Background The ability to monitor one’s own memory is an important feature of normal memory and is an aspect of ‘metamemory’. Lesion studies have shown dissociations between memory and metamemory, but only single dissociations have been shown using transcranial direct current stimulation (tDCS). One potential reason that only single dissociations have been shown is that tDCS effects may be moderated by task difficulty. Objective/Hypothesis We used high definition (HD) tDCS to test for dissociable roles of the dorsolateral prefrontal cortex (DLPFC) and anterior temporal lobe (ATL) in semantic long-term memory and metamemory tasks. We also tested whether general knowledge question difficulty moderated the effects of HD-tDCS. Methods Across 3 sessions, participants received active HD-tDCS over the left DLPFC or left ATL, or sham HD-tDCS during general knowledge recall and recognition tests, and a ‘feeling-of-knowing’ metamemory task. General knowledge questions were blocked by difficulty. Repeated measures ANOVAs were used to examine the effects of HD-tDCS on memory and metamemory tasks by memory question difficulty. Results HD-tDCS over the ATL led to improved recall compared to DLPFC and sham HD-tDCS, and this occurred only for medium difficulty questions. In contrast, for non-recalled questions, HD-tDCS over the DLPFC led to improved recognition accuracy and improved feeling-of-knowing accuracy compared to ATL and sham HD-tDCS, and this was not moderated by memory question difficulty. Conclusion(s) HD-tDCS can be used to dissociate the roles of the ATL and DLPFC in different memory and ‘metamemory’ tasks. The effects of HD-tDCS on task may be moderated by task difficulty, depending on the nature of the task and site of stimulation.

Advanced age is often associated with increased emotional well-being, with older adults reporting more positive and less negative affect than younger adults. Here, we test whether this pattern held during the initial outbreak of the COVID-19 pandemic that disproportionately put older adults at risk. We additionally examine potential moderating effects of daily activity and social connectedness, which have been shown to benefit mental health across the life span. We regularly assessed a large sample of adults ages 18-89 using online surveys. As preregistered for this report (https://osf.io/tb4qv), we focus on selfreported measures of affect, depression, stress, and worry as well as self-reported daily activity and perception of social isolation during two time windows for adults in the United States: early (mid-March to early April) and later (mid-April to early May) periods during the spring phase of the pandemic. Increased age benefited emotional well-being for multiple metrics during both time windows assessed. Furthermore, the results confirmed that exercise and perception of social connectedness can buffer against negative mental health outcomes across all ages, although the beneficial effects of age remained even when controlling for these influences. The one exception was worry about one's own health: Once exercise and social connectedness were controlled, increased age was associated with more worry. The results overall suggest that, at least among adults with access to technology, older age was associated with greater resilience during the spring phase of the pandemic. Thus, increased resilience of older adults demonstrated previously extends to the context of the onset of a pandemic.

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The initial phase of the coronavirus disease 2019 (COVID-19) pandemic changed our lives dramatically, with stay-at-home orders and extreme physical distancing requirements. The present study suggests that how adults remember these disruptions depends, in part, on their age. In two surveys collected from American and Canadian participants during Summer 2020 (n = 551) and Fall 2020 (n = 506), older age (across ages 18-90 years) was associated with greater reflections on positive aspects of the initial phase of the pandemic. While the pandemic is a shared experience, the way it is remembered may differ across generations, with older age leading to a greater focus on the positive aspects.