Eye movements induced by lateral acceleration steps
Effect of visual context and acceleration levels |
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Authors: | C C Gianna Michael A Gresty Adolfo M Bronstein |
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Institution: | (1) MRC, Human Movement and Balance Unit, National Hospital, Queen Square, London, WC1N 3BG, UK; Fax: +44-171 837 7281, e-mail: cgianna@ion.bpmf.ac.uk, GB |
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Abstract: | Eye movement responses were obtained from six normal subjects exposed to randomly ordered rightwards/leftwards linear acceleration
steps of 0.05 g, 0.1 g or 0.24 g amplitude and 650 ms duration along the inter-aural axis. With the instruction to gaze passively into the darkness, compensatory nystagmus was evoked with slow-phase velocity sensitivity of 49° s−1
g
−1. When subjects viewed earth-fixed targets at 30 cm, 60 cm or 280 cm, eye movements at 130 ms from motion onset were proportional to acceleration and inversely proportional
to target distance, before the onset of visually guided eye movements. Our results show that a modulation with viewing distances
of the earliest human otolith-ocular reflexes occurs in the presence of pure linear acceleration. However, full compensation
was not attained for the nearer targets and higher accelerations.
Received: 31 January 1996 / Accepted: 30 September 1996 |
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Keywords: | Otolith ocular reflex Linear acceleration Eye movements Vestibular function Human |
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