[Eeglablist] extracting epochs between 2 adjacent events

[Makoto Miyakoshi]

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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