[Mne_analysis] reading eeg part of eeg-fMRI data

[Jaakko Leppakangas]

The problem is probably that the event_offset becomes negative, which means
that the number of channels or the event offset is not read correctly from
the header. The cnt reader of MNE-python uses specs defined here
http://paulbourke.net/dataformats/eeg/. I've also come across cnt files
that don't really conform to those. Can you share the file? I could take a
look at some point.

On Tue, Aug 29, 2017 at 12:00 PM, Sammi Chekroud <sammi.r.chekroud at gmail.com
> wrote:

> oops, sorry, that was actually a typo on my part (emailing from laptop,
> code on a workstation). It's actually fid.seek, not seet... sorry about that
>
> On 29 August 2017 at 09:58, Sammi Chekroud <sammi.r.chekroud at gmail.com>
> wrote:
>
>> hey,
>>
>> thanks for the reply. I'm using the dev, but I haven't pulled in a while.
>> I'll give this a go and see whats going on
>>
>> Cheers,
>> Sammi
>>
>> On 29 August 2017 at 09:51, Jaakko Leppakangas <jaeilepp at gmail.com>
>> wrote:
>>
>>> Hi Sammi,
>>>
>>> which version of MNE are you using? Looks like your code has a weird
>>> typo that doesn't exist in the code base (https://github.com/mne-tools/
>>> mne-python/blob/maint/0.14/mne/io/cnt/cnt.py#L231).
>>>
>>> Maybe updating the version will fix it.
>>>
>>> -Jaakko
>>>
>>> On Tue, Aug 29, 2017 at 11:35 AM, Sammi Chekroud <
>>> sammi.r.chekroud at gmail.com> wrote:
>>>
>>>> Hi all,
>>>>
>>>> I'm trying to read in some EEG data collected from an eeg-fMRI task and
>>>> having a couple of problems.
>>>>
>>>> Firstly, we're acquiring data using Curry 8. I've converted the native
>>>> .cdt data into .cnt using their software, and it outputs a file_path.cnt
>>>> and file_path.cnt.dpa file together. Events are contained in the .cnt file
>>>> though as you can read this data into EEGlab without a problem and it
>>>> detects triggers.
>>>>
>>>> I'm trying to read it into MNE and I get the following error:
>>>>
>>>> File "/home/sammirc/mne-python/mne/io/cnt/cnt.py", line 231 in
>>>> _get_cnt_info
>>>> fid.seet(event_offset)
>>>>
>>>> IOError: [Errno 22] Invalid Argument
>>>>
>>>> not sure what this means? Is it not detecting events in the data, so
>>>> getting an error? The events are definitely there as two other people also
>>>> checking this data have been able to read it into matlab.
>>>>
>>>> I wondered if it could be because of the montage in use (easycap-M1)
>>>> when it could be inaccurate. I got the montage file (both .mnt and .xml)
>>>> and tried to create a montage ( mne.channels.read_montage ) but this also
>>>> doesnt work as neither format is supported...
>>>>
>>>> Any help on this would be pretty great as we're trying to check data
>>>> quality of a new system.
>>>>
>>>> Cheers,
>>>> Sammi
>>>>
>>>> _______________________________________________
>>>> Mne_analysis mailing list
>>>> Mne_analysis at nmr.mgh.harvard.edu
>>>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis
>>>>
>>>>
>>>> The information in this e-mail is intended only for the person to whom
>>>> it is
>>>> addressed. If you believe this e-mail was sent to you in error and the
>>>> e-mail
>>>> contains patient information, please contact the Partners Compliance
>>>> HelpLine at
>>>> http://www.partners.org/complianceline . If the e-mail was sent to you
>>>> in error
>>>> but does not contain patient information, please contact the sender and
>>>> properly
>>>> dispose of the e-mail.
>>>>
>>>>
>>>
>>> _______________________________________________
>>> Mne_analysis mailing list
>>> Mne_analysis at nmr.mgh.harvard.edu
>>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis
>>>
>>>
>>> The information in this e-mail is intended only for the person to whom
>>> it is
>>> addressed. If you believe this e-mail was sent to you in error and the
>>> e-mail
>>> contains patient information, please contact the Partners Compliance
>>> HelpLine at
>>> http://www.partners.org/complianceline . If the e-mail was sent to you
>>> in error
>>> but does not contain patient information, please contact the sender and
>>> properly
>>> dispose of the e-mail.
>>>
>>>
>>
>
> _______________________________________________
> Mne_analysis mailing list
> Mne_analysis at nmr.mgh.harvard.edu
> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis
>
>
> The information in this e-mail is intended only for the person to whom it
> is
> addressed. If you believe this e-mail was sent to you in error and the
> e-mail
> contains patient information, please contact the Partners Compliance
> HelpLine at
> http://www.partners.org/complianceline . If the e-mail was sent to you in
> error
> but does not contain patient information, please contact the sender and
> properly
> dispose of the e-mail.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20170829/1238e1c8/attachment-0001.html