Hi,
If you are trying to use cutoffcalc, don't just
turn the highpass filtering off for each EV, as it
can be a little time consuming - especially as you
then have to turn it back on after you've run
cutoffcalc. Given that the GUI resets the 0 value
to 1 when you do other things, it is better to just
choose a very large value, save the design, run
cutoffcalc and then change this value to that
specified by cutoffcalc. So choose something
very large (e.g. 9999) and it will be equivalent
to doing no filtering to the saved design, which
is what cutoffcalc needs.
Hope this is clear.
All the best,
Mark
On 12 May 2010, at 09:52, Stephen Smith wrote:
> Hi - this is just because the GUI has the minimum allowed set to 1s
> - if you want to turn off highpass filtering then you can do that
> elsewhere in the GUI (under pre-stats and in GLM model setup).
> Cheers.
>
>
> On 11 May 2010, at 15:46, Benny Liberg wrote:
>
>> Hi,
>>
>> I have noticed that when the cutoff value is set to 0 it
>> automatically jumps back to 1.0 when other parameters are changed
>> or when the file is saved. Is this fine?
>>
>> Regards,
>> Benny
>>
>> 2010/5/3 Mark Jenkinson <[log in to unmask]>
>> Hi,
>>
>> If you set your high-pass filter initially to zero, then save the
>> design
>> and then run "cutoffcalc" on the *.mat file, it will calculate the
>> best
>> highpass filter cutoff value for you. Note that you will also need
>> to
>> explicitly set the TR value in the cutoffcalc command if it is not
>> 3.0
>> seconds (e.g. use --tr=2.0 for a TR of 2 seconds).
>>
>> All the best,
>> Mark
>>
>>
>>
>> On 3 May 2010, at 09:51, Gabor Perlaki wrote:
>>
>> Hi all,
>>
>> I have an experiment with 5min baseline, 2min active1, 2min
>> baseline, 2min active2, 2min baseline, 2min active3 and 2min
>> baseline. Active1, Active2 and Active3 are different stimuluses. I
>> know that it is a very strange design, but because of some reason
>> we can not repeat the active parts. I've read some suggestions for
>> high-pass filter in case of simple block design, but I don't know
>> which is the best choice for this experiment.
>>
>>
>> Thanks a lot,
>> Gabor
>>
>>
>
>
> ---------------------------------------------------------------------------
> 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
> ---------------------------------------------------------------------------
>
>
>
|