Interlimb coordinating factors during driven walking in Crustacea

Chasserat, C.; Clarac, François

doi:10.1007/bf00610461

Cited by 33 publications

(16 citation statements)

References 33 publications

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“…The animals were tethered at the carapace and walked on a motor driven treadmill. The weight of the tether was counter-balanced so that the animal supported only its own weight (for details see Chasserat and Clarac, 1980). Anterior extreme position (AEP) and posterior extreme position (PEP) of legs (legs 3, 4, and 5) were measured using a ruler fixed outside the aquarium parallel to the longitudinal axis of the body.…”

Section: Methodsmentioning

confidence: 99%

The control of walking movements in the leg of the rock lobster

1983

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Abstract. 1. Experiments with rock lobsters walking on a treadmill were undertaken to obtain information upon the system controlling the movement of the legs. Results show that the position of the leg is an important parameter affecting the cyclic movement of the walking leg. Stepping can be interrupted when the geometrical conditions for terminating either a return stroke or a power stroke are not fullfilled. 2. The mean value of anterior and posterior extreme positions (AEP and PEP respectively) of the walking legs do not depend on the walking speed (Fig. 1). 3. When one leg is isolated from the other walking legs by placing it on a platform the AEPs and PEPs of the other legs show a broader distribution compared to controls (Figs. 2 and 3). 4. Force measurements (Fig. 4) are in agreement with the hypothesis that the movement of the leg is controlled by a position servomechanism. 5. When one leg stands on a stationary force transducer this leg develops forces which oscillate with the step rhythm of the other legs (Fig. 5). 6. A posteriorly directed influence is found, by which the return stroke of a leg can be started when the anterior leg performs a backward directed movement. 7. Results are compared with those obtained from stick insects. The systems controlling the movement of the individual leg are similar in both, lobster and stick insect but the influences between the legs seem to be considerably different.

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Section: Methodsmentioning

confidence: 99%

The control of walking movements in the leg of the rock lobster

1983

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“…In the latter case the animal was tethered at the carapace and the weight of the holder was counter-balanced so that the animal could choose its own distance to the ground [see Chasserat and Clarac (1980) for details]. The results were recorded on magnetic tape or directly on a pen recorder (Gould Brush 2200).…”

Section: Methodsmentioning

confidence: 99%

“…Results of Ayers and Davis (1977) seem to show a corresponding tendency which is however much less obvious when using electrophysiological techniques. The increase of the force might be the result of a conflict between the walking speed intended by the animal and the actual speed of the treadmill (Chasserat and Clarac, 1980;Cruse and Clarac, in preparation). One possible explanation of this observation is to assume a servomechanism controlling the position of each leg.…”

Section: Comparison Between Free and Treadmill Walkingmentioning

confidence: 99%

“…In normal walking this animal is not using leg 1 und 2. Also leg 3 is not always used in walking and then often in a irregular way (Chasserat and Clarac, 1980). Therefore only leg 4 and 5 are investigated here.…”

Section: Introductionmentioning

confidence: 99%

“…Several earlier experiments are done with animals walking on a motor driven treadmill (Ayers and Davis, 1977;Chasserat and Clarac, 1980). However, it is not clear whether in this situation the legs show active power strokes as the free walking animal does or does it merely develop weak forces and sometimes even passive movements.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of forces developed by the leg of the rock lobster when walking free or on a treadmill

Clarac

Cruse

1982

Biol. Cybern.

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Summary.In the free walking rock lobster the forces developed by legs 4 and 5 were investigated during the power stroke. Two orthogonal force components lying in the horizontal plane were measured. Based on these results the different tasks of the two legs during walking are discussed. The forces developed by leg 4 were compared when the animal walked freely and on a treadmill. In these two situations the results differ qualitatively as in driven walking the forces are nearly identical in a long series of consecutive steps whereas in free walking the forces can vary greatly from step to step. However, similar mean values of force were measured with those on the treadmill being somewhat higher. This shows that, although the treadmill is driven by a motor, the animal does perform active walking movements. In the treadmill situation the forces increase as the speed of treadmill motor is decreased.

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Influence of walking on swimmeret beating in the lobster Homarus gammarus

Cattaert¹,

Clarac²

1983

J. Neurobiol.

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188

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Influence of walking on swimmeret beating in intact lobsters, Homarus gammarus, has been analyzed using a treadmill experimental device. Belt movement activates both leg stepping and swimmeret beating. The simultaneity of the onset of the two motor systems in this situation is demonstrated to be the result of a startle response initiated when the belt begins to move. This reaction consists of a non-specific motor activity involving several antagonist postural and dynamic muscles. Abdominal extension and vigorous swimmeret beating are the main features of this reaction. The main characteristics of the swimmeret beating as defined by Davis (1969) has been observed here in sequences without walking. However during long walking sequences a very different swimmeret beating pattern occurs. It is suggested that this slow swimmeret beating is completely subordinate to the walking rhythm during sequences of absolute coordination. In more rapid swimmeret beating a relative coordination with leg stepping is very common. The functional meaning of this linkage between legs and swimmerets is discussed.

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Interlimb coordinating factors during driven walking in Crustacea

Cited by 33 publications

References 33 publications

The control of walking movements in the leg of the rock lobster

The control of walking movements in the leg of the rock lobster

Comparison of forces developed by the leg of the rock lobster when walking free or on a treadmill

Influence of walking on swimmeret beating in the lobster Homarus gammarus

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