Network oscillatory activity driven by context memory processing is differently regulated by glutamatergic and...

Area of Science:

• Neuroscience
• Cognitive Science
• Psychiatry

Background:

• Memory retrieval relies on coordinated brain network activity.
• Network dysfunction and memory impairment are common in psychiatric disorders.
• Neural correlates of memory retrieval and failure at the oscillatory activity level are poorly understood.

Purpose of the Study:

• To investigate how local and regional oscillatory activity represents memory retrieval and failure.
• To examine the effects of amnestic agents on neural oscillations during memory processes.

Main Methods:

• Local field potentials (LFPs) were recorded from mouse retrosplenial cortex (RSC), dorsal hippocampus (DH), and anterior cingulate cortex (ACC).
• Mice underwent context exploration, contextual fear conditioning memory retrieval, and administration of MK-801 or scopolamine (SCOP).
• Analysis focused on changes in intra-regional power and inter-regional peak coherence across frequency bands.

Main Results:

• Context encoding and memory retrieval showed decreased delta power and increased theta coherence across RSC, DH, and ACC.
• MK-801 and scopolamine differentially affected gamma oscillations.
• Both drugs impaired memory retrieval, but only MK-801 treatment correlated with disrupted oscillatory power and coherence.

Conclusions:

• Neural signatures for memory impairment were identified, linked to specific oscillatory disruptions.
• These findings highlight potential therapeutic targets for memory-related psychiatric disorders.