Hi,
On Wed, Nov 5, 2014 at 1:57 AM, cyril pernet <cyr...@ed...> wrote:
> Hi Amy
>
> you can find out how to compute properly your PSC here:
> http://journal.frontiersin.org/Journal/10.3389/fnins.2014.00001/full
> you can find matlab code in supplementary material to see concretely how to
> do it -- alternatively the MarsBaR toolbox can do that semi-automatically
>
> cyril
>
>
>> Dear All,
>>
>> I would like to calculate the % signal change from an ROI.
>> The parameters of my fmri block design is like this...
>> 6 blocks of active phase and 6 blocks of rest phase.
>> Each block comprised of 7 trials.TR= 4 sec
>>
>> How to calculate the event duration for getting the %signal change in that
>> particular ROI?
Which duration you choose will depend on the interpretation you want
to give to the value.
The ordinary thing to do here would be to choose the duration of the
block (in seconds). Then marsbar will generate a predicted
time-course for a block of this length, and calculate the percentage
signal change from that predicted time-course. This gives you the
estimated signal change for one block.
Best,
Matthew
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