Investigating Mild Cognitive Impairment in Patients And Controls With TD-fNIRS

Inclusion Criteria: Patients * Must have a diagnosis of MCI (amnesiac or non-amnesiac) as determined by clinician * Adults (older adults) between the ages of 55-85 years inclusive at time of enrollment * Ability to perform informed consent on their own * Fluent in English (speaking and reading) Healthy Controls * Adults (older adults) between the ages of 55-85 years inclusive at time of enrollment * Ability to perform informed consent on their own * Fluent in English (speaking and reading) Exclusion Criteria: Patients * Alzheimer's or dementia diagnosis * Current substance or alcohol dependence, and/or alcohol or substance abuse as determined by CAGE-AID assessment for drug and alcohol abuse. A score of 2 or higher would result in exclusion. * Has uncorrected major visual or auditory deficits that would prevent them from completing a study task * Current or recent (in the past 6 months) chemotherapy and/or radiation for any cancer * Major medical illnesses and psychiatric conditions (other than MCI) including: * Severe/uncontrolled Diabetes, hypertension and hypothyroidism that could pose secondary causes of cognitive decline * Parkinson's disease * Motor neuron diseases * Multiple Sclerosis * Brain Tumor * Stroke * Encephalitis * Meningitis * Epilepsy * TBI with serious results (coma, unconscious for \>2 hrs, or skull fracture) * Current serious psychiatric conditions (bipolar disorder, schizophrenia, or psychosis) Healthy Controls * Prior MCI or memory impairment diagnosis * First-degree relative with dementia or clinically relevant memory problems * Alzheimer's or dementia diagnosis * Current substance or alcohol dependence, and/or alcohol or substance abuse as determined by CAGE-AID assessment for drug and alcohol abuse. A score of 2 or higher would result in exclusion. * Has uncorrected major visual or auditory deficits that would prevent them from completing a study task * Current or recent (in the past 6 months) chemotherapy and/or radiation for any cancer * Major medical illnesses and psychiatric conditions including: * Severe/uncontrolled Diabetes, hypertension and hypothyroidism that could pose secondary causes of cognitive decline * Parkinson's disease * Motor neuron diseases * Multiple Sclerosis * Brain Tumor * Stroke * Encephalitis * Meningitis * Epilepsy * TBI with serious results (coma, unconscious for \>2 hrs, or skull fracture) * Current serious psychiatric conditions (bipolar disorder, schizophrenia, or psychosis)