[Eeglablist] about markers

[Lemya Kacha]

Dear Miyakoshi San,

Thank you very much for your reply.

So, as a beginner in EEGlab and EEG studies, what I have understood  from
your reply is that it is quite impossible to insert event markers if we
didn't define markers from the beginning. Right?

Actually, we want to avoid dividing the signal into small portions of 10
seconds each, each portion is related to a different stimulus. And then
reject the artifacts from each portion separately.
However, this will affect the timing between the stimuli and the signal
portions.

What we want ask is:
Is it possible to reject the artifacts without changing the time related to
each portion of the signal? (if we reject the artifacts, time or duration
of the signal will be reduced).



Thank you very much in advance

Kacha Lemya


On Tuesday, October 1, 2013, Makoto Miyakoshi wrote:

> Dear Lemya,
>
> Unless you have a completely synched event marker stream, most likely that
> can't be helped. If you do, of course you can insert new event markers.
>
> Makoto (nice to hear from Nagoya!)
>
>
>
>
> 2013/9/30 Lemya Kacha <lem84kachaman at gmail.com <javascript:_e({}, 'cvml',
> 'lem84kachaman at gmail.com');>>
>
>> Dear All,
>>
>> i did an experiment using Epoc Emotiv research edition by presenting 74
>> streetscape images to 20 subjects. The experiment was done in two sessions
>> with the same photos. The problem that I encountered now is that I didn't
>> insert the markers in all the experiments. when I want to filter the data
>> and reject the artifacts, i risk to have a problem of timing between the
>> presented pictures and their related signal that might not correspond
>> exactly to the flow of the images presented to subjects.
>>
>> my question is: Is there any solution to insert markers in this phase
>> (offline)?
>> Thank you in advance.
>>
>> Kacha Lemya
>> Nagoya Institute of Technology
>> Japan
>>
>>
>>
>>
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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