Multimodal Investigation of Neural Plasticity

Inclusion Criteria: * Normal cognition for HC and diagnosis of Mild Cognitive Impairment (MCI) for MCI participants * Right-handedness * Magnetic resonance compatible, criteria that also apply for high definition transcranial direct current stimulation (HD-tDCS; e.g., absence of metallic or electronic implants in the upper body or head) Exclusion Criteria: * History of other contributing neurological or medical conditions known to affect cognitive functioning * Significant mental illness * Sensory impairments that limit ability to participate * History of alcohol or drug abuse/dependence