep deprivation. Partial sleep deprivation occurs much more frequently than total sleep deprivation. The present study therefore employed a similar priming task following either 4 h of sleep or following normal sleep. The purpose of the study was to determine whether partial sleep deprivation would also lead to a shift in cognitive strategy to compensate for an inability to sustain attention and effortful processing necessary for using the predicative expectancy strategy. Sixteen subjects were presented with word pairs, a prime and a target that were either strongly semantically associated (cat...dog), weakly associated (cow...barn) or not associated (apple...road). The subject's task was to determine if the target word was semantically associated to the prime. A strong priming effect was observed in both conditions. RTs were slower, accuracy lower, and N400 larger to unassociated targets, independent of the amount of sleep. The overall N400 did not differ as a function of sleep. The scalp distribution of the N400 was also similar following both normal sleep and sleep loss. There was thus little evidence of a difference in the processing of the target stimulus as a function of the amount sleep. Similarly, ERPs in the period between the onset of the prime and the subsequent target also did not differ between the normal sleep and sleep loss conditions. In contrast to total sleep deprivation, subjects therefore appeared to use a common predictive expectancy strategy in both conditions. This strategy does however require an effortful sustaining of attention, and may not have been entirely successful when sleep was restricted. A slight but significant decrease in accuracy was noted.
机译：通常观察到睡眠剥夺对需要持续关注才能成功执行的任务有不利影响。但是，可以通过改变认知策略来抵消这些影响。最近的语义词启动研究表明，受试者在正常睡眠后对语义记忆进行了努力的预期预期搜索，但在完全睡眠剥夺后变为自动，轻松的策略。部分睡眠剥夺比完全睡眠剥夺更为频繁。因此，本研究在睡眠4小时或正常睡眠后采用了类似的启动任务。该研究的目的是确定部分睡眠不足是否还会导致认知策略的转变，以弥补无法维持注意力和使用预期性预期策略所需的费力处理。向16个主题提供了单词对，一个素词和一个目标，它们在语义上紧密相关（猫...狗），弱相关（牛...谷仓）或不相关（苹果...路）。对象的任务是确定目标单词是否与素数在语义上相关联。在两种情况下均观察到强的启动作用。 RTs较慢，准确度较低，N400对未关联的目标较大，与睡眠量无关。整个N400的睡眠功能没有差异。在正常睡眠和失眠后，N400的头皮分布也相似。因此，几乎没有证据表明目标刺激的处理与睡眠量有关。同样，在初次发作和随后的发作之间，ERPs在正常睡眠和失眠状态之间也没有差异。与完全睡眠剥夺相反，受试者因此似乎在两种情况下都使用共同的预期预期策略。然而，这种策略确实需要努力保持注意力，并且当睡眠受限时可能并不完全成功。注意到准确性略有但显着下降。

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