Journal
CEREBRAL CORTEX
Volume 27, Issue 9, Pages 4423-4435Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhw244
Keywords
dopamine; dopamine D2 receptor; macaque monkey; prefrontal cortex; working memory
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Funding
- German Research Foundation (DFG) [NI 618/5-1]
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Working memory is associated with persistent activity in the prefrontal cortex (PFC). The neuromodulator dopamine, which is released by midbrain neurons projecting into the frontal lobe, influences PFC neurons and networks via the dopamine D1 (D1R) and the D2 receptor (D2R) families. Although behavioral, clinical and computational evidence suggest an involvement of D2Rs in working memory, a neuronal explanation is missing. We report an enhancement of persistent working memory responses of PFC neurons after iontophoretically stimulating D2Rs in monkeys memorizing the number of items in a display. D2R activation improved working memory representation at the population level and increased population dynamics during the transition from visual to mnemonic representations. Computational modeling suggests that D2Rs act by modulating interneuron-to-pyramidal signaling. By increasing the population's response dynamics, D2Rs might put PFC networks in a more flexible state and enhance the neurons' working memory coding, thereby controlling dynamic cognitive control.
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