Can an online mindfulness course protect your brain?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Aged 50 years or greater * Capable of attending screening and assessment sessions and the internet-based intervention modules * Fluent English speaker * Corrected (near and far) visual acuity of 20/40 or better * Adequate hearing for experimental purposes * Absence of diagnosed terminal illness * Absence of diagnosed neurological disorders * No history of psychotic disorder or substance abuse disorder diagnosed by a psychologist or psychiatrist * Absence of medication use that significantly alters brain activity * No history of diagnosed learning disability that would interfere with the completion of the cognitive tasks * Report elevated scores on the self-report Everyday Cognition (E-Cog)-39 subjective cognitive decline with normatively intact performance on cognitive testing (as determined by the neuropsychological battery) * No evidence of mild cognitive impairment or dementia as assessed by the neuropsychological measures from the National Alzheimer's Coordinating Center (NACC) Uniform Data Set OR inadequate self-reported performance of instrumental activities of daily living * Ability to engage in light stretching/movement-based activities with or without assistive devices * Absence of any MRI contraindications * Not pregnant and not attempting to become pregnant * Absence of self-reported claustrophobia * No regular practice of meditation or yoga (defined as once or more per week) AND No previous participation in a structured mindfulness class (e.g., Mindfulness-Based Stress Reduction, intensive meditation retreat) * Access to internet and at-home computer with a working microphone and video * Not enrolled in other RCTs examining the efficacy of exercise training, cognitive rehabilitation, stress management, progressive muscle relaxation or other health-based rehabilitation Exclusion Criteria: * Aged less than 50 years * Any physical or pragmatic limitation that prohibits attendance of screening or assessment sessions, or intervention engagement * No fluency in English * Corrected (near or far) visual acuity worse than 20/40 * Self-reported hearing impairment that would affect ability to hear the experimenter * Diagnosis of terminal illness * Presence of diagnosed neurological disorders such as: Alzheimer's disease, Vascular Dementia, Parkinson's disease, Multiple Sclerosis, Traumatic Brain Injury, Fronto-Temporal Lobar Degeneration, Lewy Body Disease * History of psychotic disorder or substance abuse disorder diagnosed by a psychologist or psychiatrist * Medication use that significantly alters brain activity * History of diagnosed learning disability that would interfere with the completion of the cognitive tasks * Does not report subjective cognitive decline AND/ OR does not perform in the normatively intact range on neuropsychological testing * Evidence of mild cognitive impairment (MCI) or dementia OR inadequate self-reported performance of instrumental activities of daily living * Any physical limitation or pragmatic limitation that prohibits attendance at assessment sessions and intervention modules with or without assistive devices * Presence of MRI contraindications as assessed through the MRI screening form. * Pregnant or attempting to become pregnant * Self-reported claustrophobia * Any regular practice of meditation or yoga (defined as once or more per week) OR Previous participation in a structured mindfulness class (e.g., Mindfulness-Based Stress Reduction, intensive meditation retreat) * No access to internet or at-home computer with a working microphone and video * Current enrollment in other RCTs examining the efficacy of exercise training, cognitive rehabilitation, stress management, progressive muscle relaxation or other health-based rehabilitation