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# Neurotech companies quietly mining brain data for AI training
- URL: https://adjacent.media/signals/neurotech-companies-quietly-mining-brain-data-for-ai-training/
- Published: 2026-11-05T00:17:49.000Z
- Updated: 2026-11-05T00:17:49.000Z
- Description: Wearable makers have accumulated massive datasets of EEG brain activity from consumer headbands—tens of millions of hours—with minimal user consent or transparency about how that neurological data feeds AI development.
- Author: Jonathan Greene
- Tags: #signal, theme-connected, wearable, IoT, privacy

Source: [Latest News from Science Magazine](https://www.science.org/content/article/wearable-device-makers-are-harvesting-brain-data-train-ai-without-telling-users?ref=adjacent.media)

Wearable makers have accumulated massive datasets of EEG brain activity from consumer headbands—tens of millions of hours—with minimal user consent or transparency about how that neurological data feeds AI development. As the cognitive layer becomes raw material for training, this creates immediate privacy exposure and raises questions about who owns insights derived from individual neural patterns as these devices reach mainstream markets.