[Eeglablist] ERP based on mulitple triggers

Xianghong xianghong at hmri.org
Thu Sep 25 08:40:03 PDT 2014


Dear Xiaonan:

Thank you so much, it worked! :)

I want to extract epochs based on trigger 1 (stimulation onset) and trigger 2 (correct response), how should I do this in ERPLAB? I found this menu item EEGLAB v13.3.2/ERPLAB/Extract bin-based epochs, when I try to use this function, seems it is not working or gives error, what could I do?
Thank you for help,
Best,

Xianghong



________________________________________
From: Xiaonan L. Liu [liuxiaonan87 at gmail.com]
Sent: Wednesday, September 24, 2014 8:43 PM
To: Xianghong
Subject: Re: [Eeglablist] ERP based on mulitple triggers

You need to add erplab into your matlab path in addition to put it in eeglab folder.

On Wednesday, September 24, 2014, Xianghong <xianghong at hmri.org<mailto:xianghong at hmri.org>> wrote:
Hi, Steve:

Thank you so much for the information, that is very helpful.
I am trying to download the new version of ERPLAB and unzip it into EEGLAB plugin. However, when I open EEGLAB in the matlab, I could not see the ERPLAB on the EEGLAB menu. Do you know what should I do?
Thank you,
Best regards,

Xianghong




________________________________________
From: politzerahless at gmail.com<javascript:;> [politzerahless at gmail.com<javascript:;>] On Behalf Of Stephen Politzer-Ahles [spa268 at nyu.edu<javascript:;>]
Sent: Tuesday, September 23, 2014 10:16 AM
To: Xianghong
Cc: Ramón Martinez; eeglablist at sccn.ucsd.edu<javascript:;>
Subject: Re: [Eeglablist] ERP based on mulitple triggers

Hi Xianghong,

The EEG.event or EEG.epoch structures have the triggers, and you can use this modify triggers based on neighboring events. For example, if you want to find all instances of trigger 1 that are immediately followed by trigger 2, you can write a loop in MATLAB that compares EEG.event(n) to EEG.event(n+1) and rewrites the appropriate events (for example, converts those 1s into 12s); it's hard to say more without knowing specifically what you want to do, but there are earlier messages on this mailing list with sample code for doing things like this.

Alternatively, if you don't want to do it in MATLAB code, I believe the ERPLAB plugin has a lot of options for advanced trial selection like this.

Best,
Steve



Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab
http://www.nyu.edu/projects/politzer-ahles/

On Tue, Sep 23, 2014 at 1:55 AM, Xianghong <xianghong at hmri.org<javascript:;><mailto:xianghong at hmri.org<javascript:;>>> wrote:
Hi,

I want to analyze the ERPs based on trigger 1, as well as other triggers (such as trigger 2 for correct responses only). How could I do that?
Thanks,
Best,

Xianghong
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