Consumer EEG headset · Grey Matter

A consumer EEG headset is a wearable that records the brain's electrical activity through a few electrodes resting on the scalp or in the ears and turns it into scores of focus, calm or sleep, sold for meditation, productivity or games, mostly as a wellness product that no medical regulator reviews.

Consumer EEG headset. A consumer EEG headset is a wearable that records the brain's electrical activity through a few electrodes resting on the scalp or in the ears and turns it into scores of focus, calm or sleep, sold for meditation, productivity or games, mostly as a wellness product that no medical regulator reviews.

It is EEG stripped to what can be put on in seconds. The contacts are dry, or felt pads wet with saline, placed where hair does not get in the way: the forehead and behind the ears on InteraXon's Muse headband (four channels), one forehead sensor and an ear clip on NeuroSky's MindWave, five or fourteen points on Emotiv's Insight and EPOC, and since 2024 twelve fabric sensors in the ear cushions of headphones made by Neurable with Master & Dynamic. Without gel the contact is poor, and a brain signal of some tens of microvolts competes with blinks, jaw muscles and movement, so the apps mostly track the power in broad frequency bands (alpha grows as a person relaxes) and show it as a score.

The signal is weak and still personal. A 2012 study showed that software for an Emotiv headset could flash pictures of banks, digits and places and read the brain's recognition response, cutting the uncertainty about a user's PIN, bank or home area by about 15 to 40 % compared with guessing.

The companies keep the data. A NeuroRights Foundation review in April 2024 of 30 consumer neurotechnology companies found that 29 appeared to have access to their users' neural data with no meaningful limits on it.

These products produced the first legal cases. In August 2023 Chile's Supreme Court, applying Chile's neurorights amendment, ordered Emotiv to delete the data its Insight headset had collected from the former senator Guido Girardi, and the US state neural data laws of 2024 were written with these devices in view.

A consumer EEG headset reads little and keeps it.

Its recordings are too coarse to decode thoughts, yet they are stored, tied to a named person and open to better analysis later, which is why the first ruling and the first laws on mental privacy concerned these products.

Questions: Does US law protect the recordings of a consumer EEG headband? In some states it does, and these headbands are the case the laws were written for. Colorado in April 2024 and California in September 2024 added neural data to the sensitive data of their consumer privacy acts, so in Colorado a company needs a user's consent before processing the recordings, and in California users can limit their use to the service they asked for and have them deleted. Federal law has no equivalent: a headband sold for wellness falls outside medical privacy rules, and elsewhere its data are governed mostly by the company's own policy, and a 2024 review found that 29 of 30 companies appeared to keep access to them with no meaningful limits. How does a consumer EEG headband differ from the EEG a hospital records? A clinical EEG places 19 or more electrodes over the whole head in the standard 10-20 layout, each fixed with conductive gel after the skin is prepared, so the contact is good and every lobe is covered. A headband such as Muse uses four dry electrodes on the forehead and behind the ears, where there is no hair, so it sees mainly the front and the sides of the head and records more blinks and jaw tension along with the brain. It can follow broad changes such as alpha rising when a person relaxes or closes the eyes, and it cannot locate a seizure or support a diagnosis.