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Deconstruction of a neural circuit for working memory: hubs, coding mechanisms, and signal routing

Objective

Working memory is the basis of cognition. It allows behaviour to be governed by internal goals rather than by reflexive stimulus-response mappings. The neural mechanisms of memory maintenance are heavily contested. Animal electrophysiology studies suggest a pivotal role of persistent spiking activity in single neurons of the prefrontal cortex, whereas human neuroimaging points to sub-threshold synaptic activity distributed across sensory cortex. This double dissociation of storage mechanisms and storage sites could result from the comparison of different recording methods, which measure distinct neuronal signals. Alternatively, there might be a fundamental difference between humans and animals. My key objective is to formulate general principles of working memory coding at the cellular and circuit level by integrating across previously disconnected lines of research. I will address two central questions. First, where and how is the memorized information stored? I will use an innovative approach to record large-scale single-unit activity from a cognitive (prefrontal) and a sensory (auditory) region in awake neurosurgical patients and directly compare the data to recordings from mice performing the same auditory working memory task. This will allow me to determine whether the mnemonic fingerprints are species-specific or shared across humans and rodents. Second, what neural pathways support the flow of information during working memory? Using the animal model, I will disrupt cross-regional interactions in the memory network with millisecond-precise, projection-specific optogenetic tools in order to dissect the contribution of each hub to memory storage and memory access. This project provides an unprecedented one-to-one matching of behavioural tasks and recording methods with single-cell and split-second resolution in humans and rodents. It represents a major step forward in understanding the cellular and circuit basis of a critical cognitive brain function.

Keywords

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Programme(s)

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Topic(s)

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Funding Scheme

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ERC-STG - Starting Grant

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Call for proposal

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(opens in new window) ERC-2017-STG

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Host institution

KLINIKUM DER TECHNISCHEN UNIVERSITÄT MÜNCHEN (TUM KLINIKUM)
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 1 499 989,00
Address
ISMANINGER STRASSE 22
81675 MUENCHEN
Germany

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Region
Bayern Oberbayern München, Kreisfreie Stadt
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 1 499 989,00

Beneficiaries (1)

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