By KatrinaMcDonough - 10/2/2020
Hello,
I have a task that shows a brief flickering stimulus (mask) over the top of another image (hand). At mask offset, there is a box around the mask stimuli that flashes on the screen. Do you know what causes this afterimage and how to remove it?
Thanks
<picture hand>
/ erase = false
/ items = ("hand.jpg")
/ size = (80%, 80%)
/ position = (50%, 50%)
</picture>
<picture mask1>
/ items = ("Mask01.png")
/ size = (20%, 20%)
/ position = (80%, 50%)
</picture>
<picture mask2>
/ items = ("Mask02.png")
/ size = (20%, 20%)
/ position = (80%, 50%)
</picture>
<picture mask3>
/ items = ("Mask03.png")
/ size = (20%, 20%)
/ position = (80%, 50%)
</picture>
<trial action>
/ stimulusframes = [1= hand, mask1; 6= hand, mask2; 11=hand, mask3; 21= hand, mask1; 26= hand, mask2; 31= hand, mask3;
36= hand, mask1; 41= hand, mask2; 46= hand, mask3; 51= hand, mask1; 56= hand, mask2; 61= hand, mask3]
/ response = noresponse
</trial>
<trial response>
/ stimulusframes = [1= hand]
/ inputdevice = keyboard
/ validresponse = (57)
</trial>
<block test>
/ trials = [1= action; 2 = response]
</block>
<expt expt>
/ blocks = [1-10 = test]
</expt>
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By Dave - 10/2/2020
+xHello, I have a task that shows a brief flickering stimulus (mask) over the top of another image (hand). At mask offset, there is a box around the mask stimuli that flashes on the screen. Do you know what causes this afterimage and how to remove it? Thanks <picture hand> / erase = false / items = ("hand.jpg") / size = (80%, 80%) / position = (50%, 50%) </picture> <picture mask1> / items = ("Mask01.png") / size = (20%, 20%) / position = (80%, 50%) </picture> <picture mask2> / items = ("Mask02.png") / size = (20%, 20%) / position = (80%, 50%) </picture> <picture mask3> / items = ("Mask03.png") / size = (20%, 20%) / position = (80%, 50%) </picture> <trial action> / stimulusframes = [1= hand, mask1; 6= hand, mask2; 11=hand, mask3; 21= hand, mask1; 26= hand, mask2; 31= hand, mask3; 36= hand, mask1; 41= hand, mask2; 46= hand, mask3; 51= hand, mask1; 56= hand, mask2; 61= hand, mask3] / response = noresponse </trial> <trial response> / stimulusframes = [1= hand] / inputdevice = keyboard / validresponse = (57) </trial> <block test> / trials = [1= action; 2 = response] </block> <expt expt> / blocks = [1-10 = test] </expt>
Stimuli are erased at the end of the trial by default. That is what the "box" is. Set /erase = false in your <picture> elements and it will be gone.
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By KatrinaMcDonough - 10/2/2020
+x+xHello, I have a task that shows a brief flickering stimulus (mask) over the top of another image (hand). At mask offset, there is a box around the mask stimuli that flashes on the screen. Do you know what causes this afterimage and how to remove it? Thanks <picture hand> / erase = false / items = ("hand.jpg") / size = (80%, 80%) / position = (50%, 50%) </picture> <picture mask1> / items = ("Mask01.png") / size = (20%, 20%) / position = (80%, 50%) </picture> <picture mask2> / items = ("Mask02.png") / size = (20%, 20%) / position = (80%, 50%) </picture> <picture mask3> / items = ("Mask03.png") / size = (20%, 20%) / position = (80%, 50%) </picture> <trial action> / stimulusframes = [1= hand, mask1; 6= hand, mask2; 11=hand, mask3; 21= hand, mask1; 26= hand, mask2; 31= hand, mask3; 36= hand, mask1; 41= hand, mask2; 46= hand, mask3; 51= hand, mask1; 56= hand, mask2; 61= hand, mask3] / response = noresponse </trial> <trial response> / stimulusframes = [1= hand] / inputdevice = keyboard / validresponse = (57) </trial> <block test> / trials = [1= action; 2 = response] </block> <expt expt> / blocks = [1-10 = test] </expt> Stimuli are erased at the end of the trial by default. That is what the "box" is. Set /erase = false in your <picture> elements and it will be gone.
This worked great, thanks!
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