Also - did you adjust the experimental protocol to account for the HRF delay?

On Tue, Jun 16, 2015 at 12:35 PM, John Ashburner <[log in to unmask]> wrote:
Did you remove the first few fMRI scans from the time series prior to running the statistical tests?  The contrast in these is likely to differ, particularly in the ventricles and other CSF spaces.

Best regards,

On 16 June 2015 at 09:01, Andy Yeung <[log in to unmask]> wrote:
Dear all,

I am currently checking the activation result from one of the pilot study.
I found that there are some unexpected activations (which are two large area) on the white matter and ventricle (see the photo attached). At the same time there is not any activation on the area interested.

I know breathing may cause activation on ventricle but I am not sure why the activation is extended to the white matter. Or is there any other possible reason? And most importantly, is there any means to remove their effect?

Thanks and looking forward to your opinion.

Best regards,

Sharon Gilaie-Dotan, PhD

UCL Institute of Cognitive Neuroscience 
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Frontiers Research Topic on Visual motion perception and its neural correlates: