Electrophysiological Dynamics of Default Network Suppression

In six patients performing a target detection task, default network suppression emerged later than salience/action responses, with late sustained decreases in hippocampal activity and high-frequency broadband power.

• Why it matters: Network competition between internally directed cognition and externally oriented action is central to information processing, but its high-resolution timing across cortex and subcortex is unclear.
• What they did: The study combined within-individual precision functional neuroimaging with intracranial electrophysiology to track network-assigned responses, including single-neuron firing rates and high-frequency broadband activity.
• The result: Salience detection and action planning showed early transient peaks near the participant response, while default network suppression occurred later, including sustained hippocampal suppression along its long axis.

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