Article Text

Preliminary investigation of somatosensory evoked potentials in equine headshaking
  1. K. J. Pickles, BVMS, MSc, CertEM (IntMed), PhD, DipECEIM, MRCVS,
  2. T. J. Gibson, BSc, PGDipSci, PhD,
  3. C. B. Johnson, BVSc, DVA, DipECVA, PhD,
  4. V. Walsh, BVSc,
  5. J. C. Murrell, BVSc, PhD, DipECVA, MRCVS and
  6. J. E. Madigan, DVM, DipACVIM
  1. Veterinary Teaching Hospital, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
  1. E-mail for correspondence kjpickles{at}
  • Dr Gibson's present address is Department of Veterinary Clinical Sciences, Royal Veterinary College, Royal College Street, London NW1 0TU

  • Dr Pickles' and Dr Madigan's present address is Department of Veterinary Medicine and Epidemiology, University of Davis, California, Davis, CA 95616, USA

  • Dr Murrell's present address is Department of Clinical Veterinary Science, University of Bristol, Langford House, Langford, North Somerset BS40 5DU

The aim of this study was to develop a technique for recording electrical activity of the equine cerebral cortex following application of a noxious electrical stimulus to the maxillary branch of the trigeminal nerve in order to investigate trigeminal nerve neurophysiology in control and headshaking horses. Triphasic somatosensory evoked potentials (SEPs) were recorded using subcutaneous needle electrodes in four control and four headshaking horses under general anaesthesia. Dural electroencephalography electrodes were used to record SEPs in one further control and one further headshaking horse. Headshaking horses appeared to have decreased middle latency and inter-peak intervals following stimulation of the trigeminal nerve compared with control horses, supporting abnormal trigeminal nerve physiology in equine headshaking

Statistics from


  • Provenance not commissioned; externally peer reviewed

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.