[Eeglablist] Event type changes when exporting from EGI .RAW to BDF

Ramon Martinez-Cancino nucleuscub at gmail.com
Mon May 19 19:51:25 PDT 2014


> On May 19, 2014, at 7:34 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
> Dear Ramon,
> Here is a data import issue. Could you take a look?
> Makoto
> 2014-05-18 15:28 GMT-07:00 Ana Laura Diez Martini <diezmartini at gmail.com>:
>> Hello!
>> I'm new both to EEGlab and Mathlab and I haven't been able to solve a problem.
>> I'm using an EGI system in my new experiment and I used BIOSEMI for
>> previous ones. My current output file is in .RAW format and I want to
>> use my old scripts written for BDF files (I used Fieldtrip) to analyse
>> this new data. The problem is, when I try to export it to BDF I get
>> these warnings:
>> Warning SOPEN (EDF-Write): relative scaling error is 2.636733e-05 (due
>> to roundoff in PhysMax/Min)
>> Warning SWRITE: 174 NaNs added to complete data block.
>> Then the name of the triggers (the event type) changes completely.
>> I don't know if this has anything to do with it but the trigger codes
>> in my program (using Presentation) had this format: 11, 12, 13, 14,
>> 15,21, 22...etc. However, Netstation codes them differently. For
>> example trigger "11" would come out as 3 different events: 1,2,8, or
>> "12" would be 4 and 8. So I have to use a piece of code to convert
>> them to one event summing up the others with the same latency. I also
>> tried exporting to BDF without this conversion and it won't work
>> either. In any case, I need to export it to have the new event types
>> saved.
>> Just to clarify, again what I need is to get a BDF file from a .RAW
>> file with the same events so I can use my old scripts. I'm sorry if
>> I'm missing a lot from my lack of knowledge, I have been reading but I
>> couldn't find anything to solve this.
>> PS: Please let me know if I can upload any of my files to help
>> understand my problem
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> -- 
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
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