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Zen
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Join Date: Mar 2007
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coordinates of pixels, Posted March 5th, 2007 #1
Hi, I found that in the new superlab it's possible for the subjects to use mouse and click the spot they are supposed to make response. My question is: can the coordinates of the pixels they clicked be recorded? Also when I set up the stimuli, how do I find out the coordinates of the region of interest in the stimuli?

Thanks a lot!

Min
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Hisham
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Join Date: Aug 2006
Location: San Pedro, CA
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Recording Pixel Position, Posted March 5th, 2007 #2
Hi Min,

Yes, it is possible to record the pixel position of a mouse click.

- From the Experiment menu, select Participant Input. A dialog (screen) appears.

- If Mouse or Touch Screen is not selected yet, click on it to select it.

- Click on the Data to Save tab.

You'll see a checkbox labeled "The pixel position". By default, it is turned on.

Quote:
Also when I set up the stimuli, how do I find out the coordinates of the region of interest in the stimuli?
You have two options: if you create fixed position responses in the Participant Input dialog and then you go to preview a visual stimulus from within the Event Editor, SuperLab will draw blue rectangles over the visual stimulus to show you where the response area is.

The other option is to create a response where the position on the screen is "Automatically determined by the position of the visual stimulus". This is a neat new option in 4.0 that relieves you from making sure that the visual stimulus and response area overlap -- it's automatic.

-- Hisham.
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Zen
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Join Date: Mar 2007
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Posted March 5th, 2007 #3
Hisham, this is really helpful. I appreciate it.

Min
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