Center for Vital Longevity, University of Texas at Dallas, Dallas, TX, USA; Center for BrainHealth, University of Texas at Dallas, Dallas, TX, USA.
Center for Vital Longevity, University of Texas at Dallas, Dallas, TX, USA.
Neurobiol Aging. 2021 Jan;97:106-119. doi: 10.1016/j.neurobiolaging.2020.10.010. Epub 2020 Oct 17.
Post-retrieval monitoring is associated with engagement of anterior cingulate and dorsolateral prefrontal cortex. Recent fMRI studies reported age-invariant monitoring effects in these regions and an age-invariant correlation between these effects and memory performance. The present study examined monitoring effects during associative recognition (difference in activity elicited by 'rearranged' and 'intact' test pairs) under single and dual (tone detection) task conditions in young and older adults (Ns = 28 per group). It was predicted that, for the older adults only, dual tasking would attenuate memory performance and monitoring effects and weaken their correlation. Consistent with this prediction, in the older group imposition of the secondary task led to lower memory performance and elimination of the relationship between monitoring effects and performance. However, the size of the effects did not differ between single and dual task conditions. The findings suggest that the decline in older adults' memory performance in the dual task condition resulted not from impaired monitoring, but from a different cause that also weakened the dependence of performance on monitoring.
检索后监测与前扣带皮层和背外侧前额叶皮层的参与有关。最近的 fMRI 研究报告了这些区域中与年龄无关的监测效应，以及这些效应与记忆表现之间与年龄无关的相关性。本研究在年轻和老年成年人（每组 n = 28）中，在单个和双重（音调检测）任务条件下，检查了联想识别期间的监测效应（由“重新排列”和“完整”测试对引起的活动差异）。预测对于老年成年人，仅在双重任务下，记忆表现和监测效应会减弱，并且它们之间的相关性会减弱。与该预测一致，在老年组中，施加次要任务会导致记忆表现下降，并消除监测效果与表现之间的关系。然而，在单任务和双任务条件下，效应的大小没有差异。研究结果表明，在双重任务条件下，老年成年人记忆表现的下降不是由于监测受损所致，而是由于另一个原因所致，该原因也削弱了表现对监测的依赖性。
