High Frequency Stimulation to Improve Cognition, Mobility, and Affect in Individuals With and Without Subjective Cognitive Decline
The goal is to determine whether three months of at least three times / week of sensory flicker stimulation improves cognition, mobility, and affect in healthy older adults and older adults with and without Subjective Cognitive Decline (SCD). Investigators will also determine whether the intervention slows cortical thinning and declines in brain functional network segregation and changes in blood biomarkers of Alzheimer's Disease (AD).
• Community dwelling men and women 65-89 years old
• Ability to walk unassisted for 10 min
• English speaking Additional Inclusion Criteria for SCD
• No evidence of dementia or MCI based on cognitive screening (i.e., Montreal Cognitive Assessment (MoCA) score within normal limits for age, education, and sex using the NACC Uniform Data Set (UDS) norms
• Global Clinic Dementia Rating (CDR) score must be 0 or 0.531
• Subjective report of cognitive complaints with scores \>20 on the Cognitive Change Index (CCI-20), a validated scale of subjective cognitive decline6; this scale consists of 20 items that are rated on a 5-point Likert scale, where 1= Normal: No change compared to 5 years ago, 3= Mild Problem: Some change compared to 5 years ago) and 5=Severe Problem: Much worse compared to 5 years ago
• Family history of dementia/probable AD in first degree relative (parents, children, siblings)
• Normal functional behavior in terms of daily activities, based on the Functional Activities Scale In line with recommendations of the SCD task force an informant must be available for two reasons: a) to provide information about the participant's cognition using the informant version of the CDR and CCI-20, and b) to corroborate normal IADL's on the Functional Activity Questionnaire (informant data will be collected via a phone call and linked by code with the participant data).