[Freesurfer] Comparing HRF undershoots between conditions

2013-04-10 Thread SHAHIN NASR
Hi,
 I want to generate a map to show the significant difference between
HRF undershoot  (negative peak of activity) between two conditions
independent from the positive peak. Is there anyway, to generate this map?

P.S.: Please note that I need a map and not a time course graph.


-- 
Shahin Nasr

PhD in Cognitive Neuroscience
Martinos Imaging Center, MGH
Harvard Medical School
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Re: [Freesurfer] Comparing HRF undershoots between conditions

2013-04-10 Thread Douglas N Greve
Hi Shahin, there are several ways that you could do it. The one that 
immediately comes to mind is to use an FIR and then test for a 
difference at a particular post stimulus time point.
doug



On 04/10/2013 03:54 PM, SHAHIN NASR wrote:
 Hi,
  I want to generate a map to show the significant difference 
 between HRF undershoot  (negative peak of activity) between two 
 conditions independent from the positive peak. Is there anyway, to 
 generate this map?

 P.S.: Please note that I need a map and not a time course graph.


 -- 
 Shahin Nasr

 PhD in Cognitive Neuroscience
 Martinos Imaging Center, MGH
 Harvard Medical School

-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html
Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

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Re: [Freesurfer] Comparing HRF undershoots between conditions

2013-04-10 Thread Douglas N Greve

If you run tkmedit-sess, then open the overlay configuration window, 
then advance the time point to the delay you want. Otherwise, you can 
create a contrast where you just look at the delay you want. To do this, 
run mkcontrast-sess with -setwdelays and specify 0 for all delays and 1 
for the delay you want to see.

doug


On 04/10/2013 04:15 PM, SHAHIN NASR wrote:
 That's the problem Doug. I have already generated the FIR model but 
 how can I show the sig MAP for one particulat time point.  What are 
 the other ways?


 On Wed, Apr 10, 2013 at 4:05 PM, Douglas N Greve 
 gr...@nmr.mgh.harvard.edu mailto:gr...@nmr.mgh.harvard.edu wrote:

 Hi Shahin, there are several ways that you could do it. The one
 that immediately comes to mind is to use an FIR and then test for
 a difference at a particular post stimulus time point.
 doug




 On 04/10/2013 03:54 PM, SHAHIN NASR wrote:

 Hi,
  I want to generate a map to show the significant
 difference between HRF undershoot  (negative peak of activity)
 between two conditions independent from the positive peak. Is
 there anyway, to generate this map?

 P.S.: Please note that I need a map and not a time course graph.


 -- 
 Shahin Nasr

 PhD in Cognitive Neuroscience
 Martinos Imaging Center, MGH
 Harvard Medical School


 -- 
 Douglas N. Greve, Ph.D.
 MGH-NMR Center
 gr...@nmr.mgh.harvard.edu mailto:gr...@nmr.mgh.harvard.edu
 Phone Number: 617-724-2358 tel:617-724-2358
 Fax: 617-726-7422 tel:617-726-7422

 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
 http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
 FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html
 http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html
 Outgoing:
 ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/





 -- 
 Shahin Nasr

 PhD in Cognitive Neuroscience
 Martinos Imaging Center, MGH
 Harvard Medical School

-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html
Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

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