[Eeglablist] problem when importing EDF file into EEGLAB - only loads the first 0.5 seconds

[Arnaud Delorme]

Dear Neal,

what happens if you leave the time range empty. It should import the whole file, no?
Best,

Arno

On Aug 3, 2012, at 2:34 AM, Neal Hinvest wrote:

> I am an EEGLAB novice and am having an issue when importing an EDF file 
> into EEGLAB. The original file is 2781 seconds long but when I load the 
> EDF file into EEGLAB it only loads the first 0.556 seconds.
> 
> When I import the file I specify that the data range in seconds [0 
> 2781]. I deselect "extract event" as I am going to import events using a 
> .txt file. I select "import continuous data" as data gathering was 
> continuous. When I click OK the correct number of channels is displayed, 
> Frames per epoch are 2781. But the epoch start and end are 0 and 0.556 
> respectively. When I load in my .txt file with my events the events in 
> the file are then outside the boundaries of the waveform file.
> 
> I receive the following errors when I import the EDF file:
> 
> Reading data file header...
> WARNING SOPEN(EDF): Physical Max/Min values of EDF data are not 
> necessarily defining the dynamic range.
>    Hence, OVERFLOWDETECTION might not work correctly. See also EEG2HIST 
> and read
>    http://dx.doi.org/10.1016/S1388-2457(99)00172-8 (A. Schlögl et al. 
> Quality Control ... Clin. Neurophysiol. 1999, Dec; 110(12): 2165 - 2170).
>    A copy is available here, too: 
> http://pub.ist.ac.at/~schloegl/publications/neurophys1999_2165.pdf
> Reading data in EDF format...
> Warning SREAD: NoS yields non-integer position [0.555800, 5000.000000]
> eeg_checkset note: upper time limit (xmax) adjusted so 
> (xmax-xmin)*srate+1 = number of frames
> Creating a new ALLEEG dataset 1
> Done.
> 
> The first warning I do not need to worry about taking on board what 
> others have posted but I am unsure as to what the second warning, which 
> appears to be the critical one, is referring to.
> 
> Any help would be greatly appreciated.
> 
> Thanks,
> 
> Neal Hinvest
> 
> -- 
> Dr Neal Hinvest
> Lecturer
> University of Bath
> Bath
> BA2 7AY
> United Kingdom
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