Spatially organized striatal neuromodulator release encodes trajectory errors.

Area of Science:

• Neuroscience
• Computational Neuroscience
• Animal Behavior

Background:

• Goal-directed navigation relies on evaluating movement relative to landmarks.
• Striatal dopamine and acetylcholine are key modulators of goal-directed behavior.
• The role of neuromodulator dynamics at landmarks in incorporating relative motion remains unclear.

Purpose of the Study:

• To investigate how neuromodulator dynamics in the striatum encode relative motion during navigation.
• To determine the specific roles of dopamine and acetylcholine in processing trajectory errors at landmarks.
• To elucidate the neural mechanisms underlying goal-directed navigation and learning.

Main Methods:

• Optical measurements and micro-fiber array recordings in mice.
• Dynamic regression modeling to analyze neural signals.
• Reinforcement learning models to simulate neural processes.

Main Results:

• Cue-evoked striatal dopamine release encodes bi-directional trajectory errors based on locomotion speed, direction, and visual flow.
• Anatomical gradients of trajectory error signaling exist across the striatum.
• Dopamine and acetylcholine exhibit distinct temporal dynamics and spatial distributions in encoding trajectory errors, suggesting specialized roles in learning and behavior modulation.

Conclusions:

• Striatal dopamine and acetylcholine signals encode trajectory errors, providing crucial information for guiding locomotion speed and direction.
• Region-specific neuromodulator dynamics in the striatum contribute to learning and behavioral adaptation during navigation.
• The findings suggest a neural substrate for trajectory error generation in goal-directed navigation.