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Plos Biology : Precise Temperature Compensation of Phase in a Rhythmic Motor Pattern, Volume 8

By Harris, William A.

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Book Id: WPLBN0003940939
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos Biology : Precise Temperature Compensation of Phase in a Rhythmic Motor Pattern, Volume 8  
Author: Harris, William A.
Volume: Volume 8
Language: English
Subject: Journals, Science, Biology
Collections: Periodicals: Journal and Magazine Collection (Contemporary), PLoS Biology
Historic
Publication Date:
Publisher: Plos

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Harris, W. A. (n.d.). Plos Biology : Precise Temperature Compensation of Phase in a Rhythmic Motor Pattern, Volume 8. Retrieved from http://netlibrary.net/


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Description : Most animal species are cold-blooded, and their neuronal circuits must maintain function despite environmental temperature fluctuations. The central pattern generating circuits that produce rhythmic motor patterns depend on the orderly activation of circuit neurons. We describe the effects of temperature on the pyloric rhythm of the stomatogastric ganglion of the crab, Cancer borealis. The pyloric rhythm is a triphasic motor pattern in which the Pyloric Dilator (PD), Lateral Pyloric (LP), and Pyloric (PY) neurons fire in a repeating sequence. While the frequency of the pyloric rhythm increased about 4-fold (Q10,2.3) as the temperature was shifted from 7uC to 23uC, the phase relationships of the PD, LP, and PY neurons showed almost perfect temperature compensation. The Q10’s of the input conductance, synaptic currents, transient outward current (IA), and the hyperpolarization-activated inward current (Ih), all of which help determine the phase of LP neuron activity, ranged from 1.8 to 4. We studied the effects of temperature in .1,000 computational models (with different sets of maximal conductances) of a bursting neuron and the LP neuron. Many bursting models failed to monotonically increase in frequency as temperature increased. Temperature compensation of LP neuron phase was facilitated when model neurons’ currents had Q10’s close to 2. Together, these data indicate that although diverse sets of maximal conductances may be found in identified neurons across animals, there may be strong evolutionary pressure to restrict the Q10’s of the processes that contribute to temperature compensation of neuronal circuits.

 

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