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Primary motor cortex reports efferent control of vibrissa motion on multiple time scales

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Primary motor cortex reports efferent control of vibrissa motion on multiple time scales

Auteurs : Daniel N. Hill [États-Unis, Allemagne] ; John C. Curtis [États-Unis] ; Jeffrey D. Moore [États-Unis] ; David Kleinfeld [États-Unis]

Source :

Neuron [ 0896-6273 ] ; 2011.

RBID : PMC:3717360

Abstract

Exploratory whisking in rat is an example of self-generated movement on multiple time scales, from slow variations in the envelope of whisking to the rapid sequence of muscle contractions during a single whisk cycle. We find that, as a population, spike trains of single units in primary vibrissa motor cortex report the absolute angle of vibrissa position. This representation persists after sensory nerve transection, indicating an efferent source. About two-thirds of the units are modulated by slow variations in the envelope of whisking while relatively few units report rapid changes in position within the whisk cycle. The combined results from this study and past measurements, which show that primary sensory cortex codes the whisking envelope as a motor copy signal, imply that signals present in both sensory and motor cortices are necessary to compute coordinates based on vibrissa touch.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3717360

DOI: 10.1016/j.neuron.2011.09.020
PubMed: 22017992
PubMed Central: 3717360

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<front><div type="abstract" xml:lang="en"><p id="P1">Exploratory whisking in rat is an example of self-generated movement on multiple time scales, from slow variations in the envelope of whisking to the rapid sequence of muscle contractions during a single whisk cycle. We find that, as a population, spike trains of single units in primary vibrissa motor cortex report the absolute angle of vibrissa position. This representation persists after sensory nerve transection, indicating an efferent source. About two-thirds of the units are modulated by slow variations in the envelope of whisking while relatively few units report rapid changes in position within the whisk cycle. The combined results from this study and past measurements, which show that primary sensory cortex codes the whisking envelope as a motor copy signal, imply that signals present in both sensory and motor cortices are necessary to compute coordinates based on vibrissa touch.</p>
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  <front><journal-meta><journal-id journal-id-type="nlm-journal-id">8809320</journal-id>
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<contrib-group><contrib contrib-type="author"><name><surname>Hill</surname>
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<aff id="A1"><label>1</label>
Computational Neuroscience Graduate Program, University of California, San Diego, CA, USA</aff>
<aff id="A2"><label>2</label>
Department of Physics, Division of Physical Sciences, University of California, San Diego, CA, USA</aff>
<aff id="A3"><label>3</label>
Institute of Neuroscience, Technical University Munich, Germany</aff>
<aff id="A4"><label>4</label>
The Salk Institute for Biological Studies, San Diego, CA, USA</aff>
<aff id="A5"><label>5</label>
Section of Neurobiology, Division of Biological Sciences, University of California, San Diego, CA, USA</aff>
<author-notes><corresp id="cor1"><bold>Correspondence:</bold>
 David Kleinfeld, Department of Physics 0374, University of California, 9500 Gilman Drive, La Jolla, CA 92093, Office: 858-822-0342, Fax: 858-534-7697, <email>dk@physics.ucsd.edu</email>
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<pub-date pub-type="pmc-release"><day>21</day>
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<issue>2</issue>
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<permissions><copyright-statement>© 2011 Elsevier Inc. All rights reserved.</copyright-statement>
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<abstract><p id="P1">Exploratory whisking in rat is an example of self-generated movement on multiple time scales, from slow variations in the envelope of whisking to the rapid sequence of muscle contractions during a single whisk cycle. We find that, as a population, spike trains of single units in primary vibrissa motor cortex report the absolute angle of vibrissa position. This representation persists after sensory nerve transection, indicating an efferent source. About two-thirds of the units are modulated by slow variations in the envelope of whisking while relatively few units report rapid changes in position within the whisk cycle. The combined results from this study and past measurements, which show that primary sensory cortex codes the whisking envelope as a motor copy signal, imply that signals present in both sensory and motor cortices are necessary to compute coordinates based on vibrissa touch.</p>
</abstract>
<funding-group><award-group><funding-source country="United States">National Institute of Neurological Disorders and Stroke : NINDS</funding-source>
<award-id>R01 NS058668-04 || NS</award-id>
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Primary motor cortex reports efferent control of vibrissa motion on multiple time scales

Primary motor cortex reports efferent control of vibrissa motion on multiple time scales

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