Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus

Papadopoulou N, Stelter M, Lepreux G, Dürr V (2018)
Proceedings of the German Zoological Society: NB 3.

Kurzbeitrag Konferenz / Poster | Englisch
 
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Abstract / Bemerkung
Sensory systems adjust their sensitivity through adaptation, i.e., a history-dependent shift of the stimulus-response characteristic. For example, in motion-encoding proprioceptors, adaptation to constant stimulation during continuous active movement could ensure high responsiveness to changes in movement speed. In the stick insect Carausius morosus, continuous active movement occurs during active tactile exploration movements of the antennae. As walking stick insects reliably respond to antennal tactile cues with targeted leg movements, adaptation of neurons of the antennal-mechanosensory pathway should affect the information transfer from the head to the legs. Here, we measure adaptation in an identified descending interneuron that conveys antennal proprioceptive information to the thoracic ganglia: The contralateral ON-type velocity-sensitive (cONv) interneuron. This interneuron encodes antennal-joint velocity as well as substrate vibration (Ache et al., 2015, J.Neurosci., 35:4081). Preliminary results showed that cONv reduces its response to repeated antennal deflection suggesting adaptation. Here, we ask whether multimodal activation of cONv can lead to a change in response intensity of the neuron when compared to unimodal stimulation. Using hook-electrode connective recordings, we examined the responses of the bilateral pair of cONv interneurons to antennal ramp-and-hold deflections at one of two ramp velocities. We found that cONv reached the same level of adaptation after 20 ramps irrespective of the velocity imposed, implying faster adaptation at higher velocity. Imposed movements of the opposite antenna did not affect the level of adaptation of cONv, while substrate vibration delivered at a rate comparable to footfall during walking set cONv into the adapted state, suggesting cross-modal adaptation
Stichworte
crossmodal; Adaptation; interneuron; Stick Insect; STICK-INSECT; insect; Carausius; sensory; sensory system; SYSTEMS; SYSTEM; SENSITIVITY; PROPRIOCEPTORS; proprioceptor; stimulation; MOVEMENT; RESPONSIVENESS; speed; Carausius morosus; CARAUSIUS-MOROSUS; tactile; MOVEMENTS; Antennae; Walking; Walking stick; WALKING STICK INSECT; STICK INSECTS; INSECTS; Cues; leg; LEG MOVEMENTS; Leg movement; neurons; neuron; INFORMATION; Head; LEGS; proprioceptive; THORACIC GANGLIA; contralateral; ENCODES; antennal joint; velocity; Substrate; substrate vibration; Vibration; ACTIVATION; intensity; connective; RESPONSES; interneurons; imposed movement
Erscheinungsjahr
2018
Art.-Nr.
NB 3
Konferenz
111th Annual Meeting of the German Zoological Society
Konferenzort
Greifswald
Konferenzdatum
2018-09-11 – 2018-09-14
ISSN
0070-4342
Page URI
https://pub.uni-bielefeld.de/record/2931673

Zitieren

Papadopoulou N, Stelter M, Lepreux G, Dürr V. Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus. Proceedings of the German Zoological Society. 2018: NB 3.
Papadopoulou, N., Stelter, M., Lepreux, G., & Dürr, V. (2018). Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus. Proceedings of the German Zoological Society, NB 3
Papadopoulou, N., Stelter, M., Lepreux, G., and Dürr, V. (2018). Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus. Proceedings of the German Zoological Society:NB 3.
Papadopoulou, N., et al., 2018. Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus. Proceedings of the German Zoological Society, : NB 3.
N. Papadopoulou, et al., “Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus”, Proceedings of the German Zoological Society, 2018, : NB 3.
Papadopoulou, N., Stelter, M., Lepreux, G., Dürr, V.: Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus. Proceedings of the German Zoological Society. : NB 3 (2018).
Papadopoulou, Nia, Stelter, Marie, Lepreux, Gaetan, and Dürr, Volker. “Cross-modal adaptation in a descending interneuron in the stick insect Carausius morosus”. Proceedings of the German Zoological Society (2018): NB 3.

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