Paper Info
Title
An integrative theory of the phasic and tonic modes of dopamine modulation in the prefrontal cortex.
Abstract
This paper presents a model of both tonic and phasic dopamine (DA) effects on maintenance of working memory representations in the prefrontal cortex (PFC). The central hypothesis is that DA modulates the efficacy of inputs to prefrontal pyramidal neurons to prevent interferences for active maintenance. Phasic DA release, due to DA neurons discharges, acts at a short time-scale (a few seconds), while the tonic mode of DA release, independent of DA neurons firing, acts at a long time-scale (a few minutes). The overall effect of DA modulation is modeled as a threshold restricting incoming inputs arriving on PFC neurons. Phasic DA release temporary increases this threshold while tonic DA release progressively increases the basal level of this threshold. Thus, unlike the previous gating theory of phasic DA release, proposing that it facilitates incoming inputs at the time of their arrival, the effect of phasic DA release is supposed to restrict incoming inputs during a period of time after DA neuron discharges. The model links the cellular and behavioral levels during performance of a working memory task. It allows us to understand why a critical range of DA D1 receptors stimulation is required for optimal working memory performance and how D1 receptor agonists (respectively antagonists) increase perseverations (respectively distractability). Finally, the model leads to several testable predictions, including that the PFC regulates DA neurons firing rate to adapt to the delay of the task and that increase in tonic DA release may either improve or decrease performance, depending on the level of DA receptors stimulation at the beginning of the task.
Year
DOI
Venue
2002
10.1016/S0893-6080(02)00051-5
Neural Networks
Keywords
Field
DocType
dopamine modulation,prefrontal cortex,incoming input,da neurons firing rate,da d1 receptors stimulation,inverted u-curve,da neurons firing,d1 receptors,tonic mode,working memory,integrative theory,da modulation,phasic da release,da neurons discharge,da neuron discharge,dopamine,tonic da release,da receptors stimulation,d1 receptor
Neuroscience,Mathematical optimization,Gating,Tonic (music),Working memory,Prefrontal cortex,Dopamine,Neuromodulation,Neuron,Mathematics,Neurotransmitter
Journal
Volume
Issue
ISSN
15
4-6
0893-6080
Citations 
PageRank 
References 
6
1.36
7
Authors
2
Name
Order
Citations
PageRank
Jean-Claude Dreher1306.86
Yves Burnod210216.36