I'd actually love to get the same set of instructions if anyone was
planning on replying to Nathan directly.
Thanks, Matt
Begin forwarded message:
> From: Nathan Klimenko <[log in to unmask]>
> Date: March 29, 2005 10:11:33 AM PST
> To: [log in to unmask]
> Subject: [SPM] subtraction analysis
> Reply-To: Nathan Klimenko <[log in to unmask]>
>
> Dear List,
>
> I would like to do a simple subtraction analysis using the spatially
> normalized images from two groups.
>
> Using Imcalc, I got the average-images of the two groups and
> substracted
> them to get the activation/deactivation images. Would you mind showing
> me
> how to do the following with Imcalc?
>
> 1)select a threshold for masking and exclude all voxels below that
> threshold.
>
> 2)Calculate the variance across all voxels and divide the masked
> activation/deactivation image by the variance.
>
> 3)Exclude areas with unusually high variance.
>
> Thank you,
>
> Nathan Klimenko
>
>
>
"The more the universe seems comprehensible, the more it also seems
pointless." Steven Weinberg (1977) The First Three Minutes.
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