Dear Andre,
There are several things you can do:
1) The simplest thing is to export your data with triggers recorded
from BV Analyzer to binary BV format and then convert it to SPM.
2) If from the raw Biosemi data you get triggers with the right timing
and just their codes are wrong and you know the correct sequence of
codes you can recode them using the SPM reviewing tool. This is
described in the SPM manual, section 37.4.5 (p. 373).
3) Finally you can write some Matlab code that will do what your BVA
macro does, but for that you need some knowledge of Matlab and
familiarity with SPM format. I can help you if the other two ways
don't work well enough or you.
Best,
Vladimir
On Fri, Oct 22, 2010 at 2:53 PM, André Schmidt <[log in to unmask]> wrote:
> Dear Vladimir
>
> Thanks for your help.
>
> I have a further question concerning pre-processing, especially epoching.
>
> We have applied the roving oddball paradigm (Garrido et al. 2008) using the
> ActiveTwo system (Biosemi, The Netherlands) with 64 scalp electrodes (10–20
> system) to measure the MMN memory trace effect. In this auditory paradigm,
> tones were presented within a stimulus train of one frequency and were
> followed by a train of a different frequency. The number of times the same
> tone was presented varied pseudo-randomly between one and eleven.
> Thus, we have put temporal markers for all 11 tones for epoching. This was
> achieved by only 4 markers and combination of these. In others words:
>
> S1: tone 1 S2: tone 2 S1+S2: tone
> 3 S3: tone 4
> S1+S3: tone 5 S2+S3: tone 6 S1+S2+S3: tone 7
> S4: tone8
> S1+S4: tone 9 S2+S4: tone 10 S1+S2+S4: tone 11
>
> For the classical EEG analysis with BrainVision Analyzer software, we
> utilized a macro (mergeBitMarkers) to assign the markers to the
> corresponding tone number:
>
> Before mergeBitMarkers:
>
> S1: 1005
> S2: 935
> S3: 793
> S4: 339
>
> After mergeBitMarkers:
>
> S1: 250
> S2: 244
> S3: 240
> S4: 232
> S5: 216
> S6: 187
> S7: 157
> S8: 128
> S9: 104
> S10: 69
> S11: 37
>
> Now we like to analysis the EEG also with SPM8 to model sources and
> connectivity. My question is if there is a similar macro like in the
> analyzer software to decode our temporal markers? How can I solve this
> problem within SPM?
>
> Best,
> andré
>
> -----Ursprüngliche Nachricht-----
> Von: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] Im
> Auftrag von Vladimir Litvak
> Gesendet: Freitag, 22. Oktober 2010 12:35
> An: [log in to unmask]
> Betreff: [SPM]
>
> Dear Andre,
>
> Signal Processing toolbox is an optional add-on to Matlab. If you
> don't have it then it means that your institution hasn't purchased it.
> However, if you use the latest SPM8 release (4010) there should be no
> need in Signal Processing toolbox for M/EEG preprocessing.
>
> Best,
>
> Vladimir
>
> On Fri, Oct 22, 2010 at 10:53 AM, André Schmidt
> <[log in to unmask]> wrote:
>> Dear all
>>
>>
>>
>> I have a really basic problem. Where can I find the signal processing
>> toolbox for EEG pre-processing?
>>
>>
>>
>> Thanks for help
>>
>> andré
>
>
|