The approach that I described tells you where the two sessions
activate on average. If you want to ask the slightly different
question "where do they BOTH activate in their own right" then just
take the intersection of their two activation maps carried out in
isolation.
Cheers.
On 8 Apr 2007, at 21:18, Gonzalo Rojas wrote:
> Hi:
>
> Thank you very much for your answer...
>
> And, How can I get the activation areas thar are common to both
> first-
> level analysys ?...
>
> Sincerely,
>
>
> Gonzalo Rojas Costa
>
>
> On Sun, 8 Apr 2007 07:47:29 +0100, Steve Smith <[log in to unmask]>
> wrote:
>
>> Hi - you can combine two runs with a fixed-effects second-level
>> analysis. The design should be a single EV with "1" for both
>> timepoints, the contrast should be [1] and you should select the
>> Fixed Effects model instead of Mixed Effects.
>>
>> Cheers.
>>
>>
>>
>> On 8 Apr 2007, at 01:43, Gonzalo Rojas wrote:
>>
>>> Hi:
>>>
>>> I have the first-level analysis of two different fMRI studies of
>>> the same patient... How can I do a higher level analysis to get the
>>> difference between the first-level analysis ?... I read the
>>> documentation of FSL, but I couldn't understand very well how can I
>>> do such higher-level analysis...
>>>
>>> Sincerely,
>>>
>>>
>>> Gonzalo Rojas Costa
>>>
>>>
>>> --
>>> Gonzalo Rojas Costa
>>> Laboratory of Medical Image Processing
>>> Department of Neuroradiology
>>> Institute of Neurosurgery Dr. Asenjo
>>> Jose Manuel Infante 553, Providencia, Santiago, Chile.
>>> Tel/Fax: 56-2-2003290
>>> Cel: 56-9-7771785
>>> www.neurorradiologia.cl
>>
>>
>> ---------------------------------------------------------------------
>> ---
>> ---
>> Stephen M. Smith, Professor of Biomedical Engineering
>> Associate Director, Oxford University FMRIB Centre
>>
>> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
>> +44 (0) 1865 222726 (fax 222717)
>> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>> ---------------------------------------------------------------------
>> ---
>> ---
------------------------------------------------------------------------
---
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
------------------------------------------------------------------------
---
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