Chapter 12--modulation of rhythmic movement: control of coordination

Area of Science:

• Neuroscience
• Motor Control
• Rhythmic Movements

Background:

• Rhythmic movements like breathing, walking, and chewing involve complex neural coordination.
• Traditional models focus on core excitatory networks, but coordination requires understanding network component interactions.

Purpose of the Study:

• To investigate the role of neuromodulators, particularly 5-hydroxytryptamine (5-HT), in coordinating breathing, walking, and chewing.
• To explore the common principles governing neural network interactions for meaningful movement production.

Main Methods:

• Review of existing evidence on 5-HT's role in coordinating CPGs (Central Pattern Generators).
• Analysis of data from novel mouse models investigating inhibitory coordinating neurons.
• Focus on the impact of 5-HT on inhibitory interneurons essential for coordination.

Main Results:

• Evidence suggests 5-HT input to CPGs selects inhibitory interneurons for breathing and walking coordination.
• New mouse models reveal glycinergic pacemaker neurons contributing to respiratory rhythm.
• These findings extend beyond basic rhythm production to coordinated movement.

Conclusions:

• Neuromodulators like 5-HT play a critical role in coordinating complex rhythmic movements.
• Inhibitory interneurons and specific neuronal populations (e.g., glycinergic pacemaker neurons) are key to motor coordination.
• Further research is needed to fully elucidate the mechanisms for walking and chewing coordination.