Neural Noise- A wearable fNIRS platform enables dense sampling and precision functional neuroimaging (Nature).1
- The approach advances mobile/wearable fNIRS for BCI and neuroimaging pipelines and supports neural/physiological time-series methods.1 1
Weekly enrichment (2026-07-20)
- The primary study is a proof-of-concept published in npj Digital Medicine in which eight healthy young adults (five female, three male; mean age 26.13 ± 5.99 years) each completed ten measurement sessions across three weeks, with sessions lasting roughly 45 minutes.2
- The custom fNIRS headband uses five sources emitting two wavelengths (740 and 850 nm) and twelve detectors, yielding 17 long-separation channels (2.8 cm) plus 8 short-separation channels (0.9 cm) covering the prefrontal cortex.2
- Participants performed N-back, Flanker, and Go/No-go tasks plus resting state, contributing 70 minutes of resting-state and 210 minutes of task fNIRS each; behavioral accuracy was high (N-back 90 ± 6%, Flanker 92 ± 4%, Go/No-go 88 ± 8%).2
- Test-retest reliability of functional connectivity was low (as low as 0.25) for a single 7-minute session but rose sharply to 0.92 once roughly 49 minutes (seven sessions) of data were concatenated.2
- Within-participant connectivity matrices were more similar to each other than across participants, demonstrating individual-specific “fingerprints”; augmented-reality tablet guidance ensured reproducible placement and a cloud portal enabled remote access.2
- Group-level activation only became statistically significant after concatenating all sessions (for example N-back left orbitofrontal cortex t = 3.63, p_FDR = 0.01), whereas single-session data produced no robust activation.2
- For context, high-density diffuse optical tomography (HD-DOT) with dense, spatially overlapping optodes approaches the resolution and localization accuracy of BOLD-fMRI, but historically required bulky fiber arrays.3
- Optode grid density carries an ergonomic cost: fiber-based systems spaced at 6.5 mm are about 4x heavier than 13-mm systems, whereas emerging fiberless/wireless designs avoid that weight penalty.4
- Clinical/BCI implication: portable at-home fNIRS could supply ecologically valid biomarkers for precision mental health, though larger and clinical cohorts are still required.2