[Eeglablist] How to convert continuous data to epoched data?

Chung-yeon Lee jamixlee at gmail.com
Sat Sep 28 02:23:32 PDT 2013


Dear. Stephen Politzer-Ahles,

Thank you very much!
I found their was a problem in the event value and solved it all.
What I did is eliminating all event values and rewrite, and extracting
epochs again.
Hope to be helpful for anybody who struggling with same problem.

Best wishes,

Chung-Yeon Lee


2013/9/28 Stephen Politzer-Ahles <politzerahless at gmail.com>

> Hi Chung-yeon,
>
> Are you sure? If it works correctly, EEG.data should be a
> three-dimensional data structure (number of channels x number of samples x
> number of trials)--you can check this by typing size(EEG.data) or
> ndims(EEG.data)at the command line.
>
> Once you've epoched, EEG.pnts, EEG.xmin, EEG.xmax, and EEG.times (and any
> other time-related fields that I might be forgetting) will be reflecting
> the time (or points) in one epoch, not the time (or points) in the whole
> dataset. Which might be why your data look like it's just 3 seconds.
>
> If it didn't work this way, we might need more information about the
> nature of your event markers, and how you ran Extract Epochs, to figure out
> what the problem is. My first guess would be there, if you have 20
> different event markers (instead of 20 repetitions of the same marker), you
> may have selected just one event type instead of all of them; or even if
> it's 20 of the same marker, you may have only selected the first event.
>
> Best,
> Steve
>
>
>
> Stephen Politzer-Ahles
> New York University, Abu Dhabi
> Neuroscience of Language Lab
> http://www.nyu.edu/projects/politzer-ahles/
>
>
> On Sat, Sep 28, 2013 at 3:54 AM, Chung-yeon Lee <jamixlee at gmail.com>wrote:
>
>> Extract Epochs (pop_epochs) makes the data has 3 seconds length.
>> Is this right result?
>> But I want 20trials(epochs) x 3sec(-1~2) data.
>>  2013. 9. 28. 오전 4:52에 "Stephen Politzer-Ahles" <politzerahless at gmail.com>님이
>> 작성:
>>
>>  Hello Chung-Yeon
>>>
>>> From the GUI you can select Tools > Extract Epochs -- see
>>> http://sccn.ucsd.edu/wiki/Chapter_05:_Extracting_Data_Epochs.
>>>
>>> Best,
>>> Steve
>>>
>>>
>>>
>>> Stephen Politzer-Ahles
>>> New York University, Abu Dhabi
>>> Neuroscience of Language Lab
>>> http://www.nyu.edu/projects/politzer-ahles/
>>>
>>>
>>> On Fri, Sep 27, 2013 at 11:14 AM, Chung-yeon Lee <jamixlee at gmail.com>wrote:
>>>
>>>> I have continuous EEG data with 20 event markers.
>>>> How to convert this data to epoched data with latency from -1 to 2?
>>>> I found other epoched data has 3 dimensional data structure in
>>>> 'EEG.data'.
>>>> However mine is 2 dimensional data.
>>>> Please anybody help me to solve this problem.
>>>> Thank you!
>>>>
>>>> --
>>>> *Chung-Yeon Lee
>>>> *Biointelligence Laboratory
>>>> Seoul National University
>>>> +82-10-7510-7150
>>>> http://bi.snu.ac.kr/~cylee
>>>>
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>>>
>>>
>


-- 
*Chung-Yeon Lee
*Biointelligence Laboratory
Seoul National University
+82-10-7510-7150
http://bi.snu.ac.kr/~cylee
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