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- W4386436023 abstract "SUMMARY Dopamine significantly modulates working memory (WM) 1–8 , a fundamental cognitive function that maintains information during a brief delay period 9–11 . The temporal precision of dopaminergic modulation in WM and related neural mechanisms remain elusive. Here we unveiled the pivotal role of dopamine timing in WM performance with head-fixed mice engaged in learning an olfactory WM task. Through electrophysiology and optogenetics, we found that dopaminergic neurons in the ventral tegmental area (VTA) could encode WM information during the delay period, and manipulating dopaminergic neuronal activity bidirectionally modulated WM performance in an inverted U-shaped manner. Optogenetic manipulation of VTA activity also induced bidirectional changes in WM-related neural activity in the medial prefrontal cortex (mPFC). Imaging with a dopamine-sensitive GPCR-activation-based sensor (GRAB DA ) 12,13 revealed transient dopamine peaks in the mPFC specifically during the early-delay period. Optogenetic stimulation of VTA-to-mPFC dopaminergic projections during the early- and late-delay period enhanced and impaired WM performance, respectively. Manipulations outside these periods or involving the nucleus accumbens had no effect. Single-unit recordings demonstrated that optogenetic excitation of VTA-to-mPFC projections could modulate mPFC neuronal activity in a manner consistent with behavioral modulation. Thus, the timing of dopamine release is critical in modulation of neuronal activity and behavior." @default.
- W4386436023 created "2023-09-05" @default.
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- W4386436023 date "2023-09-03" @default.
- W4386436023 modified "2023-09-27" @default.
- W4386436023 title "Timing-dependent modulation of working memory by VTA dopamine release in medial prefrontal cortex" @default.
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- W4386436023 doi "https://doi.org/10.1101/2023.09.01.555676" @default.
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