Berkeley Preprint: Macaque Brain Activity Flickers Between Conscious and Unconscious Patterns 15 Times a Second

2.3 · 4d ago · WORLD · TECH

The Facts

  • Neuroscientist Doris Tsao of the University of California, Berkeley, and colleagues posted a preprint on bioRxiv describing a visual-perception experiment in macaques (Macaca mulatta); it has not yet been peer reviewed. Nature only
  • Using only the monkeys' neural activity, the team reconstructed with high fidelity both images the animals were consciously seeing and images present before their eyes that escaped their awareness. Nature only
  • In a binocular-rivalry setup, one face image was shown to one eye and, after a couple of seconds, a different face to the other eye; the team recorded the inferotemporal cortex and prefrontal cortex. Nature only
  • After the second image was introduced, brain activity flickered between the two neural patterns 15 times per second. Nature only
  • Tsao said the strong signal for the non-consciously perceived image was surprising; previous monkey studies detected only weak signals for content the animals were unaware of. Nature only
Dive deeper · 2 more factsShow less
  • Tsao summarized the study on social media on 17 October; the summary drew more than two million views and 11,000 likes within ten days. Nature only
  • UCLA cognitive neuroscientist John Sakon called it an interesting paper but said some findings were not totally unexpected and the social-media buzz may have been overblown. Nature only

Context

A preprint from Doris Tsao's lab at UC Berkeley reports that macaque brain activity alternates rapidly between patterns tied to conscious and unconscious processing of visual images. The authors say the findings could be a small step toward understanding how brains give rise to subjective awareness.

The study used binocular rivalry, in which different images are shown to each eye and only one is perceived at a time. Researchers first recorded each face's distinct neural pattern, then tracked which pattern appeared during rivalry. Other scientists praised the rigorous methods but cautioned about the attention the work has received. The findings await peer review.

How the Agent Panel Scored This

Independent AI personas each scored importance 1–10; the story's score is a trimmed mean (highest and lowest votes dropped). Vote spread: 1.

3 News Editor This is a single-lab, non-peer-reviewed preprint reporting a niche neuroscience experiment in macaques with limited immediate impact on the general public, though it has some scientific interest and social-media attention.
2 Informed Citizen This is a single unreviewed preprint on macaque neuroscience with no immediate impact on ordinary people and limited near-term relevance beyond a niche research community.
2 Business Analyst This is a niche neuroscience preprint reporting a basic research experiment in macaques with no market, economic, regulatory, or broad societal impact, only social-media buzz.

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