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Corticostriatal plasticity: life after the depression
Severine Mahon1, Jean-Michel Deniau, Stephane Charpier
1Institut National de la Santé et de la Recherche Médicale U114, Chaire de Neuropharmacologie, Collège de France, 75231 Paris Cedex 05, France. stephane.charpier@college-de-france.fr
Trends in Neurosciences
|July 24, 2004
Summary
Reinforcement learning involves changes in brain connections. This study shows that strengthening connections (potentiation) in the corticostriatal pathway, not just weakening them, is key for motor learning.
Area of Science:
- Neuroscience
- Motor Learning
Background:
- The striatum plays a crucial role in reinforcement-based motor learning.
- Corticostriatal synapses are critical for this process.
- Long-term depression (LTD) was considered the primary form of plasticity.
Purpose of the Study:
- To investigate the role of synaptic potentiation at corticostriatal connections in motor learning.
- To explore how use-dependent potentiation contributes to sensorimotor integration.
Main Methods:
- Analysis of synaptic transmission efficacy at corticostriatal synapses.
- Investigation of postsynaptic intrinsic excitability changes.
- Modeling of synaptic plasticity's role in motor program selection.
Main Results:
- Evidence suggests use-dependent potentiation naturally occurs at corticostriatal synapses.
- This potentiation involves increases in both synaptic efficacy and intrinsic excitability.
- Potentiation decreases the cortical input needed to activate striatal output neurons.
Conclusions:
- Short-term and long-term potentiation at corticostriatal connections are vital for motor learning.
- These mechanisms contribute to forming sensorimotor links.
- Potentiation facilitates the engagement of motor programs based on cortical activity patterns.