@inproceedings{2500758,
author = {Theunissen, Leslie and Dürr, Volker},
keyword = {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)},
location = {Barcelona},
title = {{On the natural statistics of unrestrained locomotion: Insects take two distinct kinds of steps}},
year = {2012},
}