Change Background Screen Color?

[DustinG]

PsychoPy Users,

I'm trying to design an experiment in which the background screen color changes with the presentation of certain stimuli. I'm trying to use the Builder view as much as possible to keep things simple. The trial structure is such that participants would be presented with a fixation cross, followed by an instruction, followed by an image, followed by the participant's rating of the image. These trials would be done in several blocks.

What I need to happen is for the background screen color to be grey during the fixation cross, blue during the instruction and image presentations, and then grey during the image rating.
There would need to be a different background screen color for each instruction, corresponding to the background screen color of the following image presentation (e.g., Instruction 1 = red background screen color and Instruction 2 = blue background screen color).

I am new to Python and PsychoPy, so any advice would be greatly appreciated!

Thanks,
DustinG

[Jeremy Gray]

Hi Dustin,

try a code component with Begin Routine having:

win.setColor('darkred')  # or 'blue' or whatever

See http://www.psychopy.org/epydoc/psychopy.visual.Window-class.html#setColor

--Jeremy

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[DustinG]

Thanks Jeremy!

That definitely sets me in the right direction.

Is there a way to have background color change with different repeats of the trial? Attached to this reply is my excel spreadsheet with condition parameters. Hopefully that can provide a solid idea of how each repeat of the trial needs to go. Essentially the background color of the instructional cue needs to match the background color of the corresponding image. Each trial repeat would show a new cue and corresponding image.

Thanks!
Dustin

[Jonathan Peirce]

Actually I wouldnt use the screen setColor option - the way it works (using glClearColor) it only has an effect one frame later than expected.

Create a Grating Component with:
    texture=None
    mask = None
    size = 2
    units = norm

Make sure that's at the 'top' of your routine, meaing its code is executed first, so that it gets drawn before your other stimuli. Now you can control the color of your box on every trial as if it were a stimulus (it sort of is!)

Jon

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-- 
Jonathan Peirce
Nottingham Visual Neuroscience

http://www.peirce.org.uk/

[rhutc...@ucdavis.edu]

Hi Jon, 

I am actually running into a similar problem. I was wondering if you could append the code that we should include as a code component in builder mode to solve this problem? I am having some trouble using the "GratingStim" code. 

Best, 

Ryan

[Jonathan Peirce]

No need for code. Create a Grating Component (the button in the stimuli that looks a bit like the psychopy logo). Set its parameters as described below

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University of Nottingham

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[Ryan Hutchings]

Thank you so much! 

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