What Does Temple Device Actually Do? Know What Recent Study Shows
Deepinder Goyal’s Temple wearable shows stronger correlation with brain blood volume than scalp signals in a second validation study against time-domain NIRS. Tests on healthy men during head-down tilt and postural changes yielded correlations of 0.84-0.91 with brain-layer signals. The preprint follows an earlier Doppler study and remains subject to peer review.
Deepinder Goyal’s Temple wearable has released findings from its second validation study, showing the Brain Flow index correlates more strongly with brain blood volume changes than with scalp signals. The preprint, posted on bioRxiv and submitted for peer review, tested the temple-worn optical device against depth-resolved time-domain near-infrared spectroscopy (TD-NIRS) in controlled postural challenges.
Temple Brain Flow Validation Against NIRS
Sixty sessions involving 44 healthy young adult men examined three physiological challenges: 30-degree head-down tilt, stand-to-squat, and stand-to-supine transitions. Researchers used a multi-module TD-NIRS system and a two-layer model to separate scalp-layer and brain-layer haemoglobin signals. Temple 1st Validation Study: Deepinder Goyal Shares Brain Flow Validation Study of Wearable Health Device.
Temple Device Study Shows It Monitors Blood Flow to Brain?
Median lag-adjusted correlations between Temple’s Brain Flow index and the brain-layer oxygenated haemoglobin changes reached 0.912 for head-down tilt, 0.843 for stand-to-squat, and 0.839 for stand-to-supine. Corresponding scalp-layer correlations were lower at 0.494, 0.700 and 0.767. The difference was statistically significant for the first two challenges. Associations held after adjustments for heart rate and superficial signals. Transition responses moved in the same direction in 59 of 60 sessions.
Why Continuous Cerebral Monitoring Matters
Cerebral blood flow responds to exercise, cold exposure, meditation, sleep quality, prolonged sitting and hydration. Until recently, such measurements were limited to clinical settings and single snapshots. Temple aims to provide continuous, real-time relative tracking during daily life. The company states this is the only wearable currently validated against brain blood volume rather than scalp signals alone.
This follows an earlier September 2026 preprint comparing Temple’s Brain Flow index with transcranial Doppler ultrasound in 23 healthy adults during cycling and postural shifts, which reported within-subject correlations around 0.8. Temple Acquires Longevous: Deepinder Goyal's Healthtech Startup Acquires London-Based Longevity Firm.
Scientific Oversight and Limitations
The study was guided by Professor David Boas, director of Boston University’s Neurophotonics Center and a Temple scientific adviser. Temple Private Limited funded and conducted the work. Authors note the results support the index as a relative marker of cerebral hemodynamic change during postural perturbations. Further work is needed to confirm cerebral specificity, exclude residual systemic and superficial contributions, and test broader populations. The papers remain preprints pending peer review. Temple positions the device for general wellness rather than medical diagnosis or treatment.
(The above story first appeared on LatestLY on Sep 26, 2026 07:59 AM IST. For more news and updates on politics, world, sports, entertainment and lifestyle, log on to our website latestly.com).