RE: [Marsbar-users] extract fMRI data

[Chi-Hua C. <ch...@ca...>]

Hi

Thank you very much for your reply. Sorry I didn't mention clearly that
whole analysis was processed under the SPM99, so I guess the problem of
different orientation shouldn't be the case here.

I used the old version of MarsBar again with the graphical user
interface, and the result was still slightly different from that of the
new version. However, if I choose 'No' for 'Filter data' option (which
is not available in the new MarsBar), then I got the same results as
those from the batch and GUI of the new version of MarsBar.

What is your advice? Should I use the filter or not? What is the effect
of filter on data?

Also, the program uses SPM.mat to extract time course. I had already
applied the high-pass filter to get each participants' SPM.mat when
estimate the model in spm99. So do I need to apply filter again in MarsBar?

If filtering is recommended, how to enable the filtering in the batch
script?

Thanks,

Chi-Hua

-----Original Message-----
From: Matthew Brett [mailto:mat...@uc...]
Sent: 25 May 2004 18:12
To: Chi-Hua Chen
Cc: marsbar
Subject: RE: [Marsbar-users] extract fMRI data


On Tue, 2004-05-25 at 08:37, Chi-Hua Chen wrote:
> Thank you very much for your reply. Now I can use the code you sent to me
> before to extract data. However, I feel confused about the results,
because
> the mean values are a bit different from those I got from old version of
> MarsBar. Can you tell me how is this possible? Which one I should trust??

That is very strange.  One possibility is that you are using SPM2 now,
when previously you were using SPM99, and the images have been
automatically flipped in SPM2, as is the default, so you are looking at
values from the opposite side of the brain.  If not, maybe you could try
extracting the data again with the old version of MarsBaR to confirm the
two are different - as I would not expect that.

Best,

Matthew