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Processing of vestibular inputs by the medullary lateral tegmental field of conscious cats: implications for generation of motion sickness

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Abstract

The dorsolateral reticular formation of the caudal medulla, the lateral tegmental field (LTF), participates in generating vomiting. LTF neurons exhibited complex responses to vestibular stimulation in decerebrate cats, indicating that they received converging inputs from a variety of labyrinthine receptors. Such a convergence pattern of vestibular inputs is appropriate for a brain region that participates in generating motion sickness. Since responses of brainstem neurons to vestibular stimulation can differ between decerebrate and conscious animals, the current study examined the effects of whole-body rotations in vertical planes on the activity of LTF neurons in conscious felines. Wobble stimuli, fixed-amplitude tilts, the direction of which moves around the animal at a constant speed, were used to determine the response vector orientation, and also to ascertain whether neurons had spatial–temporal convergence (STC) behavior (which is due to the convergence of vestibular inputs with different spatial and temporal properties). The proportion of LTF neurons with STC behavior in conscious animals (25 %) was similar to that in decerebrate cats. Far fewer neurons in other regions of the feline brainstem had STC behavior, confirming findings that many LTF neurons receive converging inputs from a variety of labyrinthine receptors. However, responses to vertical plane vestibular stimulation were considerably different in decerebrate and conscious felines for LTF neurons lacking STC behavior. In decerebrate cats, most LTF neurons had graviceptive responses to rotations, similar to those of otolith organ afferents. However, in conscious animals, the response properties were similar to those of semicircular canal afferents. These differences show that higher centers of the brain that are removed during decerebration regulate the labyrinthine inputs relayed to the LTF, either by gating connections in the brainstem or by conveying vestibular inputs directly to the region.

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Acknowledgments

The authors thank Lucy Cotter for technical assistance. Funding was provided by Grant R01-DC003732 from the National Institutes of Health (USA).

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Authors and Affiliations

  1. Department of Otolaryngology, Eye and Ear Institute, University of Pittsburgh, Room 519, Pittsburgh, PA, 15213, USA

    Andrew A. McCall, Jennifer D. Moy, William M. DeMayo, Sonya R. Puterbaugh, Daniel J. Miller, Michael F. Catanzaro & Bill J. Yates

  2. Department of Neuroscience, University of Pittsburgh, Pittsburgh, PA, 15213, USA

    William M. DeMayo, Daniel J. Miller, Michael F. Catanzaro & Bill J. Yates

Authors
  1. Andrew A. McCall
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  2. Jennifer D. Moy
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  3. William M. DeMayo
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  4. Sonya R. Puterbaugh
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  5. Daniel J. Miller
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  6. Michael F. Catanzaro
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  7. Bill J. Yates
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Correspondence to Bill J. Yates.

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McCall, A.A., Moy, J.D., DeMayo, W.M. et al. Processing of vestibular inputs by the medullary lateral tegmental field of conscious cats: implications for generation of motion sickness. Exp Brain Res 225, 349–359 (2013). https://doi.org/10.1007/s00221-012-3376-1

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  • DOI: https://doi.org/10.1007/s00221-012-3376-1

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