Hello,

I would like to modify the screen color of the AAT (following the Scrit of Katja Borchert, APPROACH-AVOIDANCE-TASK (AAT), last updated: 09-04-2014) because I am using pictures (as stimuli) which have a white background. Unfortunately, the screen color is white so one cannot differentiate between landscape and portrait-format (to push / pull the pictures).
Is there anything I can do to change the screen color into black?

I used this (I added screencolor):
<defaults >
/canvasaspectratio = (4,3)
/minimumversion = "4.0.4.0"
/ inputdevice = joystick
/joystickthreshold = 30
/screencolor = (X, X, X)
</defaults>
but I don't know how to mix black. Also, I tried it for just one color (e.g. /screencolor = (0, 0, 255) but the script didn't start.

Thank you,
Alexa

You can simply specify

/ screencolor = black

You'll also have to change the <shape eraser>'s /color to black

<shape eraser>
/ shape = rectangle
/ color = black
/ size = (100%, 100%)
/ erase = false
</shape>