Kinematics of nonstationary locomotion in the centipede <Emphasis Type="Italic">Scolopendra cingulata</Emphasis>: A single instant change of speed |
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Authors: | A L Karpovich |
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Institution: | (1) Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 127994, Russia |
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Abstract: | The spatiotemporal parameters of leg movement in Scolopendra instantly changing the locomotion speed from V
1 to V
2 ≠ V
1 are investigated. It is shown that (i) the principle of “in trail” leg placement is kept upon a change of speed; (ii) the
continuity of the metachronal coordination is not disturbed; but (iii) for some time after changing speed the set of ipsilateral
legs comprises (a) head-proximal legs creating a new trackway of steps with pace ℓ2, and (b) distal legs still using the old trackway with pace ℓ1. The two groups differ in kinematic parameters. Group (a) works in the stationary mode corresponding to speed V
2, while group (b) works in a transitory mode. Consecutively, with a metachronal wave propagating backwards along the body but immobile relative
to the ground, more and more legs from group (b) switch to the new stationary mode. |
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Keywords: | Chilopoda Scolopendra kinematics change of locomotion speed metachronal wave transitory mode |
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