Universität zu Köln

Borgmann, Anke, Toth, Tibor I., Gruhn, Matthias, Daun-Gruhn, Silvia and Bueschges, Ansgar (2011). Dominance of local sensory signals over inter-segmental effects in a motor system: experiments. Biol. Cybern., 105 (5-6). S. 399 - 412. NEW YORK: SPRINGER. ISSN 1432-0770

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Abstract

Legged locomotion requires that information local to one leg, and inter-segmental signals coming from the other legs are processed appropriately to establish a coordinated walking pattern. However, very little is known about the relative importance of local and inter-segmental signals when they converge upon the central pattern generators (CPGs) of different leg joints. We investigated this question on the CPG of the middle leg coxa-trochanter (CTr)-joint of the stick insect which is responsible for lifting and lowering the leg. We used a semi-intact preparation with an intact front leg stepping on a treadmill, and simultaneously stimulated load sensors of the middle leg. We found that middle leg load signals induce bursts in the middle leg depressor motoneurons (MNs). The same local load signals could also elicit rhythmic activity in the CPG of the middle leg CTr-joint when the stimulation of middle leg load sensors coincided with front leg stepping. However, the influence of front leg stepping was generally weak such that front leg stepping alone was only rarely accompanied by switching between middle leg levator and depressor MN activity. We therefore conclude that the impact of the local sensory signals on the levator-depressor motor system is stronger than the inter-segmental influence through front leg stepping.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Borgmann, Anke UNSPECIFIED UNSPECIFIED UNSPECIFIED Toth, Tibor I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruhn, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Daun-Gruhn, Silvia UNSPECIFIED UNSPECIFIED UNSPECIFIED Bueschges, Ansgar UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-483698
DOI:	10.1007/s00422-012-0473-y
Journal or Publication Title:	Biol. Cybern.
Volume:	105
Number:	5-6
Page Range:	S. 399 - 412
Date:	2011
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-0770
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FEMUR-TIBIA JOINT; STICK INSECT LEG; CENTRAL NERVOUS-SYSTEM; RAT SPINAL-CORD; CAMPANIFORM SENSILLA; CARAUSIUS-MOROSUS; WALKING SYSTEM; NEONATAL-RAT; INTERSEGMENTAL COORDINATION; PATTERN GENERATION Multiple languages Computer Science, Cybernetics; Neurosciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48369