Universität zu Köln

Schmitz, Joscha, Gruhn, Matthias and Bueschges, Ansgar (2019). Body side-specific changes in sensorimotor processing of movement feedback in a walking insect. J. Neurophysiol., 122 (5). S. 2173 - 2187. BETHESDA: AMER PHYSIOLOGICAL SOC. ISSN 1522-1598

Full text not available from this repository.

Abstract

Feedback from load and movement sensors can modify timing and magnitude of the motor output in the stepping stick insect. One source of feedback is stretch reception by the femoral chordotonal organ (fCO), which encodes such parameters as the femorotibial (Fri) joint angle, the angular velocity, and its acceleration. Stimulation of the fCO causes a postural resistance reflex. during quiescence, and can elicit the opposite, so-called active reaction (AR), which assists ongoing flexion during active movements. In the present study, we investigated the role of fCO feedback for the difference in likelihood of generating ARs on the inside vs. the outside during curve stepping. We analyzed the effects of fCO stimulation on the motor output to the FTi and the neighboring coxa-trochanter and thorax-coxa joints of the middle leg. In inside and outside turns, the probability for ARs increases with increasing starting angle and decreasing stimulus velocity; furthermore, it is independent of the total angular excursion. However, the transition between stance and swing motor activity always occurs after a specific angular excursion, independent of the turning direction. Feedback from the fCO also has an excitatory influence on levator trochanteris motoneurons (MNs) during inside and outside turns, whereas the same feedback affects protractor coxae MNs only during outside steps. Our results suggest joint- and body side-dependent processing of fCO feedback. A shift in gain may be responsible for different AR probabilities between inside and outside turning, whereas the general control mechanism for ARs is unchanged. NEW & NOTEWORTHY We show that parameters of movement feedback from the tibia in an insect during curve walking are processed in a body side-specific manner, and how. From our results it is highly conceivable that the difference in motor response to the feedback supports the body side-specific leg kinematics during turning. Future studies will need to determine the source for the inputs that determine the local changes in sensory-motor processing.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schmitz, Joscha UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruhn, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Bueschges, Ansgar UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-129155
DOI:	10.1152/jn.00436.2019
Journal or Publication Title:	J. Neurophysiol.
Volume:	122
Number:	5
Page Range:	S. 2173 - 2187
Date:	2019
Publisher:	AMER PHYSIOLOGICAL SOC
Place of Publication:	BETHESDA
ISSN:	1522-1598
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FEMORAL CHORDOTONAL ORGAN; ANKLE EXTENSOR ACTIVITY; TIBIA CONTROL-SYSTEM; STICK INSECT; SLIPPERY SURFACE; REFLEX REVERSAL; JOINT-CONTROL; PRESYNAPTIC INHIBITION; SUPRASPINAL CONTROL; PATTERN GENERATION Multiple languages Neurosciences; Physiology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12915