MultiplotER using Neuromag lay

Christian Hesse c.hesse at FCDONDERS.RU.NL
Mon Mar 19 17:02:38 CET 2007

Hi Matt,

you can use the function PREPARE_LAYOUT to generate a layout using
the gradiometer information in your data.


On 19 Mar 2007, at 15:27, Shtrahman, Matthew wrote:

> Hi,
> Can someone give me the link where I can download NM306mag.lay?
> Thanks,
> Matt
> -----Original Message-----
> From: FieldTrip discussion list on behalf of Joachim Gross
> Sent: Mon 3/19/2007 5:38 AM
> Subject: Re: [FIELDTRIP] MultiplotER using Neuromag lay
> Hi Eve,
> I think I had a similar problem.
> In my case the channel labels in NM306mag.lay did not exactly match
> the
> labels in avgdata.label.
> After changing either set of labels it worked for me.
> Joachim
> alotof eve wrote:
>> Hi, Christian,
>>   Sorry I didn't reply this for a long time. Thanks for these
>> suggestions. They work well. And I found after using read_data, the
>> other processing still can work for whole data.
>>   However, I met another problem.
>>   After I did timelockanalysis, I tried to plot average data using
>> multiplotER. I downloaded the file "NM306mag.lay" and other two you
>> offered. The layoutplot(cfg) shows that the files are correct.
>> However, when I used multiplotER(cfg,avgdata), the figure showed up
>> was blank. Nothing on it even the lables.
>>    Could you or other experts tell me the possible way to figure it
>> out? Thanks so much.
>> Best,
>> Eve
>> */Christian Hesse <c.hesse at FCDONDERS.RU.NL>/* wrote:
>>     Hi Eve,
>>>     I can use meg-pd toolbox now. However, it seems all the
>>> functions
>>>     in FieldTrip are for evoked data while my raw data is continuous
>>>     data.
>>     FieldTrip handles a variety of data, and the low level reading
>>     functions can deal with continuous or epoch based raw data.
>>     When you analyze your data in FT, you usually start by defining
>>     your trials, i.e. epochs in your continuous data that are of
>>     interest, w.r.t. to some sort of trigger or event. The function
>>     PREPROCESSING then scans through your raw data file and returns a
>>     data structure which contains all of the specified epochs (for a
>>     particular trial definition) in a field data.trial. Please note
>>     that this has nothing to do with evoked vs induced responses
>> just yet.
>>     You can use the output of PREPROCESSING as input to either
>>     TIMELOCKANALYSIS or FREQUANALYSIS which look at evoked and
>> induced
>>     phenomena, respectively. Afterwards you can call various
>>     statistical functions such as FREQDESCRIPTIVES, etc ...
>>     So the reason why I have been giving you the examples using
>>     read_header and read_data is because I needed to determine the
>>     nature of the error you were getting without really knowning
>>     anything about what sort of data is in your file. In your use of
>>     FT you do not actually use these functions yourself, but
>> basically
>>     use functions like DEFINE_TRIAL and PREPROCESSING to start with.
>> ---------------------------------------------------------------------
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Christian Hesse, PhD, MIEEE

F.C. Donders Centre for Cognitive Neuroimaging
P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

Tel.: +31 (0)24 36 68293
Fax: +31 (0)24 36 10989

Email: c.hesse at

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