Eprime triggers to EEG out of sync

[aldelfino]

Hello everyone,

I'm running an experiment using triggers from Eprime to a BrainVision 
equipment. I need Eprime to send a trigger according to the position of 
target-words along the sentence e.g. at 0, 5, or 11 seconds after the 
beginning of the sentence. I tried used the following script:

WritePort &H378, c.GetAttrib("trigger") 'identifies the item’ 
              sleep  c.GetAttrib ("delay") 'identifies the position of the 
target-word after the beginning of the sentence’ 
              c.SetAttrib  "CheckResponseTime", Clock.Read

I defined two attributes: (i) trigger, as a code to identify the trigger 
according to each sentence, and (ii) delay, as the time after the beginning 
of the sentence the trigger should be sent to BrainAmp. After listening 
each sentence, the subject has to answer a yes-no question to check 
understanding. The problem is that the BrainVision cannot register the 
trigger synchronized with the delay attribute, but only with the time the 
subject hits the answer button.

Does anyone have a solution or an alternative script for my experiment?

Thanks in advance

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