Imperial College London
Alternate

Dr Qadeer Arshad

Faculty of Medicine, Faculty of Medicine Centre

Honorary Clinical Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 3313 5527q.arshad

 
 
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Location

 

Lab BlockCharing Cross Campus

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Summary

 

Publications

Citation

BibTex format

@article{Roberts:2016:10.1152/jn.00895.2015,
author = {Roberts, RE and Da, Silva Melo M and Siddiqui, AA and Arshad, Q and Patel, M},
doi = {10.1152/jn.00895.2015},
journal = {Journal of Neurophysiology},
pages = {1480--1487},
title = {Vestibular and oculomotor influences on visual dependency.},
url = {http://dx.doi.org/10.1152/jn.00895.2015},
volume = {116},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The degree to which a person relies on visual stimuli for spatial orientation is termed visual dependency (VD). VD is considered a perceptual trait or cognitive style influenced by psychological factors and mediated by central re-weighting of the sensory inputs involved in spatial orientation. VD is often measured using the rod-and-disk test, wherein participants align a central rod to the subjective visual vertical (SVV) in the presence of a background that is either stationary or rotating around the line of sight - dynamic SVV. Although this task has been employed to assess VD in health and vestibular disease, it is unknown what effect torsional nystagmic eye movements may have on individual performance. Using caloric ear irrigation, 3D video-oculography and the rod-and-disk test, we show that caloric torsional nystagmus modulates measures of visual dependency and demonstrate that increases in tilt after irrigation are positively correlated with changes in ocular torsional eye movements. When the direction of the slow phase of the torsional eye movement induced by the caloric is congruent with that induced by the rotating visual stimulus, there is a significant increase in tilt. When these two torsional components are in opposition there is a decrease. These findings show that measures of visual dependence can be influenced by oculomotor responses induced by caloric stimulation. The findings are of significance for clinical studies as they indicate that VD, which often increases in vestibular disorders, is not only modulated by changes in cognitive style but also by eye movements, in particular nystagmus.
AU  - Roberts,RE
AU  - Da,Silva Melo M
AU  - Siddiqui,AA
AU  - Arshad,Q
AU  - Patel,M
DO  - 10.1152/jn.00895.2015
EP  - 1487
PY  - 2016///
SN  - 1522-1598
SP  - 1480
TI  - Vestibular and oculomotor influences on visual dependency.
T2  - Journal of Neurophysiology
UR  - http://dx.doi.org/10.1152/jn.00895.2015
UR  - http://www.ncbi.nlm.nih.gov/pubmed/27358321
UR  - http://hdl.handle.net/10044/1/34677
VL  - 116
ER  -
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