With the present study as a foundation, future research should evaluate the extent to which variability in mobile cognitive test performance is impacted by fluctuations in time-varying within-person psychosocial/health factors (e.g., stress, affect, control beliefs, pain, sleep) and individual differences in between-person risk factors (presence of chronic pain, presence of chronic stress, depression diagnosis, diabetes status) and ADRD biomarkers such as β amyloid deposition, pathologic tau, and neurodegeneration [AT[N]; (70)]. Here, MAPT is linked to major depressive disorder.