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Phase maintenance in a rhythmic motor pattern during temperature changes in vivo.

Wafa Soofi¹, Marie L Goeritz², Tilman J Kispersky²

¹Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia;

Journal of Neurophysiology

|March 28, 2014

Summary

This summary is machine-generated.

Crab pyloric rhythm phases remain stable across temperatures. However, the rhythm

Keywords:

central pattern generator pyloric rhythm robustness stomatogastric ganglion

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Area of Science:

Neuroscience
Animal Physiology
Crustacean Biology

Background:

Central pattern generating neural circuits ensure reliable function throughout life.
Temperature fluctuations challenge poikilotherm nervous systems due to temperature-dependent dynamics.
The crustacean stomatogastric nervous system's pyloric circuit generates a triphasic rhythm.

Purpose of the Study:

To investigate the temperature dependence of pyloric rhythm frequency and phase relationships in intact crabs.
To compare in vivo temperature effects with in vitro findings in the stomatogastric nervous system.

Main Methods:

Extracellular electrodes were implanted in Cancer borealis and Cancer pagurus.
Tank water temperature was shifted from 11°C to 26°C to measure in vivo pyloric frequency and phases.
A subset of experiments involved in vitro analysis of the stomatogastric ganglion under similar temperature ramps.

Main Results:

Pyloric frequency in intact crabs significantly increased with temperature (Q10 = 2-2.5).
Pyloric phase relationships were generally conserved across the tested temperature range in vivo.
Maximal in vivo frequency at high temperatures was lower than observed in vitro.

Conclusions:

The pyloric rhythm's phase relationships are generally preserved in vivo across a wide temperature range.
The frequency range of the pyloric rhythm in vivo is more restricted compared to in vitro conditions.
Sensory feedback and neuromodulatory environments may influence temperature compensation mechanisms in neural circuits.