https://techcrunch.com/2023/06/13/this-little-wearable-is-designed-to-detect-blood-flow-to-the-brain/

STAT Health calls the human ear a “biometric gold mine.” The startup, which emerged out of stealth this morning, is talking specifically about cerebral blood flow (CBF). That’s pretty much what it sounds like: the blood supply to the brain measured over a specific length of time. A lack of blood flow to the brain creates all sorts of unpleasantness, like dizziness, fainting, headaches and “brain fog.”

If that last one in particular rings any bells, it’s likely due to ongoing conversations around the cause and symptoms of long Covid. It’s not a medical condition, but it pops up when discussing a variety of impairments. For some time, medical officials have believed that CBF can prove an important biomarker for understanding a variety of conditions.