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In vivo Calcium Imaging of Mouse Geniculate Ganglion Neuron Responses to Taste Stimuli
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Bursting by taste-responsive cells in the rodent brain stem
John-Paul Baird1, Michael G Tordoff2, Stuart A McCaughey3
1Department of Psychology and Neuroscience, Amherst College, Amherst, Massachusetts;
Journal of Neurophysiology
|January 23, 2015
Summary
Brain stem gustatory neurons, particularly in the nucleus of the solitary tract (NST), exhibit bursting activity. This bursting firing pattern influences taste responses and may enhance stimulus contrast.
Area of Science:
- Neuroscience
- Gustatory System Research
- Sensory Processing
Background:
- Neuronal bursting is well-documented in visual systems but understudied in taste pathways.
- The role of bursting in gustatory neuron function remains largely unknown.
Purpose of the Study:
- Investigate bursting activity in brain stem gustatory neurons.
- Determine if bursting neurons possess distinct characteristics compared to non-bursting neurons.
- Explore the functional implications of bursting in taste processing.
Main Methods:
- Electrophysiological recordings from neurons in the nucleus of the solitary tract (NST) and parabrachial nucleus (PBN) of mice and rats.
- Analysis of spontaneous firing patterns, focusing on short-interval firing characteristic of bursting.
- Correlation of bursting prevalence with responses to various taste compounds (NaCl, sucrose).
- Comparison of breadth-of-tuning measures using all spikes versus burst-only spikes.
Main Results:
- Many NST neurons exhibited bursting during spontaneous activity.
- Bursting NST neurons showed differential responsiveness to taste stimuli, correlating with NaCl in some mouse strains and rats, and sucrose in other mouse strains.
- Breadth-of-tuning was narrower for burst-only spikes in the NST of C57BL/6ByJ mice and rats.
- Limited evidence of spontaneous bursting was found in the rat PBN, with no relation to taste responses.
Conclusions:
- Bursting in NST gustatory neurons may amplify specific taste stimuli based on physiological needs.
- Bursting could sharpen neuronal tuning, enhancing the contrast between different taste qualities.
- The parabrachial nucleus (PBN) appears less involved in spontaneous bursting related to taste.
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