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Hi, You might be interested in Nick Dowels work on using MRI to measure the oxygenation of the vitreous humour of the eye *in vivo*. http://www.bsms.ac.uk/research/our-researchers/nicholas-dowell/ Marcus Gray Senior Fellow Experimental Neuropsychology Research Unit School of Psychology and Psychiatry Faculty of Medicine Nursing & Health Sciences Building 17, Level 5 - Room 519 Monash University Clayton, VIC, 3800 Phone: +61 (0)3 9905 3245 email: [log in to unmask] On 18 August 2011 23:20, Bill Budd <[log in to unmask]> wrote: > Your SPM looks like it might be an auditory task? We sometimes see this in > a boxcar (rest-activation) fMRI design. I’ve always blamed sleepy subjects > who often close their eyes when no sounds are presented but open them when > sound is presented.**** > > ** ** > > Cheers**** > > -Bill**** > > ** ** > > *From:* SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] *On > Behalf Of *Steve Masson > *Sent:* Thursday, 18 August 2011 8:29 AM > > *To:* [log in to unmask] > *Subject:* [SPM] Activation in an eye**** > > ** ** > > Dear SPM users,**** > > ** ** > > I observe activation in an eye (see attachment). I have a limited > experience in fMRI data, so you're help will be really appreciated.**** > > ** ** > > Is it common?**** > > ** ** > > What is the possible cause?**** > > ** ** > > What can be done to avoid this?**** > > ** ** > > All thoughts and ideas will be welcomed!**** > > ** ** > > Regards,**** > > ** ** > > Steve**** > > ** ** > > **** > > ** ** >