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Neuronal encoding of recognition memory for numerical quantities in macaque intraparietal and prefrontal cortices
Tobias Machts1, Julia Grüb1, Andreas Nieder1
1Animal Physiology, Institute of Neurobiology, University of Tuebingen, Auf der Morgenstelle 28, Tuebingen 72076, Germany.
Progress in Neurobiology
|June 15, 2025
Summary
The primate prefrontal cortex (PFC) stores abstract number information, unlike the ventral intraparietal cortex (VIP) which shows transient numerical coding. The PFC enhances recognition of target numbers, crucial for memory.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Primate Cognition
Background:
- The parieto-frontal network is crucial for numerical processing in primates.
- Understanding how abstract numerical categories are retained for recognition memory is unclear.
Purpose of the Study:
- To investigate how neurons in the ventral intraparietal cortex (VIP) and lateral prefrontal cortex (PFC) retain abstract numerical categories.
- To differentiate the roles of VIP and PFC in processing target versus irrelevant numerosities during recognition tasks.
Main Methods:
- Single-neuron recordings were performed in the VIP and PFC of two male macaques.
- Monkeys were trained to memorize and recognize target numerosities amidst irrelevant numerical sequences.
Main Results:
- VIP neurons showed rapid decline in selectivity for both target and irrelevant numerosities.
- PFC neurons maintained selective tuning for target numerosities, enabling discrimination.
- Match enhancement was observed in PFC, while match suppression occurred in both VIP and PFC.
Conclusions:
- The VIP primarily encodes currently displayed numerosities with transient selectivity.
- The PFC specializes in processing and storing numerical quantities for recognition memory, utilizing match enhancement.
- These findings highlight the PFC's critical role in numerical recognition memory.
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