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Rule encoding in dorsal striatum impacts action selection.

Gregory B Bissonette1,2, Matthew R Roesch1,2

  • 1Department of Psychology, University of Maryland, College Park, MD, 20742, USA.

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|August 15, 2015
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Summary

The medial dorsal striatum (mDS) is crucial for cognitive flexibility, aiding in rule integration. Inactivating the mDS impairs shifting between rules, highlighting its role in flexible decision-making.

Keywords:
attentional set-shiftingcognitive flexibilitymedial dorsal striatumratsingle unit

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • Cognitive flexibility is a key prefrontal cortex (PFC) function, but downstream neural mechanisms are unclear.
  • The medial dorsal striatum (mDS) receives PFC projections and integrates response and rule information.

Purpose of the Study:

  • To investigate the role of the mDS in cognitive flexibility using a novel rat rule-shifting task.
  • To identify neural correlates of rule-switching within the mDS.

Main Methods:

  • A novel, temporally precise rule-shifting task in rats.
  • Single-unit recordings in the mDS during rule-switching.
  • Pharmacological inactivation of the mDS using a baclofen/muscimol cocktail.

Main Results:

  • mDS inactivation significantly impaired rule-shifting ability and increased regressive errors.
  • Neurons modulated by direction reflected competing rule information, with conflict resolving as performance improved.
  • A distinct population of rule-modulated neurons became selective prior to accurate behavioral rule reflection.

Conclusions:

  • The mDS is a critical neural substrate for cognitive flexibility and abstract cognition.
  • mDS neural activity dynamics reflect the resolution of competing rule information during behavioral shifts.
  • These findings implicate the mDS in mediating flexible cognition relevant to psychiatric disorders.