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Circuit Dynamics of Structuring Episodic Memories in Humans

Award Number: K99NS126233
ORGANIZATION: NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: TRAINING/TRAINEESHIP
PERIOD OF PERFORMANCE START DATE: 09/21/2022
PERIOD OF PERFORMANCE END DATE: 12/31/2023

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Circuit Dynamics of Structuring Episodic Memories in Humans - Project summary Our lives unfold over time, weaving rich, dynamic, and multisensory information into a continuous experience. However, we remember this as a series of discrete events. For example, the memory of a two-hour movie consists of a few memorable moments tied to the main story. During encoding, we segment deviant events and associate relevant events. During retrieval, we utilize the temporal association among encoded events to search for specific memory information. The hippocampus (HPC), prefrontal cortex (PFC) and substantia nigra (SN) are thought to support cognitive computations (i.e., conceptual prediction, prediction error detection, temporal association) that are critical for the encoding and retrieval of episodic memory. However, how these three regions work together to facilitate the construction of episodic memory in humans remains unclear. The proposed study aims to address this by identifying neural dynamics in the HPC-PFC-SN network and revealing circuit-level neural mechanisms of event segmentation and its relationship with human episodic memory. The central hypothesis is that event segmentation, which is influential in episodic memory formation and retrieval, emerges from the difference between the HPC perceptual predictions and received sensory inputs, which is tracked by dopaminergic neurons in the SN to update event models stored in the PFC. To test this, I will record both single neuron activity and local field potential signals in the HPC-PFC-SN network while patients, who have depth electrodes implanted for clinical purposes, encode, and retrieve the memory of semi-realistic experience created by well-controlled video clips. I will also build a computational model that can rigorously reproduce the observed behavioral and neural signatures. The trained model will be used as a proxy of the HPC-PFC-SN network to study the causal link between this tripartite network and memory behaviors by simulating computational “lesions”, which will provide insightful guidance for real electrical stimulation. To achieve the proposed goals, I will pursue training mentored by a group of experts in different fields, including the intraoperative recordings (Dr. Ziv Williams and Dr. Adam Mamelak), analyses of inter-regional neural dynamics and electrical stimulation (Dr. Ueli Rutishauser), and computational modeling (Dr. Gabriel Kreiman). The comprehensive analytic approaches spinning from behavior measurements, invasive neural recordings from both microscopic and mesoscopic levels, computational modeling and electrical stimulation will provide valuable opportunities to strengthen our understanding of human episodic memory system. The expected outcomes of this proposal will potentially advance the development of therapeutic interventions for memory-related disorders.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2024 ( Subtotal = -$6,874 )
2024	2023	CHILDREN'S HOSPITAL CORPORATION, THE	300 LONGWOOD AVE	BOSTON	MA	02115	SUFFOLK	USA	Extramural Research Programs in the Neurosciences and Neurological Disorders	000	2	12/5/2023	NON-COMPETING CONTINUATION	$0
2024	2023	CHILDREN'S HOSPITAL CORPORATION, THE	300 LONGWOOD AVE	BOSTON	MA	02115	SUFFOLK	USA	Extramural Research Programs in the Neurosciences and Neurological Disorders	001	2	9/9/2024	NON-COMPETING CONTINUATION	-$6,874
														Subtotal = -$6,874

Issue Date FY: 2023 ( Subtotal = $115,635 )
2023	2023	CHILDREN'S HOSPITAL CORPORATION, THE	300 LONGWOOD AVE	BOSTON	MA	02115	SUFFOLK	USA	Extramural Research Programs in the Neurosciences and Neurological Disorders	000	2	9/13/2023	NON-COMPETING CONTINUATION	$115,635
														Subtotal = $115,635

Issue Date FY: 2022 ( Subtotal = $118,875 )
2022	2022	CHILDREN'S HOSPITAL CORPORATION, THE	300 LONGWOOD AVE	BOSTON	MA	02115	SUFFOLK	USA	Extramural Research Programs in the Neurosciences and Neurological Disorders	000	1	9/21/2022	NEW	$118,875
														Subtotal = $118,875

Grand Total All Awards = $227,636

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Circuit Dynamics of Structuring Episodic Memories in Humans

Award Number: K99NS126233

ORGANIZATION: NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: TRAINING/TRAINEESHIP

PERIOD OF PERFORMANCE START DATE: 09/21/2022

PERIOD OF PERFORMANCE END DATE: 12/31/2023

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