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  • Biological substrates of reward and aversion: a nucleus accumbens activity hypothesis
  • Carlezon WA Jr; Thomas MJ
  • Neuropharmacology 2009[]; 56 Suppl 1 (): 122-32
  • The nucleus accumbens (NAc) is a critical element of the mesocorticolimbic system, a brain circuit implicated in reward and motivation. This basal forebrain structure receives dopamine (DA) input from the ventral tegmental area (VTA) and glutamate (GLU) input from regions including the prefrontal cortex (PFC), amygdala (AMG), and hippocampus (HIP). As such, it integrates inputs from limbic and cortical regions, linking motivation with action. The NAc has a well-established role in mediating the rewarding effects of drugs of abuse and natural rewards such as food and sexual behavior. However, accumulating pharmacological, molecular, and electrophysiological evidence has raised the possibility that it also plays an important (and sometimes underappreciated) role in mediating aversive states. Here we review evidence that rewarding and aversive states are encoded in the activity of NAc medium spiny GABAergic neurons, which account for the vast majority of the neurons in this region. While admittedly simple, this working hypothesis is testable using combinations of available and emerging technologies, including electrophysiology, genetic engineering, and functional brain imaging. A deeper understanding of the basic neurobiology of mood states will facilitate the development of well-tolerated medications that treat and prevent addiction and other conditions (e.g., mood disorders) associated with dysregulation of brain motivation systems.
  • |*Reward[MESH]
  • |Animals[MESH]
  • |Avoidance Learning/drug effects/*physiology[MESH]
  • |Nucleus Accumbens/drug effects/*physiology[MESH]
  • |Street Drugs/pharmacology[MESH]

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    *<b>[ Biological substrates of reward and aversion: a nucleus accumbens activity hypothesis ]</b> Neuropharmacology 2009; 56 Suppl 1() ; 122-32 Carlezon WA Jr; Thomas MJ


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    122 .56 Suppl 1 2009