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Research Article

Visuomotor Transformation in the Fly Gaze Stabilization System

  • Stephen J Huston,

    Affiliations: Department of Zoology, University of Cambridge, Cambridge, United Kingdom, Department of Bioengineering, Imperial College London, London, United Kingdom, Division of Biology, California Institute of Technology, Pasadena, California, United States of America

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  • Holger G Krapp mail

    To whom correspondence should be addressed. E-mail: h.g.krapp@imperial.ac.uk

    Affiliations: Department of Zoology, University of Cambridge, Cambridge, United Kingdom, Department of Bioengineering, Imperial College London, London, United Kingdom

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  • Published: July 22, 2008
  • DOI: 10.1371/journal.pbio.0060173

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Data available online

Posted by stephenhuston on 26 Feb 2010 at 20:29 GMT

For sensory signals to control an animal's behavior, they must first be transformed into a format appropriate for use by its motor systems. This fundamental problem is faced by all animals, including humans. Beyond simple reflexes, little is known about how such sensorimotor transformations take place. Here we describe how the outputs of a well-characterized population of fly visual interneurons, lobula plate tangential cells (LPTCs), are used by the animal's gaze-stabilizing neck motor system. The LPTCs respond to visual input arising from both self-rotations and translations of the fly. The neck motor system however is involved in gaze stabilization and thus mainly controls compensatory head rotations. We investigated how the neck motor system is able to selectively extract rotation information from the mixed responses of the LPTCs. We recorded extracellularly from fly neck motor neurons (NMNs) and mapped the directional preferences across their extended visual receptive fields. Our results suggest that—like the tangential cells—NMNs are tuned to panoramic retinal image shifts, or optic flow fields, which occur when the fly rotates about particular body axes. In many cases, tangential cells and motor neurons appear to be tuned to similar axes of rotation, resulting in a correlation between the coordinate systems the two neural populations employ. However, in contrast to the primarily monocular receptive fields of the tangential cells, most NMNs are sensitive to visual motion presented to either eye. This results in the NMNs being more selective for rotation than the LPTCs. Thus, the neck motor system increases its rotation selectivity by a comparatively simple mechanism: the integration of binocular visual motion information.
http://plosbiology.org/article/info:doi/10.1371/journal.pbio.0060173#article1.front1.article-meta1.abstract1.p1

The receptive field data shown in this paper are available at either http://www.ugcs.caltech.edu/~huston/HustonKrapp2008_data.zip or through the CARMEN neuroscience repository: https://hildr.wrg.york.ac.uk/carmenportal (search term: HustonKrapp2008).

Competing interests declared: Author