Help advance research around non-invasive brain monitoring. What is this study about? Researchers are developing a new non-invasive sensing device that could help patients with stroke and traumatic brain injury. Participants will come to our Palo Alto Office for 30 minutes and site for a 15 minute brain scan with an FDA-approved ultrasound scanner. Why Participate? - You may help those with stroke or traumatic brain injury in the future. - You will be compensated $50 for participating in this study. Who Can Participate? - Fully vaccinated people aged 18 years old or older. - Able to attend 1 study visit at research site in Palo Alto, CA for 30 minutes. - Participants may be invited back by Liminal for a second session. Interested? Join Now Visit us at liminalsciences.com/research