Hi,
> A colleague of mine and myself are trying to overlay two functional
> activation maps (from different designs) onto a structural image but would
> like to preserve information about where those two maps overlap. We use
> display_slices (5/9/03 V0.4, SPM2).
>
> As far as we can see, when selecting more than one 'blob' image, the latter
> will be displayed 'on top' of the previous, i.e. blobs overwrite 'previous'
> blobs (usually, we display one using the hot, the other the winter color
> map).
That's right - the blob images override anything previously at the
relevant voxels, as do some of the SPM displays. If you wanted the
mixing effect, you should use the 'truecolor' option (or 'truecolour'
option - I can't remember if I was in a British phase that day). Then
you can choose (for example) 'red' for one blob image, and 'green' for
another, and get yellow where they mix.
By the way, the slice display option is actually in the SPM5 release,
but very well hidden. Try
>> so = slover('basic_ui')
at the matlab command line, to get a newer version of the the
display_slices routine. You can then manipulate the 'so' object
directly, and redisplay - e.g.
so = slover('basic_ui')
followed by
so.slices = [-2:10:52];
so = paint(so);
to change and redisplay. See:
[log in to unmask]" target="_blank">http:[log in to unmask]
and
[log in to unmask]" target="_blank">http:[log in to unmask]
for some documentation,
Best,
Matthew
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