Inclusion Criteria:  Caregivers are fluent/literate in English Caregivers currently reside in the United States with spouse/family member who has received a medical diagnosis of Alzheimer's disease, other dementia, or mild cognitive impairment Caregivers primarily use a smartphone (e.g., iPhone, Android) Caregivers have internet and WiFi service  Exclusion Criteria:  Caregivers providing care for individuals with known non-neurodegenerative conditions affecting behavior and cognition Caregivers providing care for individuals with longstanding Axis I psychiatric disorder Caregivers providing care for individuals with metabolic disorder or major organ dysfunction Caregivers providing care for individuals with alcohol abuse or dependence (within 5 years of dementia onset) Caregivers providing care for individuals with head trauma with loss of consciousness greater than 30 minutes Caregivers providing care for individuals with contraindications to MRI imaging Caregivers providing care for individuals with large confluent white matter lesions Caregivers providing care for individuals with significant systemic medical illness Caregivers providing care for individuals who use a medication likely to affect central nervous system functions adversely