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Conf Proc IEEE Eng Med Biol Soc. 2012;2012:3572-5. doi: 10.1109/EMBC.2012.6346738.

A mechanism for eye position effects on spontaneous nystagmus.

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1
Department of Otorhinolaryngology, Head and Neck Surgery, Vestibulo-Oculomotor Laboratory, University Hospital Zürich, Zürich, Switzerland . elham.khojasteh@mail.mcgill.ca

Abstract

In acute stages of unilateral vestibular deficit, the imbalanced tonic activity on vestibular afferents evokes spontaneous nystagmus. The slow-phase velocity of this nystagmus varies with eye position, such that it is smaller when looking in the direction of slow-phases. The neural mechanism for this behavior is still not understood. Here, using a simple control system model, we show that plausible changes in the neural responses within the central vestibulo-ocular reflex pathway are adequate to cause eye position dependent effects in the nystagmus pattern. The proposed transformations in population response functions could happen immediately following a lesion and can be useful to stabilize gaze in part of the gaze field.

PMID:
23366699
DOI:
10.1109/EMBC.2012.6346738
[Indexed for MEDLINE]
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