Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway
Ache JM, Dürr V (2013)
Journal of Neurophysiology 110(9): 2099-2112.
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Abstract
Much like mammals use their whiskers, insects use their antennae for tactile near-range
orientation during locomotion. Stick insects rapidly transfer spatial information about
antennal touch location to the front legs, allowing for aimed reach-to-grasp movements. This
adaptive behavior requires a spatial coordinate transformation from “antennal contact space”
to “leg posture space”. Therefore, a neural pathway must convey proprioceptive and tactile
information about antennal posture and contact site to thoracic motor networks. Here, we
analyze proprioceptive encoding properties of descending interneurons (DINs) that convey
information about antennal posture and movement to the thoracic ganglia. Based on the
response properties of 110 DINs to imposed movement of the distal antennal joint, we
distinguish five functional DIN groups according to their sensitivity to three parameters:
movement direction, movement velocity, and antennal joint angle. These groups are: Simple
position-sensitive DINs which signal the antennal joint angle; Dynamic position-sensitive
DINs which signal the joint angle with strong dependency on movement; Unspecific
movement-sensitive DINs which signal movement but not the velocity, position or direction of
movement; and ON- and OFF-type velocity-sensitive DINs. The activity of the latter two is
increased/attenuated during antennal movement with the spike rate increasing/decreasing
linearly with antennal joint angle velocity. Some movement-sensitive DINs convey spikes to
the thorax within 11 ms, suggesting a rapid, direct pathway from antennal mechanosensory to
thoracic motor networks. We discuss how the population of DINs could provide the neural
basis for the intersegmental spatial coordinate transfer between a touch sensor of the head and
thoracic motor networks.
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Ache JM, Dürr V. Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway. Journal of Neurophysiology. 2013;110(9):2099-2112.
Ache, J. M., & Dürr, V. (2013). Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway. Journal of Neurophysiology, 110(9), 2099-2112. doi:10.1152/jn.00281.2013
Ache, J. M., and Dürr, V. (2013). Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway. Journal of Neurophysiology 110, 2099-2112.
Ache, J.M., & Dürr, V., 2013. Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway. Journal of Neurophysiology, 110(9), p 2099-2112.
J.M. Ache and V. Dürr, “Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway”, Journal of Neurophysiology, vol. 110, 2013, pp. 2099-2112.
Ache, J.M., Dürr, V.: Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway. Journal of Neurophysiology. 110, 2099-2112 (2013).
Ache, Jan Marek, and Dürr, Volker. “Encoding of near-range spatial information by descending interneurons in the stick insect antennal mechanosensory pathway”. Journal of Neurophysiology 110.9 (2013): 2099-2112.
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