Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus

Lepreux G, Haupt SS, Dürr V (2018)
Proc. Int. Soc. Neuroethol.

Kurzbeitrag Konferenz / Poster | Englisch
 
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Abstract / Bemerkung
Stick insects actively move their antennae to scan their surroundings during walking. When an antenna touches an obstacle the animal often reacts with a rapid reaching movement of the front leg. An identified descending interneuron potentially involved in this behavior is the contralateral ON-type velocity-sensitive neuron (cONv), that connects the brain to the thoracic ganglia. cONv encodes both antennal joint-angle velocity and substrate vibration. In stationary animals, cONv has highly fluctuating spontaneous activity that may reach rates similar to those measured during antennal movement at moderate velocities. How can cONv reliably encode joint movement in the presence of such strongly fluctuating spontaneous activity and how does it respond depending on the behavioural state and stimulus history of the animal. To answer these questions, we recorded the bilateral pair of cONv and tracked antennal motion in stationary animals. Substrate vibration induced by taps onto the table were encoded with a single spike per tap. Taps delivered at the frequency of footfall during walking reduced spontaneous activity of both neurons. Antennal stimulation did so only in the neuron contralateral to the antenna that moved. Preliminary results suggest that the combination of both modalities reduces the spontaneous activity more than a single modality. Furthermore, we found no movement-related modulation of cONv activity during active exploration, suggesting a strong dependence on behavioural state. Preliminary results show that responses to interrupted active antennal movements resemble those to passive deflection, implying that cONv acts as a reliable antennal contact detector under behaviourally relevant conditions.
Erscheinungsjahr
2018
Konferenz
International Congress of Neuroethology
Konferenzort
Brisbane
Konferenzdatum
2018-07-15 – 2018-07-20
Page URI
https://pub.uni-bielefeld.de/record/2931830

Zitieren

Lepreux G, Haupt SS, Dürr V. Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus. Proc. Int. Soc. Neuroethol. 2018.
Lepreux, G., Haupt, S. S., & Dürr, V. (2018). Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus. Proc. Int. Soc. Neuroethol.
Lepreux, G., Haupt, S. S., and Dürr, V. (2018). Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus. Proc. Int. Soc. Neuroethol.
Lepreux, G., Haupt, S.S., & Dürr, V., 2018. Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus. Proc. Int. Soc. Neuroethol.
G. Lepreux, S.S. Haupt, and V. Dürr, “Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus”, Proc. Int. Soc. Neuroethol., 2018.
Lepreux, G., Haupt, S.S., Dürr, V.: Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus. Proc. Int. Soc. Neuroethol. (2018).
Lepreux, Gaetan, Haupt, Stefan S., and Dürr, Volker. “Context- and state-dependent activation of a descending interneuron in the stick insect Carausius morosus”. Proc. Int. Soc. Neuroethol. (2018).

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