Pascal Fries
Ernst Strüngmann Institute for Neuroscience, Frankfurt
Functionalist What matters is the organisation of the processing, not the material
Communication through coherence gives synchrony a job beyond binding. Pascal Fries’s argument is that gamma-band synchronization makes postsynaptic activation effective. A transmitting assembly drives a target only when its outputs arrive during the target’s depolarizing window, and attention shifts the phase relationships that decide who talks to whom. Information routes through the brain by relative phase, with no rewiring of anatomical connections. The 2015 Neuron review consolidates the mechanism with the electrophysiological evidence behind it.
The framework has an empirical pedigree. Fries’s group and collaborators showed gamma-band modulations in visual cortex tracking attentional selection, and the laminar story of deep-layer alpha and beta feedback against superficial-layer gamma feedforward carries the same phase logic into predictive processing. The routing account is one of the four mechanisms this site’s Consciousness Fingerprint page builds on, because routing by phase is a dynamical property that a different substrate could implement, if it implements the same relative timing.
For artificial systems, CTC states a concrete requirement. Any candidate conscious architecture must either generate internal oscillations with phase relationships or explain what replaces the routing function they perform. Whether transformer attention can play that role is one of the open questions the site tracks in the oscillatory binding debates.
Known for. Communication through coherence, gamma-band synchronization as a routing mechanism for neural information
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Pascal Fries is listed with the other functionalists and computationalists, who hold that what matters is the organisation of the processing, not the material. The theory family behind that position is set out in the index of consciousness theories. Every researcher covered on this site is indexed in the directory of consciousness researchers.