Forty healthy adults (i.e., not recruited with respect to any particular diagnosis) are each alternately provided with supplemental oxygen and air via nasal cannula at about 6 Liters per Minute (LPM), while completing memory tests.

Prior studies have reported that supplemental oxygen can confer acute benefits to cognition. Here, the investigators seek to replicate/extend such findings by assessing whether such benefits can be seen using an Inogen oxygen concentrator with subjects with an average age around 65 years old. The investigators include a standard measure of cognition previously reported to be sensitive to supplemental oxygen (2-back test) and a novel, in-development adaptation of a memory test for medical-related content (Medical icons spatial test).

Inclusion Criteria:

Subjects are intended to represent "healthy adults." Patients will include a mix of self-reported gender and ethnic/racial identification.

1. Provision of signed and dated informed consent form
2. Stated willingness to comply with all study procedures and availability for the duration of the study
3. Adult (aged 22+)

Exclusion Criteria:

• Patients who self-report diagnosis of respiratory-related conditions will be excluded.
• Subjects with a known polyvinyl chloride (PVC) allergy will be excluded, due to potential use of a standard, PVC-based cannula in the study.