Consciousness depends not on how much information the brain moves, but on how precisely it directs that flow, according to new research from Kyoto University published in the journal Neuroscience News on July 23, 2026.
The research
A team led by corresponding author Yutaka Komura at Kyoto University set out to find direct physical evidence for a long-held hypothesis: that conscious perception requires both encoding external features and transmitting information across cortical regions.
To investigate, the researchers developed high-density custom electrocorticography (ECoG) arrays covering most of the cerebral cortex of a rat's right hemisphere. This allowed them to record traveling waves — electrical activity that propagates across the brain like ripples in a pond. They then analyzed the signals using transfer entropy, a mathematical metric that quantifies the directional flow of information.
Simulation results showed that the mere presence of traveling waves does not guarantee information transfer. However, the team confirmed that in the cerebral cortex, information flows selectively along the propagation direction of the traveling waves — a phenomenon they call “informational tuning.” The resulting tuning curves were significantly sharper during wakefulness compared to anesthesia.
Surprisingly, the absolute amount of transfer entropy was higher during anesthesia than in wakefulness. As Komura explained, “This unexpected finding suggests that while the anesthetized brain is flooded with random, noisy information, the awake brain selectively regulates information in specific directions. In other words, the awake brain excels in the ‘reliability’ and precision of information communication, rather than just the raw quantity.”
By marrying the biological reality of traveling waves with the mathematical rigor of transfer entropy, the study provides a quantitative metric to evaluate the efficiency of information transmission between cortical regions.
Why it matters
This research suggests that consciousness is less about the volume of neural chatter and more about the directional clarity of that chatter. The awake brain acts like a well-tuned radio, filtering out noise to receive a clear signal, while anesthesia turns the brain into a room full of static. For anyone interested in cognition, this underscores that mental sharpness may depend on the brain's ability to organize information flow, not just its overall activity level.
Understanding informational tuning could lead to better ways to assess consciousness in clinical settings and to design brain-training approaches that target the precision of neural communication.
What you can do
- Prioritize sleep: Sleep helps maintain the brain's ability to tune out noise and keep communication channels clear.
- Practice focused attention: Meditation and mindfulness exercises may strengthen the brain's capacity to direct information flow efficiently.
- Stay mentally active: Challenging cognitive tasks can support the brain's natural tuning mechanisms.
Source: Neuroscience News
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