Dear Mark,
Choosing a higher threshold is more conservative (in that the resulting mask is smaller). Something like 0.9 would mean that voxels were only included in the mask that had at least 90% overlap with voxels in the original mask.
All the best,
Mark
On 15 Jan 2014, at 11:26, Mark Olivetti <[log in to unmask]> wrote:
> Thanks for the reply!!
>
> However, at what level should I threshold the native space seeds for having minimum contamination. Should I set the threshold at the maximum or is a threshold of 0.5 sufficient? The problem is that a visual inspection of the seeds in native space to assess the level of contamination from nearby voxels is rather difficult, given the difference in voxel size between MNI and native space images.
>
> Any assistance would be greatly appreciated.
>
> All the best,
> Mark
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