EEG in E-Prime: Sending triggers during a slide

[Tobias]

Hi there,

I have the following problem: I want to show a slide for 200 ms, allowing 
responses up to 1500 ms after slide onset. As I am doing an EEG experiment, 
constant slide presentation time is recommended which is why I set 
EndResponseAction to "None". Is it possible to send a trigger during the 
200 ms interval, i.e. in case a participant pressed the button after 145 
ms, there will be a marker in the EEG at that point in time? I only know 
the procedure of sending triggers with the onset (or offset) of a slide, 
e.g.

search.OnsetSignalEnabled = True
search.OnsetSignalPort = &HD030

But that doesn't help here since the trigger would obviously wait until the 
next slide comes no matter when I react in case I selected "None" for 
EndResponseAction.

Thanks,
Tobias

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