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Persistent activity during working memory maintenance predicts long-term memory formation in the human hippocampus
Jonathan Daume1,2,3, Jan Kamiński4, Yousef Salimpour5
1Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA.
Biorxiv : the Preprint Server for Biology
|July 29, 2024
Summary
This study reveals that hippocampal persistent activity supports both working memory maintenance and long-term memory encoding, suggesting a shared neural basis for these cognitive systems.
Area of Science:
- Cognitive Neuroscience
- Neurobiology
- Human Memory Systems
Background:
- Working Memory (WM) and Long-Term Memory (LTM) are traditionally considered distinct cognitive systems.
- The interaction between WM and LTM during memory formation remains poorly understood.
Purpose of the Study:
- To investigate the neural mechanisms underlying the interaction between WM and LTM.
- To determine if single neurons in the human medial temporal lobe contribute to both WM maintenance and LTM encoding.
Main Methods:
- Single-neuron recordings were performed in the human medial temporal lobe (hippocampus and amygdala).
- Neural activity was recorded during WM maintenance of novel items and subsequent LTM recognition memory tests.
- Analysis focused on content-selective persistent activity and visually evoked activity during WM and LTM retrieval.
Main Results:
- Hippocampal persistent activity during WM maintenance predicted subsequent LTM recognition confidence.
- Visually evoked activity in the same cells did not predict LTM formation.
- Memory-selective neurons showed stronger responses to familiar stimuli with higher prior WM persistent activity during LTM retrieval.
Conclusions:
- Hippocampal persistent activity serves a dual role in both WM maintenance and LTM encoding.
- This finding reveals a common single-neuron mechanism shared by WM and LTM systems.
- The study bridges the gap between WM and LTM by identifying a shared neural substrate.
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