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Induced extraocular muscle afferent signals: from pigeons to people

Knox, Paul (2008) Induced extraocular muscle afferent signals: from pigeons to people. In: Using eye movements as an experimental probe of brain function - a symposium in honor of Jean Büttner-Ennever. Progress in Brain Research, 171 (171). Elsevier, Amsterdam; Oxford, pp. 29-35. ISBN 9780444531636; 0444531637 (hbk.)

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While the muscles which move the eyes, the extraocular muscles (EOM), are well endowed with proprioceptors, afferent signals from these receptors are usually assumed to play little or no role in the control of eye movement. In a series of experiments, a suction contact lens was used to impose movements on one eye, thus inducing afferent signals. Single unit activity was recorded centrally (to examine the interactions between EOM afferent signals and visual or vestibular signals), or the movements of the other eye were measured (to investigate their effects on the output of the oculomotor system). In a model preparation, the decerebrate pigeon, EOM afferent signals modified single unit activity in the medial vestibular nucleus, and the third and sixth motor nuclei, during sinusoidal vestibular stimulation. When one eye was moved to mimic the VOR, movement faster than required for compensation for a given head velocity reduced the gain of single unit vestibular responses. In awake, alert, pigeons the overall output of the VOR, as evidenced by movements of the other eye, was modified. In humans, when one eye was impeded, the saccades and smooth pursuit executed by the other eye were altered. Taken together, these results suggest that EOM afferent signals play a functional role in the shaping of eye movement.

Item Type:Book Section
Additional Information:Available online 19 August 2008. Based on the proceedings of a conference, "Using Eye Movements as an Experimental Probe of Brain Function," held at the Charing Cross Hospital Campus of Imperial College London, UK on 5th -6th December, 2007 to honor Professor Jean Büttner-Ennever.
Uncontrolled Keywords:eye movements; saccades; smooth pursuit; extraocular muscles; afferents; motor control
Subjects:Q Science > QP Physiology
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Medicine > School of Health Sciences
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ID Code:1290
Deposited On:15 Jun 2010 12:06
Last Modified:14 Feb 2013 16:08

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