White Rectangle on Black Background

Rmoody — Mon, 04 Sep 2017 10:59:29 GMT

My dot probe task is currently set up to show a black fixation cross on the center of the screen, followed by a pair of images, and then a black text probe, all on a white background. I would like to change this to have the stimuli displayed on a white background but I do not want the entire screen to be white. Rather, I would like the background to have a black border surrounding a white rectangle (50%, 80%) in the center of the screen (50%, 50%). Is there an easy way to configure the background to have a shape in the center of it?

RE: White Rectangle on Black Background

Dave — Mon, 04 Sep 2017 10:59:29 GMT

[quote]

[b]Rmoody - Sunday, September 3, 2017[/b]

[/quote]

Set the /screencolor to black. Then define a white rectangular <shape> in the desired dimensions with /erase set to false, and either display that shape via the <trial>s' /stimulustimes (or -frames) or the <block>s' /bgstim. Putting it in the trials along with the other stimuli, should be the more robust option. I.e.

<defaults>
/ screencolor = black
...
</defaults>

<shape whitebg>
/ shape = rectangle
/ color = white
/ size = (95%, 90%)
/ position = (50%, 50%)
/ erase = false
</shape>

<trial exampletrial>
/ stimulustimes = [0=whitebg, fixation; 500=...]
...
</trial>

Hope this helps.

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White Rectangle on Black Background

RE: White Rectangle on Black Background