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Journal of Comparative Physiology A

, Volume 205, Issue 5, pp 717–733 | Cite as

Temporal processing properties of auditory DUM neurons in a bush-cricket

  • Andreas StumpnerEmail author
  • Paule Chloé Lefebvre
  • Marvin Seifert
  • Tim Daniel Ostrowski
Original Paper

Abstract

Insects with ears process sounds and respond to conspecific signals or predator cues. Axons of auditory sensory cells terminate in mechanosensory neuropils from which auditory interneurons project into (brain-) areas to prepare response behaviors. In the prothoracic ganglion of a bush-cricket, a cluster of local DUM (dorsal unpaired median) neurons has recently been described and constitutes a filter bank for carrier frequency. Here, we demonstrate that these neurons also constitute a filter bank for temporal patterns. The majority of DUM neurons showed pronounced phasic-tonic responses. The transitions from phasic to tonic activation had different time constants in different DUM neurons. Time constants of the membrane potential were shorter in most DUM neurons than in auditory sensory neurons. Patterned stimuli with known behavioral relevance evoked a broad range of responses in DUM neurons: low-pass, band-pass, and high-pass characteristics were encountered. Temporal and carrier frequency processing were not correlated. Those DUM neurons producing action potentials showed divergent processing of temporal patterns when the graded potential or the spiking was analyzed separately. The extent of membrane potential fluctuations mimicking the patterned stimuli was different between otherwise similarly responding neurons. Different kinds of inhibition were apparent and their relevance for temporal processing is discussed.

Keywords

Hearing Insect Temporal filtering Exponential fit Inhibition 

Notes

Acknowledgements

The project was funded by the German Science Foundation DFG STU 189/9-1 granted to AS. George Theophilidis, Aristotle University of Thessaloniki, Greece, helped with the permit to catch and export the insects. We thank Martin Göpfert for ongoing support. Heribert Gras gave numerous hints for using the Spike2 languages. Matthias Hennig initiated the use of intensity series of longer block stimuli for characterizing basic properties of temporal processing. We thank two anonymous reviewers for numerous helpful suggestions and Deborah Goggin (A.T. Still University) for meticulous proof reading and improving the English language.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Supplementary material

359_2019_1359_MOESM1_ESM.doc (1.6 mb)
Supplementary material 1 (DOC 1629 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department Cellular NeurobiologyUniversity of Göttingen, Johann-Friedrich-Blumenbach-Institute of Zoology and AnthropologyGöttingenGermany
  2. 2.ReugnyFrance
  3. 3.School of Life Science, Baden Lab for Vision and Visual EcologyUniversity of SussexFalmerUK
  4. 4.Kirksville College of Osteopathic MedicineA.T. Still UniversityKirksvilleUSA

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