Eprime triggers to EEG out of sync

[Ryan Blything]

Hi everyone,

I came across this post because I am going to be trying a similar thing in 
my experiment such that we will be using e-prime v.1 to present audio 
stimuli and we are interested in setting markers so that they are not just 
at the onset of stimuli - but also at a number of specific points in each 
sentence (e.g. onset of the verb, noun, preposition). This would require 
having several markers for each trial and Im wondering about the best way 
to go about this? One way is through code but no one seems to have managed 
to do this successfully that Im aware of. How did it go for any of you? Im 
quite new to e-prime and SPM (which we will use to analyse data) so I would 
appreciate any advice before I continue.

An alternative option Ive heard about is post-hoc labelling, which would be 
done in SPM, post-hoc working from the onset triggers provided by e-prime 
(and psuedo-marking points later in the sentence). Im not very familiar 
with SPM but am I right in thinking that as long as the onset of the 
sentence is marked accurately, then we can - post hoc - set markers 
anywhere we want in the data thereafter? This may be the most ideal 
solution because I have 200 sentences, each of which must be labelled 
separately (so that I can recognise each one). Apparently e-prime is 
limited to sending out 250 labels so perhaps post-hoc multiple labelling is 
the answer. I would appreciate any thoughts any of you may have.

Many Thanks,
Ryan

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