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Bifurcation control of gait transition in insect locomotion

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This bifurcation generates mechanisms that control burst duration and interburst interval in endogenous bursting and the duration of pulse-triggered bursts in endogenously silent neurons... The burst duration grows linear with the number of spikes per burst in retractor interneurons... The burst duration of the retractor interneuron determined the period of the network... The retractor burst duration determined what type of gait was exhibited by network activity... As such, we were able to control the smooth transition from metachronal wave to tripod gait... While the duty cycle of retractor interneurons was greater than 50%, we observed a gait comprised of metachronal progression of bursts from posterior to anterior... When the duty cycle became 50%, we observed the tripod gait, where the activity in the prothoracic and metathoracic protractor interneurons was synchronous... In conclusion, we constructed a locomotor CPG model using a mechanism generated by the cornerstone bifurcation... This mechanism controls the duration of pulse-triggered bursts in endogenously silent neurons and governs a smooth transition from a metachronal gait to a tripod gait.

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The dependence of the CPG temporal characteristics on the retractor θK2 describes the transition from metachronal wave to tripod gait.
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Figure 1: The dependence of the CPG temporal characteristics on the retractor θK2 describes the transition from metachronal wave to tripod gait.

Mentions: In the model, each leg was controlled by one oscillator consisting of two mutually inhibitory interneurons: protraction and retraction interneurons. The model central pattern generator (CPG) contains three coupled oscillators: PP-PR, MsP-MsR, MtP-MtR labeling protractor and retractor interneurons each for the prothoracic, mesothoracic, and metathoracic segments, respectively. The bifurcation-generated mechanisms make quantitative predictions on the CPG activity. The duration of the burst was governed by the inverse-square-root law (Figure 1). The burst duration grows linear with the number of spikes per burst in retractor interneurons.


Bifurcation control of gait transition in insect locomotion
The dependence of the CPG temporal characteristics on the retractor θK2 describes the transition from metachronal wave to tripod gait.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4126363&req=5

Figure 1: The dependence of the CPG temporal characteristics on the retractor θK2 describes the transition from metachronal wave to tripod gait.
Mentions: In the model, each leg was controlled by one oscillator consisting of two mutually inhibitory interneurons: protraction and retraction interneurons. The model central pattern generator (CPG) contains three coupled oscillators: PP-PR, MsP-MsR, MtP-MtR labeling protractor and retractor interneurons each for the prothoracic, mesothoracic, and metathoracic segments, respectively. The bifurcation-generated mechanisms make quantitative predictions on the CPG activity. The duration of the burst was governed by the inverse-square-root law (Figure 1). The burst duration grows linear with the number of spikes per burst in retractor interneurons.

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

This bifurcation generates mechanisms that control burst duration and interburst interval in endogenous bursting and the duration of pulse-triggered bursts in endogenously silent neurons... The burst duration grows linear with the number of spikes per burst in retractor interneurons... The burst duration of the retractor interneuron determined the period of the network... The retractor burst duration determined what type of gait was exhibited by network activity... As such, we were able to control the smooth transition from metachronal wave to tripod gait... While the duty cycle of retractor interneurons was greater than 50%, we observed a gait comprised of metachronal progression of bursts from posterior to anterior... When the duty cycle became 50%, we observed the tripod gait, where the activity in the prothoracic and metathoracic protractor interneurons was synchronous... In conclusion, we constructed a locomotor CPG model using a mechanism generated by the cornerstone bifurcation... This mechanism controls the duration of pulse-triggered bursts in endogenously silent neurons and governs a smooth transition from a metachronal gait to a tripod gait.

No MeSH data available.


Related in: MedlinePlus