Keypress duration as Sketchpad Duration

Comments

• DahmSF

  November 2016

  Hi shamshir,

  set "duration" to infinite.
  put a keyboard_response item afterwards.
  http://osdoc.cogsci.nl/3.1/manual/response/keyboard/

  Greetz
  Stephan
• shamshir

  January 2017

  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
  

  Regards
  Javi
• eduard

  January 2017

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

  Does this make sense?

  Eduard

  
• shamshir

  January 2017 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!
  Regards
  Javi
• shamshir

  January 2017

  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
  Thanks a lot!

  Regards
  Javi