RE: White Rectangle on Black Background

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White Rectangle on Black Background

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Rmoody	Rmoody posted 8 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 3, Visits: 24	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?
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Dave	Dave posted 8 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 105K	+x Rmoody - Sunday, September 3, 2017 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? 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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