EEG

EEG at the eyewear temple

A dry-contact EEG adapter that slides onto ordinary eyeglass temples, built for recording at home. Designed and patented by Cephalgo, independently tested, and in use in a Horizon Europe study.

Discuss your project → EEG validation report on request

The Cephalgo EEG adapter fitted to a pair of eyeglasses, with its electronics unit on the cord

The adapter

The adapter used in OPADE

Four dry-contact channels on an ordinary pair of glasses.

Recording electrodes Reference

Channels

Four EEG channels

FT9, T9, FT10 and T10, referenced to M1 and M2

Acquisition

24-bit, 250 Hz

Dry-contact electrodes

Connection

Bluetooth LE

To the Cephalgo app on iOS or Android

Patent

US 11,980,470

EEG signal monitoring adapter device configurable on eyewear

Tested

Independently tested

Safety and compliance

Passed SGS safety, ingress and EMC testing.

IEC 62368-1 for electrical safety, IP64 for ingress protection, and EN 301 489-1 and -17, EN 55032 and EN 55035 for electromagnetic compatibility.

Signal validation

Against a widely used EEG system

An independent engineering laboratory recorded the adapter side by side with a widely used wet-electrode EEG system. It concluded that the adapter records scalp EEG with spectral structure comparable to the reference system.

Request the EEG validation report

At rest, eyes closed

Equivalent to the reference

Relative band power was statistically equivalent to the reference system in every participant.

Blinking task

The expected peak on every channel

A clear spectral peak at the blinking frequency on every channel analysed, with a spectral shape similar to the reference system.

Both systems worn at the same time. Equivalence by paired two one-sided tests. From the independent laboratory report, April 2026.

The signal pipeline

From the temple to an analysable window

Every home recording is checked before it reaches analysis.

Step 1

Quality at ingest

Continuity, record eligibility and per-channel availability are checked. Spikes, flat runs and extreme spectral ratios are flagged.

Step 2

Clean windows

Analysis windows come from continuous portions only, filtered and resampled, with channel availability recorded for each window.

Step 3

Per-channel features

Relative delta, theta, alpha and beta power, spectral entropy and multiscale-entropy summaries.

Step 4

Compact decoders

Lightweight convolutional decoders for multivariate biosignals, sized for a wearable.

In the field · OPADE

In a Horizon Europe study of major depressive disorder

The adapter is deployed in OPADE, at sites including Istanbul, Siena and Girona, with patients followed for 24 months. Cephalgo leads the EEG work in OPADE: the hardware, the participant app, and signal processing and quality control.

At home

A third of patients recorded fully at home

Short resting-state sessions on the adapter, with mood questionnaires completed in the same app.

What the recordings showed

EEG change alongside symptom change

Lower relative alpha and higher delta power accompanied symptom reduction, and moved back when symptoms rose again.

From the Cephalgo EEG report to the OPADE consortium, October 2026.

Licensing

Building EEG into a product or a study?

The adapter, the participant app and the signal pipeline are available for licensing.

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