[Eeglablist] eeglablist Digest, Vol 167, Issue 1

[Samran]

Hi,

One of the ways to import triggers is by telling EEGLAB which channel
contains the triggers/event markers, which can be done by File->Import
Event Info->From Data Channel. There you can input the channel index (65),
and whether you need the trigger transition to be low to high, high to low,
or both. For this, I think it'll be easier if you have your triggers named
differently e.g. T1, T2 and T3 for your 3 tasks.

However, it seems that you have used different voltage levels for different
triggers. Here I think what you can do is (1) replace voltage levels by T1,
T2 and T3 in the channel, and then import event info as mentioned above or
(2) get the channel in a variable, and find where the triggers are and use
that array in File->Import Event Info->From Matlab array or ASCII file.
Since, sometimes trigger lasts a few samples, it is better to have either
low to high transition, or high to low transition as the detection point of
the trigger.

I hope this helps.

Cheers.

Samran.


On Sat, Sep 1, 2018 at 9:00 PM <eeglablist-request at sccn.ucsd.edu> wrote:

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>    1. How to add Digital trigger as events? (Nayab Asif)
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> ---------- Forwarded message ----------
> From: Nayab Asif <nayabasif at yahoo.com>
> To: eeglablist at sccn.ucsd.edu
> Cc:
> Bcc:
> Date: Sat, 1 Sep 2018 01:37:05 +0000 (UTC)
> Subject: [Eeglablist] How to add Digital trigger as events?
> Hi everyone,
>
> I have 64 channel EEG data recorded for 3 different movements. I generated
> pulses of different heights using nidaq  as triggers at the 65th channel of
> my gtec EEG recorder.
>
> Now i am unable to import these triggers to mark the events. I tried to
> use add event info but it takes forever and doesn't work.
>
> I tried to add by using .mat file as well (Where i extracted the triggers
> by using peakdetection), but it has the latency problem.
>
>
> Can anyone guide me please how to add the events by using the triggers
> generated ta 65th channel.?
>
> BR.
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-- 
Regards,


M. Samran Navid.
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