Recording and Reproduction of Pattern Memory Trace in EEG by Direct Electrical Stimulation of Brain Cortex

TL;DR

This study shows that direct electrical stimulation of rat cortex can record and reproduce memory traces in EEG, revealing neural activation and relaxation phases associated with engram formation.

Contribution

It demonstrates a novel method for recording and reproducing memory traces in EEG through direct cortical electrical stimulation in rats.

Findings

Memory trace can be recorded and reproduced in EEG.

Memory-related neural activity involves phases of activation and relaxation.

DC potential shifts correlate with engram dynamics.

Abstract

This study demonstrates the capability of external signal recording into memory and the reproduction of memory trace of this pattern in EEG by direct AC electrical stimulation of rat cerebral cortex. Additionally, we examine shifts of the DC potential level related to these phenomena. We show that in the course of memory trace reproduction, consecutive phases of engram activation and relaxation are registered and accompanied by corresponding negative and positive DC shifts. The observed electrophysiological changes may reflect consecutive activation and inhibition phases of neural ensembles participating in engram formation.