Heart Rate and Breathing Effects on Attention and Memory

Inclusion Criteria: * speak English fluently * between the age of 50-70 * healthy adult who weighs at least 110 pounds * non-pregnant and non-menstruating (for at least the past year) * normal or corrected-to-normal vision and hearing * have a home computer with a physical keyboard and have access to reliable internet * have an email account that you check regularly * have a phone that receives text messages * willing to provide a blood sample and a urine sample at three lab visits * willing to devote up to 60 minutes daily to the study for 12 weeks (in addition to lab visits) Exclusion Criteria: * have a disorder that would impede performing the breathing intervention (e.g., abnormal cardiac rhythm, heart disease including coronary artery disease, angina, and arrhythmia, cognitive impairment, dyspnea) * regularly practicing any relaxation, biofeedback, or breathing technique (e.g., meditation) for more than an hour a week * regularly played Lumosity games in the past 6 months * participated in heart rate biofeedback studies in the USC Emotion \& Cognition Lab * have any conditions listed below that are not safe for MRI * Claustrophobia * Have worked as a machinist, metal worker, or in any profession or hobby grinding metal? * Have had an injury to the eye involving a metallic object (e.g., metallic slivers, shavings, or foreign body) * Cardiac pacemaker * Implanted cardiac defibrillator * Aneurysm clip or brain clip * Carotid artery vascular clamp * Neurostimulator * Insulin or infusion pump * Spinal fusion stimulator * Cochlear, otologic, ear tubes or ear implant * Prosthesis (eye/orbital, penile, etc.) * Implant held in place by a magnet * Heart valve prosthesis * Artificial limb or joint * Other implants in body or head * Electrodes (on body, head or brain) * Intravascular stents, filters * Shunt (spinal or intraventricular) * Vascular access port or catheters * IUD * Transdermal delivery system or other types of foil patches (e.g., Nitro, Nicotine, Birth control, etc.) that cannot be removed for MRI * Shrapnel, buckshot, or bullets * Tattooed eyeliner or eyebrows * Body piercing(s) that cannot be removed for MRI * Metal fragments (eye, head, ear, skin) * Internal pacing wires * Aortic clips * Metal or wire mesh implants * Wire sutures or surgical staples * Harrington rods (spine) * Bone/joint pin, screw, nail, wire, plate * Wig or toupee that cannot be removed for MRI * Hair implants that involve staples or metal * Hearing aid(s) that cannot be removed for MRI * Dentures or retainers that cannot be removed for MRI