If you're still having problems after shifting to SPM8b, I'd be happy
to help since I was the one that wrote the I/O routines for the EGI
file formats. So far the current version has been working for folks.
Cheers!
Joe
On Dec 30, 2008, at 1:07 AM, Vladimir Litvak wrote:
> Dear Michael,
>
> If you are just getting started with SPM for EEG analysis we'd
> recommend you to use SPM8b. It has quite good support for EGI and it's
> the version we are presently interested to support. SPM5 for EEG works
> quite robustly on several data types for which it was developed and
> tested (primarily the data types used at the FIL), but it's quite a
> pain to get it working for an external user. This is not the case for
> SPM8b that was specifically developed to support multiple data types
> in a generic way.
>
> Best,
>
> Vladimir
>
>
> On Tue, Dec 30, 2008 at 2:59 AM, Michael Hagerty <[log in to unmask]
> > wrote:
>> I am having trouble converting my EEG data to SPM5 format. I have
>> EEG data
>> from a GeoSensor 256 array and I use the converter program supplied
>> with the
>> manual: meeg_read_data.m .
>>
>> It creates the .dat file and the .mat file with no problem, but
>> when I try
>> to use the GUI to Epoch the data, I get the error:
>>
>>
>>
>> ??? Reference to non-existent field 'time'.
>>
>>
>>
>> Error in ==> spm_eeg_epochs at 110
>>
>> D.events.time = D.events.time + round(Resynch*D.Radc/1000);
>>
>>
>>
>> ??? Error using ==> spm_eeg_epochs;
>>
>> Reference to non-existent field 'time'.
>>
>>
>>
>> ??? Error while evaluating uicontrol Callback
>>
>>
>>
>> The converter program does not create a variable D.events.time, but
>> the GUI
>> seems to require one. Even when I create the variable
>> D.events.time myself
>> as the difference D.events.stop – D.events.start, the GUI gives me
>> another
>> error:
>>
>>
>>
>> ??? Error using ==> spm_eeg_epochs;
>>
>> Error using ==> spm_eeg_epochs
>>
>> Start of pre-stimulus time must be less than -1.000000 ms
>>
>>
>>
>> Can someone help???
>>
>>
>>
>>
>>
>>
>>
>> Michael Hagerty, Professor Emeritus
>>
>> University of California, Davis http://faculty.gsm.ucdavis.edu/~mrhagert/
>>
>>
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