Abstract
1. EMG responses from sternocleidomastoid (SCM) and orbicularis oculi were recorded in subjects who lay supine with their heads cradled in a sling. When the sling released abruptly, their heads fell freely. Normal and bilateral labyrinthine-defective subjects (LDs) were studied. 2. The normal response in SCM was a small burst of excitation at 22-25 ms latency, of 18 ms duration. This merged into a larger, later burst. The drop also produced eye blinks at 22-38 ms. 3. The onset of the SCM response in LDs was delayed (56-73 ms) even though the latency of their eye blinks was normal. 4. We conclude that the early response at approximately 22 ms in normal subjects is mediated by a vestibulocollic reflex. The delayed activity in LDs may be a stretch reflex. This is the first demonstration of the latency of the vestibulocollic pathway to natural stimulation in man.
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Selected References
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- Bisdorff A. R., Bronstein A. M., Gresty M. A. Responses in neck and facial muscles to sudden free fall and a startling auditory stimulus. Electroencephalogr Clin Neurophysiol. 1994 Dec;93(6):409–416. doi: 10.1016/0168-5597(94)90146-5. [DOI] [PubMed] [Google Scholar]
- Colebatch J. G., Halmagyi G. M., Skuse N. F. Myogenic potentials generated by a click-evoked vestibulocollic reflex. J Neurol Neurosurg Psychiatry. 1994 Feb;57(2):190–197. doi: 10.1136/jnnp.57.2.190. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Colebatch J. G., Halmagyi G. M. Vestibular evoked potentials in human neck muscles before and after unilateral vestibular deafferentation. Neurology. 1992 Aug;42(8):1635–1636. doi: 10.1212/wnl.42.8.1635. [DOI] [PubMed] [Google Scholar]
- Fernandez C., Goldberg J. M. Physiology of peripheral neurons innervating semicircular canals of the squirrel monkey. II. Response to sinusoidal stimulation and dynamics of peripheral vestibular system. J Neurophysiol. 1971 Jul;34(4):661–675. doi: 10.1152/jn.1971.34.4.661. [DOI] [PubMed] [Google Scholar]
- Fernández C., Goldberg J. M. Physiology of peripheral neurons innervating otolith organs of the squirrel monkey. III. Response dynamics. J Neurophysiol. 1976 Sep;39(5):996–1008. doi: 10.1152/jn.1976.39.5.996. [DOI] [PubMed] [Google Scholar]
- Kanaya T., Gresty M. A., Bronstein A. M., Buckwell D., Day B. Control of the head in response to tilt of the body in normal and labyrinthine-defective human subjects. J Physiol. 1995 Dec 15;489(Pt 3):895–910. doi: 10.1113/jphysiol.1995.sp021102. [DOI] [PMC free article] [PubMed] [Google Scholar]