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Low-threshold spiking interneurons (LTSIs) in the dorsomedial striatum (DMS) are crucial for learning new reward associations. Their activity must decrease for acquiring novel goals but remain stable for modifying existing ones.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Cellular Neuroscience

Background:

  • The dorsomedial striatum (DMS) plays a key role in motor control and reward processing.
  • The precise neural circuits governing DMS function are not fully understood.
  • Low-threshold spiking interneurons (LTSIs) have extensive local connectivity but their in vivo function is largely unexplored.

Purpose of the Study:

  • To investigate the in vivo function of LTSIs in the DMS during goal-directed behaviors.
  • To determine the role of LTSI activity modulation in learning and reward processing.

Main Methods:

  • Fiber photometry was used to measure LTSI calcium activity in vivo across various DMS-mediated behaviors.
  • Two distinct manipulation methods were employed to alter LTSI activity.
  • Fast-spiking interneurons were manipulated for comparison.

Main Results:

  • LTSI activity showed specific reward-related patterns, decreasing during goal-directed learning.
  • Down-modulation of LTSI activity was essential for acquiring new reward contingencies.
  • Sustained LTSI activation impaired instrumental learning.
  • Manipulations of fast-spiking interneurons did not yield similar effects, highlighting LTSI specificity.
  • The GABAergic function of LTSIs was found to be critical for learning.

Conclusions:

  • LTSI activity modulation is critical for the acquisition of novel goal-directed behaviors.
  • LTSIs act as key regulators, or gatekeepers, of goal-directed learning in the DMS.
  • This study elucidates a specific role for LTSIs in instrumental learning and reward processing.