query on loading CNT files

Muthuraman Muthuraman muthuraman10 at HOTMAIL.COM
Tue Jan 24 11:46:57 CET 2006


I am beginner with field trip
as in the previous mail i have asked about the query on loading CNT files
and according to the reply i need to call the function DEFINETRAIL
in the function DEFINETRAIL i have to use the READ_FCDC_EVENT to find the
events in the data
which gave warnings

i have attached in the mail what were exactly the steps carried out for the
EEG analysis

'pd_mof_tr0_o_0307.cnt' is the file which contains the data

>>[hdr] = read_fcdc_header(headerfile);
Loading file pd_mof_tr0_o_0307.cnt ...

hdr =

             Fs: 1000
         nChans: 64
       nSamples: 172040
    nSamplesPre: 0
        nTrials: 1
          label: {1x64 cell}

>>[dat] = read_fcdc_data(datafile, hdr, begsample, endsample, chanindx,
Loading file pd_mof_tr0_o_0307.cnt ...
>>[event] = read_fcdc_event(filename)
Warning: handling of event structure has not been fully tested for Neuroscan
*.cnt files
>In C:\muthu\work\fieldtrip-20060118\read_fcdc_event.m at line 414
Loading file pd_mof_tr0_o_0307.cnt ...
Warning: no events found in pd_mof_tr0_o_0307.cnt
>In C:\muthu\work\fieldtrip-20060118\read_fcdc_event.m at line 620

event =


Thanking you
with regards

>From: Robert Oostenveld <r.oostenveld at FCDONDERS.RU.NL>
>Reply-To: FieldTrip discussion list <FIELDTRIP at NIC.SURFNET.NL>
>Subject: Re: [FIELDTRIP] query on loading CNT files
>Date: Wed, 18 Jan 2006 21:20:37 +0100
>Dear Muthuraman
>All analyses start by calling the PREPROCESSING function, which reads  the
>data segments of interest into memory. Prior to that, you should  call
>DEFINETRIAL to determine the data segments of interest (usually  based on
>the triggers present in the datafile). Please see the help  of those two
>functions (type "help function_name" on the matlab  command line) or look
>at http://www2.ru.nl/fcdonders/fieldtrip/ reference.html
>best regards
>On 18-jan-2006, at 11:44, Muthuraman Muthuraman wrote:
>>I would like to use fieldtrip to analyse EEG recordings
>>how to load CNT files which contains the data
>>how can i load the data and do the analysis
>>with regards
>Robert Oostenveld, PhD
>F.C. Donders Centre for Cognitive Neuroimaging
>Radboud University Nijmegen
>phone: +31-24-3619695

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