[Eeglablist] Changing event markers in dataset

[Makoto Miyakoshi]

Dear Edwige,

> I am wondering whether I can change the other triggers so that they are
distinguishable too. In this way, I can compare, for example, the target
words in one particular condition with each other because they would have
different event markers. For instance, in the active condition, the target
word is marked with 17 in the prime sentence as well as in the target
sentence, I am not sure if Matlab would be able to distinguish them (I
assume not).

I did not understand your question here. However,

> Does anyone know how I can change event markers in my dataset?

You can swap existing event marker types with other ones, if that solves
your problem. See this page. Note that this coding is done outside EEGLAB
so be careful.
https://sccn.ucsd.edu/wiki/Makoto%27s_useful_EEGLAB_code#Event_types

If you want to do it more intuitively, you may want to consider exporting
the existing event structure to Microsoft Excel (or equivalent) and modify
it visually and manually. Then re-import the event file.

Makoto


On Sun, Jul 15, 2018 at 9:08 PM E. Sijyeniyo <e.sijyeniyo at student.rug.nl>
wrote:

> Dear EEGlab users,
>
> I have a question regarding changing event markers in my dataset.
>
> Initially, I recorded my data with the following markers:
>
> Active condition:
> Prime sentence: 40, 9, 13, 17, 21, 25, 29
> Target sentence: 45, 9, 13, 17, 21, 25, 29
>
>
> Passive condition
> Prime sentence: 40, 8, 12, 16, 20, 24, 30
> Target sentence: 45, 8, 12, 16, 20, 24, 30
>
>
> However, only the first trigger distinguishes both sentences, so only 40
> and 45. I am wondering whether I can change the other triggers so that they
> are distinguishable too. In this way, I can compare, for example, the
> target words in one particular condition with each other because they would
> have different event markers. For instance, in the active condition, the
> target word is marked with 17 in the prime sentence as well as in the
> target sentence, I am not sure if Matlab would be able to distinguish them
> (I assume not).
>
> So I would want to change them into something like:
>
> Active condition:
> Prime sentence: 40, 9, 13, 17, 21, 25, 29
> Target sentence: 45, 23, 33, 43, 53, 63, 73
>
> Passive condition:
> Prime sentence: 55, 8, 12, 16, 20, 24, 30
> Target sentence: 60, 26, 36, 46, 56, 66, 76
>
> Does anyone know how I can change event markers in my dataset?
>
> Thank you so much for anyone who responds!
>
> Best
> Edwige
> P.s As I am a master student, this is my first ever EEG study and during
> the design of my experiment these differences between triggers coding did
> not occur to me...
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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