Our work in this area aims to understand how age-related cognitive changes may be mediated by rest-activity cycles. Using actigraphy, we assess how rest-activity measures, especially rhythm fragmentation, are related to neural markers that play a role in decision making and associative learning. In collaboration with the Worthy Lab and Caprock fMRI Lab, we hope to better understand how the neural and computational mechanisms involved in history-dependent and history-independent decision making may differ across the lifespan. In addition, through collaboration with the Preston Lab we aim to investigate the role of rest-activity rhythms in hippocampal pattern completion in memory-based decision making (Preston and Mack, 2016).