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Hi Esteban,
Apologies, I should have read better about you were planning to do this auditorily! Sounds like a really interesting study, though.
Yes, so in this case it would be best to look up exactly the onset of each audio files incongruent word (e.g. in CoolEdit) and put that in the attributes as described by David. Note that prerelease of the critical stimulus should be set to 0 – otherwise (if memory serves) the triggers are not actually sent as E-Prime will be busy with the next stimulus preprocessing. If you have a limited number of stimuli, I’d also send out a trigger at the start of each sentence with a code for each separate audio file so you will always know afterwards what exactly is sent. Easiest, however, for EEG analysis is having everything together in a bunch, so let’s say you have a picture (X: number 1-99), an audio file (Y: number 100-199), and the congruent/incongruent stimulus at a certain delay (time Z). Something like this might work:
At audio onset + delay Z, send 250 for congruent and 251 for incongruent.
At audio onset + delay Z + 10, send 0
At audio onset + delay Z + 20, send X
At audio onset + delay Z + 30, send 0
At audio onset + delay Z + 40, send Y
At audio onset + delay Z + 50, send 0
Now, even after epoching, and time-locking to 250 or 251 in brain vision analyzer or eeglab or such, you will retain all information regarding the stimulus. For it to work in E-Prime, you’d need something like 7 attributes:
[sentence] [sentencetrigger] [sentencecongruence] [sentencecongruencetrigger] [sentencewordonset] [picture] [picturetrigger]
[sentence] being the audiofile, [sentencetrigger] the corresponding trigger, [sentencecongruence] being congruent or incongruent, [sentencecongruencetrigger] being 250 or 251, [sentencewordonset] being Z above, [picture] being the picture filename, [picturetrigger] being its corresponding trigger.
And a little inline at the beginning of the trial:
c.setattrib “zplus10”, c.getattrib (“sentencewordonset”) + 10
c.setattrib “zplus20”, c.getattrib (“sentencewordonset”) + 20
…and so on.
The audio/slide onset can then use task events:
the first, delay: [sentencewordonset] and trigger: [sentencecongruencetrigger]
the second, delay: [zplus10] and trigger: 0
…and so on.
Hope that helps. Tips like this for E-Prime, OpenSesame, and MATLAB, not to mention ridiculous stories from my life and as an EEG researcher, see “A Psychologist's guide to EEG: The electric study of the mind” – out November with SAGE.
Best,
Michiel
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