Neuromodulation of Rhythmic Motor Patterns in Neural Circuits

Rhythmic motor patterns are produced by specialised neural networks known as central pattern generators, which generate repetitive sequences of activity underlying functions such as locomotion, respiration and feeding. Neuromodulation refers to the processes by which chemical signals—ranging from biogenic amines and neuropeptides to activity-dependent ionic currents—alter the intrinsic properties of neurons or the strength of synaptic connections within these networks. By adjusting membrane conductances, synaptic efficacy and network excitability, neuromodulators enable circuits to maintain robust rhythmic outputs in the face of environmental perturbations, developmental changes and metabolic demands. The interplay between extrinsic modulatory inputs and intrinsic feedback mechanisms endows central pattern generators with both stability and flexibility, permitting smooth transitions between behavioural states, compensation for temperature or pH fluctuations, and adaptation to sensory inputs. Understanding how multiple modulatory pathways converge to sculpt motor rhythms offers insights into the principles of neuronal resilience, informs the design of bio-inspired robotic controllers and suggests novel strategies for interventions in movement disorders.

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Neuromodulation of Rhythmic Motor Patterns in Neural Circuits publication trend

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Technical terms

Neuromodulation: The alteration of neuronal or synaptic properties by chemicals that adjust network excitability and plasticity.

Central Pattern Generator (CPG): A neural circuit capable of producing rhythmic motor output without requiring phasic sensory input.

Intrinsic conductance: An ion channel-mediated current within a neuron that shapes its firing and oscillatory behaviour.

Extrinsic input: Modulatory signals originating outside a given circuit, often from higher centres or sensory pathways, that influence network dynamics.

Hyperpolarization-activated current (I_h): A mixed cation current active at hyperpolarised potentials that contributes to pacemaker activity and network rhythms.

References

1. Neuromodulation to the Rescue: Compensation of Temperature-Induced Breakdown of Rhythmic Motor Patterns via Extrinsic Neuromodulatory Input. PLOS Biology (2015).
2. Neuron populations use variable combinations of short-term feedback mechanisms to stabilize firing rate. PLOS Biology (2023).
3. Na+/K+ pump interacts with the h-current to control bursting activity in central pattern generator neurons of leeches. eLife (2016).