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Keypress duration as Sketchpad Duration

edited November 2016 in OpenSesame

Hi all,

I'm aware that my question may have a ridiculously simple answer but I'm not able to find a working solution on my own.

As the title says, I need to present a sketchpad for as long as the participant presses a key.
In other words I will present sketchpad1 and it will remain on the screen until the participant presses a key. Then, sketchpad2 will be shown until the participant releases the key. In that moment, sketchpad3 will appear for some miliseconds and then the loop will start again.

I've looked at this other related threads:

But I have not been able to get it to work.



  • Hi shamshir,

    set "duration" to infinite.
    put a keyboard_response item afterwards.


  • Hi DahmSF,

    Thanks for answering! When I do what you mentioned, i'm not able to obtain the effect that I'm looking for. I would like to just press a key one time to go from sketchpad1 to sketchpad3. Let me explain again because now that I'm reading what I posted, it looks a bit confusing.

    I want to present a image (sketchpad1) until the participant makes a keyboard response. So, I set the duration of sketchpad1 to "0" and I put a keyboard-response afterwards. When a key is pressed (the space bar in my case), sketchpad2 will appear. During how much time? Well, as long as the participant presses the key. Then, when the participant releases the key, sketchpad2 should vanish and sketchpad3 should appear and remain in the screen for some miliseconds. Then the trial is ended and another sketchpad1 appears to begin a new one.

    I've looked in the documentation and I couldn't find any "release" key responses, but looking at the threads that I mentioned in the previous post, I've been able to construct a simple code that nearly reaches my goal. The only problems are that I just have to use sketchpad1 and sketchpad2 without the third one in order for it to work, and it skips the last trial (I guess because the loop element is over and the code only is on the loop element and not in the rest of the experiment).

    The code:

    import pygame
    stop = True
    while stop == True:
        for event in pygame.event.get():
            if event.type == pygame.KEYUP:
                stop = False


  • Hi Javi,

    Your code looks already promising. If you add the presentation of the second stimulus, you should be set. Can you try it?

        import pygame
        cv = canvas() # the second canvas
        cv3= canvas() # third canvas,0,10,fill=True) # just some stuff that I put on the canvas for illustration purposes,0,30,fill=True) # just some stuff that I put on the canvas for illustration purposes
        stop = True
        while stop == True:
            for event in pygame.event.get():
           # show the canvas
                if event.type == pygame.KEYUP:
                    stop = False

    Does this make sense?


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  • edited January 2017

    Hi Eduard,

    Your code could totally solve my problem, but I have the 3 canvas as 3 different sketchpads with variables and such. How do I link the specific sketchpads inside my loop and not other sketchpads that have the same name, that are presented in other parts of the experiment?

    Thanks a lot for your answer!

  • Ok, I've "discovered" this function:

    my_canvas = self.copy_sketchpad('my_sketchpad')

    If I'm not mistaken, this lets me copy a given Sketchpad as a canvas, once it has already been prepared.

    My first question regarding this is, do I lose information like how much time a given sketchpad is supposed to be shown? If so, how do I specify the time of a canvas?

    My second question is how should I edit the sketchpads so that they are only shown when the code says? Can I set their condition on the sequence to "never" so that they are prepared but only shown like the code from Eduard specifies?

    I'm sorry if I'm missing something very obvious :sweat:
    Thanks a lot!


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