Acting together: Cortex and striatum specify movement kinematics

Area of Science:

• Neuroscience
• Motor Control
• Systems Neuroscience

Background:

• Understanding the neural circuits underlying motor control is essential for treating movement disorders.
• The striatum's role in action selection and execution is well-established, but its specific contribution to movement kinematics remains less clear.

Purpose of the Study:

• To investigate the necessity of striatal activity for specifying movement kinematics.
• To elucidate the roles of the motor cortex and striatum in shaping flexible, goal-directed actions.

Main Methods:

• Development of a novel reach-to-pull behavioral task in mice.
• Simultaneous electrophysiological recordings from the motor cortex and striatum.
• In vivo manipulation of neural activity in these regions during task performance.

Main Results:

• Striatal activity was found to be necessary for the precise specification of movement kinematics, including speed and trajectory.
• The motor cortex and striatum exhibit coordinated activity patterns that predict movement parameters.
• Disrupting striatal function impaired the ability to generate appropriate movement kinematics for the task.

Conclusions:

• The striatum plays a critical role in specifying the detailed parameters of movement, not just in action selection.
• Motor cortex and striatal circuits interact to enable the flexible control of goal-directed movements.
• These findings offer new insights into the neural basis of motor learning and adaptation.