Seonglae ChoBasal ganglia do not directly “command” movement; rather, they form a system that selects which action to execute among multiple possibilities and suppresses unnecessary actions.
- Motor control: initiating, stopping, and regulating the intensity of movement
- Habit formation: the process by which repeated behaviors become automatic
- Reward learning: learning “was this action good?” via dopamine signals
- Action selection: involved in choosing one option among many
Examples of disorders:
- Parkinson’s disease: dopamine deficiency → difficulty initiating movement, tremor, rigidity
- Huntington’s disease: impaired inhibitory control → increased involuntary movements
- OCD / addiction: associated with dysfunction in habit and reward circuits
In short:
Basal ganglia = a circuit that “selects which action to run and helps automate it.”