[Eeglablist] About stimulus presentation delay

[Renato Paredes Venero]

Dear Chao,

I suggest you read the following article: Hairston, W. D. (2012).
Accounting for timing drift and variability in contemporary
electroencepholography (EEG) systems (Aberdeen Proving Ground, MD: US Army
Research Laboratory) Report ARL-TR-5945.

The correction method the author employs may be useful for you.

Greetings,

Renato Paredes

2016-09-20 20:39 GMT-05:00 chao wang <hnchaowang at gmail.com>:

> Hi, everyone,
>
> We're recording EEG data and we use E-Prime to present stimuli. During
> recording, stimuli are presented to subjects via a projector. The projector
> induces a delay between stimulus presentation on E-Prime computer and in
> front of subjects. We measured this delay and found that the delay was not
> constant across trials but instead jitters within certain range around the
> average. I would like to know is there a typical range of the jitter that
> can be accepted in ERP experiments? And in this situation, what should I do
> to segment EEG data with respect to stimulus onset? I mean, use the average
> delay to determine the real instant of stimulus presentation, or any other
> ways exist? Forgive me if my words is not clear :)
>
> Thank you in advance!
>
> Chao
>
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