In the current study, we will examine how two types of concentration meditation practices affect plasma biomarkers of Alzheimer's Disease (AD). We will also examine the effects of the two types of meditation practices on emotional well-being and episodic memory. Healthy adults aged 18-35 who meet all eligibility criteria will be invited to this study. Participants will be asked to engage in one week of daily meditation practice or no-intervention control task at home. They will also be asked to visit the lab twice, once before and once after the intervention, to provide blood samples to assess plasma biomarkers of AD and to complete emotion questionnaires and a memory test.