[Eeglablist] extracting epochs between 2 adjacent events

shahar shahars10 at gmail.com
Thu May 15 02:26:00 PDT 2014


Yes,
This is the way by which I also decided to solve this problem.
Thank you


On Thu, May 15, 2014 at 2:11 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>wrote:

> Dear Shahar,
>
> It would be faster to build your own rather than modifying EEGLAB to be
> able to deal with variable epoch length... simple solution is to use set
> the epoch length to the longest epoch you have, and let other epochs
> redundant/meaninless at the end. I actually often do redundant epoch thing
> since our wavelet transform requires -1 to 2 seconds regardless of actual
> stimulus onset asynchrony to analyze down to 3 Hz.
>
> Makoto
>
>
> 2014-05-14 2:16 GMT-07:00 shahar <shahars10 at gmail.com>:
>
> Hi Stephen,
>> Thank you for your answer. The length of the epochs in our case is not
>> constant. Does anyone know if there is a way to specify eopchs having
>> variable length in EEGLAB ?
>>  Thank you
>>
>>
>>
>> On Wed, May 14, 2014 at 8:18 AM, Stephen Politzer-Ahles <spa268 at nyu.edu>wrote:
>>
>>> Hi Shahar,
>>>
>>> Would this result in variable length epochs? If so, I don't think EEGLAB
>>> can do that (last time I checked), but it would be possible in FieldTrip.
>>> If the epoch lengths wouldn't be variable (e.g., if you know that every
>>> backward_stop event is exactly 1 second after the preceding backward_start
>>> event) then I imagine you would be able to do this with the traditional
>>> method (extracting epochs based on just backward_start).
>>>
>>> Best,
>>> Steve
>>>
>>>
>>>
>>> Stephen Politzer-Ahles
>>> New York University, Abu Dhabi
>>> Neuroscience of Language Lab
>>> http://www.nyu.edu/projects/politzer-ahles/
>>>
>>>
>>> On Tue, May 13, 2014 at 11:40 PM, shahar <shahars10 at gmail.com> wrote:
>>>
>>>> Hello,
>>>> As I've seen, there is an option to extract epochs based upon a single
>>>> event, and in this case one can specify the start & end times of these
>>>> epochs, relatively to each single event.
>>>> I want to specify the epochs differently: I want to use a couple of
>>>> events to define a single epoch. for instance, if we look at a
>>>> patient going backwards, I want the epoch to start half a second before the
>>>> event "backward_start", and end half a second after the
>>>> next "backward_stop" event. Is it possible to specify epochs in this manner
>>>> and how ?
>>>> Thank you,
>>>>
>>>> Shahar
>>>>
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>>>
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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