Hi Doug,
Sorry to interrupt you again with this topic. Don't you think, to
regress out my unwanted event (eletric shock), I need to convolv this event
with the hrf model and then use the outcome as my regressor?
Regards
On Fri, May 1, 2015 at 12:23 PM, Douglas Greve <gr...@nmr.mgh.harvard.edu>
wrote:
> I don't necessarily think the exclude file is a better approach. What you
> are doing is probably fine.
> doug
>
> On 5/1/15 12:12 PM, sha...@nmr.mgh.harvard.edu wrote:
>
>> Hi Doug,
>> The reason that we did not use that 'exclusion method' was that, we
>> were not sure if the effect of shock is limited to that specific TR.
>> Actually, like other stimuli/events, we expected shock effect to appear
>> slightly (1-2 TRs) later. In this case, don't you think using a
>> regressor is a safer approach?
>> To clarify, I am very open to your suggestions if you have a better
>> idea or if you still think that exclusion is a better approach.
>>
>>
>>
>>
>> That will do what you want if you expect the shock to have the same
>>> response to each application. Alternatively, you can set up a time point
>>> exclude file to exclude those time points. If you use this, then create
>>> the file by putting the time in seconds of the time points you want to
>>> exclude.
>>> doug
>>>
>>> On 5/1/15 11:45 AM, SHAHIN NASR wrote:
>>>
>>>> Hi Surfers
>>>> I want to remove the possible effects of a binary noise (electric
>>>> shock) from the evoked fMRI. To do so, I have generated a regressor
>>>> file in which all TRs in which electric shock has been applied are
>>>> marked as 1 and the rest of TRs are 0. I just want to be sure that,
>>>> this is all I need to do for the regressor!
>>>> A sample regressor file is attached. It has 98 rows corresponding
>>>> to 98 TRs that we have in the experiment!
>>>>
>>>> Regards
>>>>
>>>> --
>>>> Shahin Nasr
>>>>
>>>> PhD in Cognitive Neuroscience
>>>> Martinos Imaging Center, MGH
>>>> Harvard Medical School
>>>>
>>>>
>>>
>>>
>>
>
>
--
Shahin Nasr
PhD in Cognitive Neuroscience
Martinos Imaging Center, MGH
Harvard Medical School
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