Evolutionarily conserved coding properties of auditory neurons across grasshopper species
Proceedings of the Royal Society B: Biological Sciences, ISSN: 1471-2970, Vol: 275, Issue: 1646, Page: 1965-1974
2008
- 32Citations
- 42Captures
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Metrics Details
- Citations32
- Citation Indexes32
- 32
- CrossRef27
- Captures42
- Readers42
- 42
Article Description
We investigated encoding properties of identified auditory interneurons in two not closely related grasshopper species (Acrididae). The neurons can be homologized on the basis of their similar morphologies and physiologies. As test stimuli, we used the species-specific stridulation signals of Chorthippus biguttulus, which evidently are not relevant for the other species, Locusta migratoria. We recorded spike trains produced in response to these signals from several neuron types at the first levels of the auditory pathway in both species. Using a spike train metric to quantify differences between neuronal responses, we found a high similarity in the responses of homologous neurons: interspecific differences between the responses of homologous neurons in the two species were not significantly larger than intraspecific differences (between several specimens of a neuron in one species). These results suggest that the elements of the thoracic auditory pathway have been strongly conserved during the evolutionary divergence of these species. According to the 'efficient coding' hypothesis, an adaptation of the thoracic auditory pathway to the specific needs of acoustic communication could be expected. We conclude that there must have been stabilizing selective forces at work that conserved coding characteristics and prevented such an adaptation. © 2008 The Royal Society.
Bibliographic Details
The Royal Society
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