Striatal cell-type-specific encoding stability and reorganization for goal-directed behavior and habit

DMS D1+ neurons stably encode instrumental actions across goal-directed learning and remain linked to action-reward representational similarity even after control shifts to habit.

• Why it matters: Goal-directed behavior depends on action-outcome learning, but how specific striatal cell types preserve flexibility or reorganize during habit formation is unclear.
• What they did: The study longitudinally tracked and manipulated activity in DMS D1+ and D2/A2A+ neuron populations, testing how ensembles encode actions during learning and after behavioral control becomes habitual.
• The result: DMS D1+ activity supports adaptive, goal-directed decision making throughout, whereas DMS A2A+ ensembles show transient early action encoding and later habit-linked encoding, mediating learning processes but not persistent goal-directed control.

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