Sending markers to Tobii eye trackers


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Johannes
Johannes
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Hi,
I'd like to present a series of trials in which a fixation cross is shown for 1s, followed a picture for 2s, and record eyetracking data throughout each trial (3s in total).
If I do it in the following way, I get what I need in the eytracking datastream: 3-second-duration segments with marker codes :

<trial nor_no>
/ stimulustimes = [1=normal,nor_no_eye]
/ trialduration = 3000
</trial>
('normal' is the picture element, and 'nor_no_eye' is a port element)

Problem is: as soon as I try to include the fixation cross period into the trial, I only get 1s segments and I can't figure out a way to get the whole 3s covered:

<trial nor_no>
/ stimulustimes = [1=fixcross,nor_no_eye,2000=normal,nor_no_eye]
/ trialduration = 3000
</trial>

<trial nor_no>
/ stimulustimes = [1=fixcross,nor_no_eye,2000=normal]
/ trialduration = 3000
</trial>

I tried to set the port element's erase attribute to false, but that didn't help.

Any ideas?

Thanks,
Johannes




Dave
Dave
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Johannes - Thursday, February 23, 2017
Hi,
I'd like to present a series of trials in which a fixation cross is shown for 1s, followed a picture for 2s, and record eyetracking data throughout each trial (3s in total).
If I do it in the following way, I get what I need in the eytracking datastream: 3-second-duration segments with marker codes :

<trial nor_no>
/ stimulustimes = [1=normal,nor_no_eye]
/ trialduration = 3000
</trial>
('normal' is the picture element, and 'nor_no_eye' is a port element)

Problem is: as soon as I try to include the fixation cross period into the trial, I only get 1s segments and I can't figure out a way to get the whole 3s covered:

<trial nor_no>
/ stimulustimes = [1=fixcross,nor_no_eye,2000=normal,nor_no_eye]
/ trialduration = 3000
</trial>

<trial nor_no>
/ stimulustimes = [1=fixcross,nor_no_eye,2000=normal]
/ trialduration = 3000
</trial>

I tried to set the port element's erase attribute to false, but that didn't help.

Any ideas?

Thanks,
Johannes




Try setting the trial's /beginresponsetime to 0

<trial nor_no>
/ stimulustimes = [0=fixcross,nor_no_eye,2000=normal]
/ trialduration = 3000
/ beginresponsetime = 0
</trial>
GO

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