[Mne_analysis] reading eeg part of eeg-fMRI data

[Sammi Chekroud]

It's probably that the montage it's reading is wrong - there are some
different names in this eeg-fMRI setup (e.g. electrodes called CB1). That
said, wrote some code to convert the cdt file into .set in eeglab, then
read that into mne - I don't have any problems reading the data that way
now, so not sure what's going on

On 29 August 2017 at 10:29, Jaakko Leppakangas <jaeilepp at gmail.com> wrote:

> 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
>>>>>
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