I am creating a TMS experiment where a trigger is sent to TMS at some point during a sequence of stimuli. I have inline code to trigger TMS but I do not know how to time the onset of the trigger and the number of times the trigger was used. I imagine there's some code I could use but I'm not sure where to find it. Thank you!

Evelina

Experimental design: (1) InLine script to randomize the onset of the trigger;  (2) Instructions;  (3) List with stimulus parameters (vary on trial-by-trial basis);  (4) Trial sequence - Fixation, target, blank slide

I want to be able to log in the .edat file the onset and offset of the trigger together with other variables (target onset etc.). For that purpose I have declared 2 global variables "PulseOn" and "PulseOff" under the User tab in the Script window. In my InLine code right after trigger is executed (and I know that the trigger works just as it should) I have added

PulseOn = Clock.Read
c.SetAttrib "PulseOnset", PulseOn

and similar code is placed after the port is turned off for trigger offset time stamp. However, when I run this code, the variables PulseOnset/Offset are not saved in the data file. I have also tried to use c.Log in this InLine but then only one line of data (one trial) is saved and although trigger onset/offset are marked, there is no more any data about the objects presented during the trial.

In the documentation I have found that "a variable must be set as an attribute of the context object in order to be logged in the data file" so I assume that the issue here is that PulseOn/Off aren't really "attached" to any object in the experiment... Is there a way around that?

THANK YOU!

Evelina

http://groups.google.com/group/e-prime/browse_thread/thread/61940a2d9d021fe0/ef7a4f4ffbe213c2#ef7a4f4ffbe213c2