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The memory benefits of two naps per day during infancy: A pilot investigation
Infant Behavior and Development ( IF 2.671 ) Pub Date : 2021-09-13 , DOI: 10.1016/j.infbeh.2021.101647
Gina M Mason 1 , Laura B F Kurdziel 2 , Rebecca M C Spencer 3
Affiliation  

In infancy, sleep occurs in multiple nap and overnight bouts that change developmentally in quantity and distribution. Though studies suggest that infant memory benefits from a single nap, no work has assessed the relative benefits of different naps (morning vs. afternoon), nor how multiple naps support memory across the day. We investigated the memory benefit of a morning nap, relative to morning wake, and the effect of these intervals on afternoon nap function in 9-month-olds (n = 15). Infants participated in two within-subjects conditions (separated by 1-2 weeks). In the Nap-Nap condition, infants took their morning and afternoon naps; in the Wake-Nap condition, infants were kept awake during morning naptime, but napped unrestricted in the afternoon. Before each nap/wake interval, infants completed an imitation memory task, with memory assessed again shortly after the nap/wake interval. In the Nap-Nap condition, infants showed memory retention across morning and afternoon naps. In contrast, infants tended to forget items learned across morning wake in the Wake-Nap condition. Moreover, morning wake was associated with a significant decline in post-nap retention of items learned in the afternoon. Furthermore, relations between nap slow-wave activity (SWA) and memory varied across naps, with SWA either not predicting (morning naps) or positively predicting (afternoon naps) memory change in the Nap-Nap condition, but negatively predicting afternoon memory change in the Wake-Nap condition. We conclude that two naps per day (rather than one) aids memory at 9 months, and that skipping the morning nap may moderate relations between afternoon nap physiology and memory.



中文翻译:

婴儿期每天小睡两次对记忆的好处:一项试点调查

在婴儿期,睡眠发生在多次午睡和夜间睡眠中,这些睡眠在数量和分布上会发生发育变化。尽管研究表明,一次小睡对婴儿记忆力有好处,但没有工作评估不同小睡(早上与下午)的相对益处,也没有评估过多次小睡如何支持全天的记忆。我们调查了早睡相对于早晨醒来的记忆益处,以及这些时间间隔对 9 个月大的孩子午睡功能的影响(n = 15)。婴儿参加了两个受试者内条件(相隔 1-2 周)。在午睡条件下,婴儿会在早上和下午小睡;在 Wake-Nap 条件下,婴儿在早上的午睡时间保持清醒,但在下午不受限制地午睡。在每个小睡/醒来间隔之前,婴儿完成了一项模仿记忆任务,在小睡/醒来间隔后不久再次评估记忆。在午睡条件下,婴儿在早上和下午的小睡中表现出记忆保留。相比之下,婴儿往往会忘记在 Wake-Nap 条件下早晨醒来时学到的东西。此外,早晨醒来与午睡后下午学习项目的保留率显着下降有关。此外,午睡慢波活动 (SWA) 与记忆之间的关系因午睡而异,SWA 要么不预测(早上小睡),要么积极预测(午睡)午睡条件下的记忆变化,但消极预测午睡条件下的下午记忆变化。 Wake-Nap 条件。我们得出结论,每天两次小睡(而不是一次)有助于 9 个月大的记忆力,并且跳过早睡可能会缓和午睡生理学和记忆力之间的关系。

更新日期:2021-09-13
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