To gined participants’ performance on an episodic memory task administered as part of the MIDUS Cognitive Project
The memory performance task was included as part of a larger battery of cognitive tasks that was administered by computer-assisted telephone interview. Participants were presented with a word list (15 words, e.g., “drum”, “farmer”, “moon”), with a one-second interval between each word. Both immediate and delayed recall were measured by asking participants to repeat back as many words as they could remember. Immediate and delayed recall were combined into a single composite of memory performance and are presented in standard deviation (z-score) units. More details regarding this task can be found on the MIDUS Cognitive Project webpage (Ryff & Lachman, 2017) and in other publications (e.g., Stephan et al., 2014).
Resting Heart Rate Variability (HRV).
To assess cardiovascular health, we examined resting high-frequency heart rate variability (HRV), which was measured during the MIDUS Biomarker Project. HRV was measured in two 300-sec epochs. Due to the high correlation between HRV measurements (r = 0.93), the two were averaged, and log transformed values are presented in this paper and used in the analyses.