Abstract
Assessing interindividual variability of brain activation is of practical importance to the use of functional magnetic resonance imaging (fMRI) in the clinical context. The main objective of this study is to analyze the variability of the oculomotor system through horizontal optokinetic, pursuit and saccadic eye movement stimulations by means of fMRI. We found significant activation of many cortical and subcortical structures. The frequency of activation demonstrates a high variability between subjects. However, the most frequent activation regions were located in frontal areas and in regions comprising the middle temporal and medial superior temporal areas. Our study allowed the characterization of the most frequently involved foci in optokinetic stimulation, pursuit and saccadic eye movement tasks. The combination of these tasks constitutes a suitable tool for mapping major areas involved in the oculomotor system.
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Acknowledgments
The authors are grateful to L. Rocha and J. L. Aziani for technical support. Also we wish to thank CAPES, CNPq and FAPESP for partial financial support.
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This work was done at the University of Sao Paulo, Campus Ribeirao Preto, Brazil.
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Della-Justina, H.M., Pastorello, B.F., Santos-Pontelli, T.E.G. et al. Human Variability of fMRI Brain Activation in Response to Oculomotor Stimuli. Brain Topogr 20, 113–121 (2008). https://doi.org/10.1007/s10548-007-0037-y
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DOI: https://doi.org/10.1007/s10548-007-0037-y