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J Neurophysiol (September 10, 2003). doi:10.1152/jn.00762.2003
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Submitted on August 6, 2003
Accepted on September 4, 2003

Timing of knee-related spinal neurons during fictive rostral scratching in the turtle

Paul S. Stein1* and Susan Daniels-McQueen1

1 Department of Biology, Washington University, St. Louis, MO, USA

* To whom correspondence should be addressed. E-mail: stein{at}biology.wustl.edu.

Knee-flexor motor activity rhythmically alternated with knee-extensor motor activity during fictive rostral scratching in the spinal turtle. A critical transition from knee-flexor motor activity to knee-extensor motor activity occurred during hip-flexor motor activity. A key feature of this transition was that the end-phases of knee-flexor motor activity were positively correlated with the start-phases of knee-extensor motor activity. We studied spinal interneurons with activities related to this transition. We previously (Stein and Daniels-McQueen 2002a) used single-unit recording techniques to characterize a data set of descending propriospinal interneurons during rostral scratching. We focused here on a group of interneurons from this data set with start-phases ("ON-units") or with end-phases ("OFF-units") near the start of knee-extensor motor activity. We showed that, for a subset of these units, the start-phases of ON-units and the end-phases of OFF-units were positively correlated with the start-phases of knee-extensor motor activity. We present the hypothesis that some of these knee-related ON- and OFF-units may play a role in timing knee motor activity during rostral scratching.




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