Rajan Vinaya, Bell Martha Ann
University of Delaware, United States.
Virginia Tech, United States.
Dev Cogn Neurosci. 2015 Apr;12:1-11. doi: 10.1016/j.dcn.2014.10.001. Epub 2014 Oct 22.
Source memory involves recollecting the contextual details surrounding a memory episode. When source information is bound together, it makes a memory episodic in nature. Unfortunately, very little is known about the factors that contribute to its formation in early development. This study examined the development of source memory in middle childhood. Measures of executive function were examined as potential sources of variation in fact and source recall. Continuous electroencephalogram (EEG) measures were collected during baseline and fact and source retrieval in order to examine memory-related changes in EEG power. Six and 8-year-old children were taught 10 novel facts from two different sources and recall for fact and source information was later tested. Older children were better on fact recall, but both ages were comparable on source recall. However, source recall performance was poor at both ages, suggesting that this ability continues to develop beyond middle childhood. Regression analyses revealed that executive function uniquely predicted variance in source recall performance. Task-related increases in theta power were observed at frontal, temporal and parietal electrode sites during fact and source retrieval. This investigation contributes to our understanding of age-related differences in source memory processing in middle childhood.
来源记忆涉及回忆与一段记忆事件相关的背景细节。当来源信息被整合在一起时，它使记忆在本质上成为情景性的。不幸的是，对于早期发展中促成其形成的因素我们知之甚少。本研究考察了童年中期来源记忆的发展。执行功能的测量被作为事实和来源回忆中潜在的变异来源进行考察。在基线期以及事实和来源检索过程中收集连续脑电图（EEG）测量数据，以考察EEG功率中与记忆相关的变化。向6岁和8岁儿童教授来自两个不同来源的10个新奇事实，随后测试对事实和来源信息的回忆。年龄较大的儿童在事实回忆方面表现更好，但在来源回忆方面两个年龄组相当。然而，两个年龄组的来源回忆表现都较差，这表明这种能力在童年中期之后仍在继续发展。回归分析显示，执行功能独特地预测了来源回忆表现的变异。在事实和来源检索期间，在额叶、颞叶和顶叶电极部位观察到与任务相关的θ波功率增加。这项调查有助于我们理解童年中期来源记忆加工中与年龄相关的差异。
