Eprime triggers to EEG out of sync

[armina]

Hi Ryan,

A few years ago we did it, it's quite simple. Now I am far from my working 
place and from the needed computer so I cannot tell you the exact InLine 
and the rest but the idea is the following. We've sent TTL signals from the 
lamps (you have 5 lamps on the SRB, just flash/sleep them). Each lamp 
signal was going to a separate channel. So, you have 5 channels to 
code/mark whatever you want. You may vary duration of the signal, number of 
the signals, duration between the TTL signals, and the channel. it gives 
you practically unlimited number of different markers :) you can have 
several markers for each trial and you never get lost in them. each channel 
can be set for something particular, say, one channel for sentence onset, 
another for specific components within the sentence (with each component 
having its specific marker), etc. This system was easy to structure and to 
use. Hope it helps.

good luck,

armina


On Sunday, 31 August 2014 00:05:53 UTC+3, Ryan Blything wrote:
>
> 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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