Dynamic imbalances in cell-type specific striatal ensemble activity during visually guided locomotion.

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Motor Control

Background:

• Locomotion is crucial for survival and is guided by an animal's environmental position relative to goals.
• Striatal output neurons, specifically direct pathway (dSPN) and indirect pathway (iSPN) neurons, are known to influence locomotion.
• However, the natural coordination of dSPN and iSPN activity by changing environments remains poorly understood.

Purpose of the Study:

• To investigate how the activity of dSPNs and iSPNs is dynamically coordinated by environmental context during locomotion.
• To understand the role of these neural ensembles in visually-guided reward-seeking behavior.

Main Methods:

• Experiments were conducted using head-fixed mice navigating a visually-guided locomotor trajectory.
• The relative activity balance between dSPNs and iSPNs was monitored in relation to the animal's position.
• Analysis focused on position-tuned neuronal ensembles and their sensitivity to the visual environment.

Main Results:

• The balance of dSPN and iSPN activity was found to be dynamically modulated based on the animal's position within the locomotor trajectory.
• Significant imbalances were observed within ensembles of striatal projection neurons (SPNs) that were tuned to specific positions.
• These position-tuned SPN ensembles demonstrated sensitivity to the visual cues within the environment.

Conclusions:

• Striatal output neuron activity is dynamically regulated by an animal's position and the associated sensory environment.
• Learned associations between sensory input and locomotion contribute to competitive imbalances in striatal output.
• These imbalances play a role in shaping context-dependent locomotion for goal-directed behaviors.