Three scientists at MIT’s Picower Institute for Learning and Memory have published a new theory in The Journal of Neuroscience that attributes cognition and consciousness to traveling rhythmic brain waves that coordinate neural networks via analog computation.
The classic “circuit” metaphor accounts for synaptic storage of memories and goals, but it cannot explain the millisecond‑scale processing required in ever‑changing sensory contexts. Brain waves—synchronized rhythmic fluctuations of large neuronal populations—serve as a rapid control system that can mobilize millions of neurons in a fraction of a second.
Unlike digital circuits that compute step‑by‑step through sequential gates, analog computation exploits wave interference to perform many calculations in parallel. The authors note that locally traveling waves are ubiquitous in the brain, indicating that the brain harnesses its own physics.
Neurons often exhibit “mixed selectivity,” participating in multiple functional networks simultaneously. Different frequency bands orchestrate distinct computational layers: slower α/β waves encode memories and goals, while faster γ waves represent incoming sensory data. α/β waves arise from coordinated spiking in synaptic circuits, and once generated they can rapidly influence other spikes via ephaptic (electric‑field) coupling.
α/β waves also act spatially and temporally, traveling across the cortex like mobile stencils that dictate where and when γ waves can process information and which neuronal ensembles are recruited. The authors term this “spatiotemporal computing,” where intersecting waves add and subtract, enabling analog operations.
Regarding consciousness, the paper argues that it emerges when dynamic wave patterns bring the cortex into a globally integrated state. Anesthesia studies by Miller and colleague Emery Brown show that three pharmacologically distinct agents all disrupt large‑scale wave organization, leading to loss of consciousness—suggesting that consciousness depends more on wave integrity than on specific receptors or cell types.
Beyond a unified explanation of cognition and consciousness, the theory highlights the therapeutic promise of non‑invasive wave manipulation. The team plans to seek signatures of analog computation in brain‑wave recordings to test the hypothesis.
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