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Calcium Responses Model in Striatum Dependent on Timed Input Sources

  • Takashi Nakano
  • Junichiro Yoshimoto
  • Jeff Wickens
  • Kenji Doya
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5768)

Abstract

The striatum is the input nucleus of the basal ganglia and is thought to be involved in reinforcement learning. The striatum receives glutamate input from the cortex, which carries sensory information, and dopamine input from the substantia nigra, which carries reward information. Dopamine-dependent plasticity of cortico-striatal synapses is supposed to play a critical role in reinforcement learning. Recently, a number of labs reported contradictory results of its dependence on the timing of cortical inputs and spike output. To clarify the mechanisms behind spike timing-dependent plasticity of striatal synapses, we investigated spike timing-dependence of intracellular calcium concentration by constructing a striatal neuron model with realistic morphology. Our simulation predicted that the calcium transient will be maximal when cortical spike input and dopamine input precede the postsynaptic spike. The gain of the calcium transient is enhanced during the “up-state” of striatal cells and depends critically on NMDA receptor currents.

Keywords

Calcium Transient Calcium Response Medium Spiny Neuron Cortical Input Distal Dendrite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Takashi Nakano
    • 1
    • 2
  • Junichiro Yoshimoto
    • 1
    • 2
  • Jeff Wickens
    • 2
  • Kenji Doya
    • 1
    • 2
  1. 1.Graduate School of Information ScienceNara Institute of Science and TechnologyNaraJapan
  2. 2.Initial Research ProjectOkinawa Institute of Science and TechnologyOkinawaJapan

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