Stimuli/ Triggers/ Timing difficulties

[David McFarlane]

At 4/20/2012 12:45 PM Friday, Douglas wrote:
>Stimulus OnsetTime is given by E-Prime in the Spreadsheet at the end 
>of the experiment (*.edat2).
>And as for the Trigger OnsetTime, we are using c.setattrib 
>"condtime", Clock.ReadMillisec (we placed this in the same inline 
>that send the triggers)

I would not completely trust your Clock.ReadMillisec here, as there 
may be delays in program execution between Stimulus.OnsetTime and 
execution of your c.SetAttrib command.

Now, I hate to repeat myself, but...

>Now, Do you think there is a way to know the exact time E-Prime 
>presents the stimulus on the screen?

Again, you need an oscilloscope and a local electrical engineer to 
help you with that.

>How much do you think the difference is between the Stimulus 
>OnsetTime and the exact time the Stimulus is actually presented?

And again, YOU MUST STUDY CHAPTER 3 OF THE USER'S GUIDE BEFORE 
PURSUING THIS FURTHER!!!!!!!!!!

-- David McFarlane

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