During sleep, emotional memories are preferentially strengthened. However, most studies on sleep and emotional memory focus on comparing negative valence with neutral valence stimuli. This study compared the sleep-dependent memory effects for stories and images, each comprising negative, neutral, and positive stimuli. It was hypothesized that a sleep effect would be seen for negatively and positively valenced stimuli. A novel story memory task (comprising three stories), and photographs from the Nencki Affective Picture database were presented for learning to 61 healthy adults (ages 18-25). They were tested for memory on the two tasks immediately, and then again after either a 2-hr nap (n = 31; 17 women, 14 men) or 2-hr wake period (n = 30; 13 women, 17 men). At second testing, the sleep condition had significantly better recall compared to the wake condition on both tasks. There was a relationship with valence only for the story task, with better performance for the sleep condition on the negatively and positively valenced texts, but not on the neutral text. There were no significant relationships between memory measures and sleep-stage duration and EEG power variables. The story memory findings support the hypothesis that memory consolidation prioritizes emotional memory, whether positively or negatively valenced.

中文翻译：

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睡眠对正面、​​负面和中性价故事和图像记忆的影响。

在睡眠期间，情绪记忆优先得到加强。然而，大多数关于睡眠和情绪记忆的研究都集中在比较负效价和中性效价刺激。这项研究比较了故事和图像的睡眠依赖性记忆效应，每一个都包括消极、中性和积极的刺激。假设对于消极和积极的价刺激会看到睡眠效应。向 61 名健康成人（18-25 岁）展示了一项新颖的故事记忆任务（包括三个故事）和来自 Nencki 情感图片数据库的照片，以供学习。立即测试他们对这两项任务的记忆力，然后在小睡 2 小时（n = 31；17 名女性，14 名男性）或 2 小时清醒期（n = 30；13 名女性，17 名男性）后再次测试。在第二次测试中，与两项任务的唤醒条件相比，睡眠条件具有明显更好的回忆。仅在故事任务中与价有关系，在消极和积极的价文本上睡眠条件的表现更好，但在中性文本上没有。记忆测量与睡眠阶段持续时间和脑电图功率变量之间没有显着关系。故事记忆的发现支持这样的假设，即记忆巩固优先考虑情绪记忆，无论是正价还是负价。记忆测量与睡眠阶段持续时间和脑电图功率变量之间没有显着关系。故事记忆的发现支持这样的假设，即记忆巩固优先考虑情绪记忆，无论是正价还是负价。记忆测量与睡眠阶段持续时间和脑电图功率变量之间没有显着关系。故事记忆的发现支持这样的假设，即记忆巩固优先考虑情绪记忆，无论是正价还是负价。