Theta-Phase Targeted Encoding Gates Memory Sensitivity

Theta phase at encoding predicted subsequent memory sensitivity in an associative memory task, while retrieval phase and encoding–retrieval phase matching showed no measurable effect.

• Why it matters: Competing theories propose theta phase either gates encoding/retrieval or becomes encoded and reinstated during retrieval; this work tests which account better fits behavior.
• What they did: Using a closed-loop EEG system, visual targets were presented at predefined mid-frontal theta phases during encoding and again during retrieval at either the same or an alternative phase.
• The result: Encoding-phase effects were linked to later memory sensitivity, but retrieval-phase timing and phase matching did not influence performance, supporting a gating role for theta state during encoding.

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