Brain Waves More Complex Than Thought, Study Finds
Original: Surprisingly complex waves reveal the brain's inner workings
Why This Matters
Reframes brain waves from passive byproduct to active real-time coordinator of cognition.
A April 2026 Nature Communications study led by Joshua Jacobs and Anup Das (University of Chicago) identified three distinct traveling wave patterns — source, sink, and spiral — across the cortex using intracranial electrodes. Different behavioral tasks correlated with distinct wave types, suggesting these waves actively reorganize neural activity in real time.
The human brain dedicates roughly half its energy to keeping neurons ready to fire. That electrical readiness produces waves of collective activity — long measured by electrodes and long dismissed as little more than background noise signaling the brain is 'on.' That view is shifting fast.
A study published in Nature Communications in April 2026 documented a richer catalog of wave types than previously recognized. Using intracranial electrode recordings, a team including Joshua Jacobs and Anup Das from the University of Chicago identified source waves (emanating outward from a single point), sink waves (converging inward), and vortex-like spiral waves. Crucially, different behavioral tasks were associated with distinct wave patterns — not just different intensities of the same basic oscillation.
The finding matters because neurons update their physical connections slowly, over days or months. Behavior, by contrast, must adapt in seconds. A growing faction of neuroscientists now argues that these large-scale traveling wave patterns serve as a fast-reconfiguration mechanism — effectively reorganizing cortical activity on the fly to match whatever cognitive task is at hand.
Earl K. Miller, a cognitive neuroscientist at MIT, framed the shift bluntly: the field has moved from asking whether traveling waves are relevant to treating them as 'a major motif of how the cortex processes information.'