Overview
- Temple released a preprint over Monday and Tuesday reporting a median within-subject correlation of about 0.8 between its proprietary Brain Flow index and transcranial Doppler (TCD) measures in two controlled tests.
- The study tested 23 healthy adults using stationary cycling and a standing-to-lying postural shift and analyzed roughly 20 usable participant records per protocol to compare trends over time.
- Researchers compared Temple’s temple-mounted optical signal with TCD measurements of middle cerebral artery velocity, which measures blood-flow speed rather than total brain blood volume.
- The paper is a preprint that has not been peer reviewed and the authors say the results do not prove the device can measure absolute cerebral blood flow or diagnose conditions.
- While Temple is offering devices to qualified researchers and preparing limited preorders with planned shipments before the end of 2026, independent larger trials and regulatory clarity remain the key next steps for clinical use.