On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps

Theunissen L, Dürr V (2012)
Presented at the FENS Forum of Neuroscience 2012, Barcelona.

Conference Abstract | Published | English

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Keywords
whereas the direction of short steps varies much more and depends on lift-off position. From their different functional and statistical properties ; the major parameters of the probability distributions remained within narrow bounds for different conditions ; indicating that the classification into two distinct classes of steps is context-independent. With respect to the functional properties ; showing two distinct peaks for all types of legs. The empirical distribution could be well-described by the sum of a gamma and a logistic probability distribution. Although the proportion of short step lengths increased with the height of the stairs ; we focus on the natural distribution of step length. We show that step length distributions are bimodal ; head and legs ; the animals climbed stairs of different height. Kinematic analysis yielded 3D-positions of 27 joints and the corresponding time courses of 42 degrees of freedom of movement. Here ; allowing the analysis of several thousands of steps. Having been labeled with up to 20 reflective markers on their thorax ; we present data of unrestrained walking and climbing stick insects that hints at such a signature: the existence of two classes of steps. We recorded whole-body kinematics of stick insects with a motion capture system ; For understanding the behavioral relevance of putative mechanisms underlying context-dependent control of locomotion ; the interplay between rhythmic pattern generators and postural reflexes is likely to leave characteristic signatures in the temporal pattern of whole-body coordination. Here ; we conclude that stick insects take two distinct kinds of steps during locomotion ; natural movement sequences in unrestrained locomotion have to be known. For example ; short steps occur more often on stairs than on plane surfaces. Lift-off positions of short steps are located more anteriorly than those of long steps. The swing movement of long steps is typically directed anteriorly ; suggesting distinct underlying mechanisms. Supported by EU-project EMICAB (FP7-ICT-270182)
Publishing Year
Conference
FENS Forum of Neuroscience 2012
Location
Barcelona
Conference Date
14.-18.07.2012
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Cite this

Theunissen L, Dürr V. On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps. Presented at the FENS Forum of Neuroscience 2012, Barcelona.
Theunissen, L., & Dürr, V. (2012). On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps. Presented at the FENS Forum of Neuroscience 2012, Barcelona.
Theunissen, L., and Dürr, V. (2012).“On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps”. Presented at the FENS Forum of Neuroscience 2012, Barcelona.
Theunissen, L., & Dürr, V., 2012. On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps. Presented at the FENS Forum of Neuroscience 2012, Barcelona.
L. Theunissen and V. Dürr, “On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps”, Presented at the FENS Forum of Neuroscience 2012, Barcelona, 2012.
Theunissen, L., Dürr, V.: On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps. Presented at the FENS Forum of Neuroscience 2012, Barcelona (2012).
Theunissen, Leslie, and Dürr, Volker. “On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps”. Presented at the FENS Forum of Neuroscience 2012, Barcelona, 2012.
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