[Eeglablist] Data reduction after extracting epochs

[Makoto Miyakoshi]

Dear Mastaneh,

Please check if you by any chance confused time units (seconds vs.
datapoints).

Makoto


2013/7/13 Mastaneh Torkamani <mastaneht.83 at gmail.com>

>
> Dear all,
>
> I have a number of EDF files which contain recordings from an epithetic
> patient. As the IPS and HV events were not correctly saved in those files,
> I added the event information to a text file and wrote a script to load all
> the fields into the EEG structure. I followed instructions in this link
> http://sccn.ucsd.edu/wiki/Chapter_03:_Event_Processing and believe the
> event fields and values are similar to the example data sets and match.
> However, when I extract epochs, the data length is considerably decreased
> and all the events seem to overlap with each other. Therefore, I cannot get
> any ERP plots and receive the following info :
>
> Removing 20 trials with NaN sortvar values.
> Setting variable avewidth to max 2.
> Sorting data on input sortvar.
> 100.00% of the trials (i.e., 2 out of 2) have the same sortvar value as at
> least one other trial.
> Distribution of number ties per unique value of sortvar:
> Min: 2, 25th ptile: 2, Median: 2, 75th ptile: 2, Max: 2
> Smoothing the sorted epochs with a 2-epoch moving window.
>   and a decimation factor of 1
>
> So, what should I do to define the trials and epoch lengths correctly?
>
> Any help is greatly appreciated.
>
> Best,
> Mastaneh
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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