[open] buttons or inline script for randomized mouse clicking leading to different sound output?

Comments

• Jona

  September 2013 edited September 2013

  I'm sure there are other ways to do this, but this is how I randomize my inline scripts:
  

  That's how the loop containing the inline script looks like. The inline script takes 'val_x', and depending on the value of x, will present a certain stimulus. For example, if you create a list containing all possible coordinates of your button, and set the loop up so that it cycles to as many different values of x for, say, 100 times at random, you can simply do something like

  x = val_x # sets x to the current loop ID

  current_trial_coordinates_xy = list_of_all_possible_coordinates_xy[x]

  Depending on how familiar you are with python, I can go into more detail if necessary.
• sebastiaan

  September 2013 edited 2:16PM

  From reading the forums, I gather there are two ways to accomplish this: either through forms or through inline coding.

  Just to elaborate a bit on Jona's response, another option would be to place your stimuli in a sketchpad, and collect responses using the touch_response plug-in.

  For the touch_response you can set both the number of columns and the number of rows to 2, which means that the display will be divided into a 2x2 grid, like so:

  1 2
  3 4
  

  So responses 1 and 2 correspond to the top of the screen, responses 1 and 3 correspond to the left, etc.

  In the block_loop you define the coordinates of the target and the distractor stimulus. In addition, you define both correct responses. We need to define two correct responses, since the 'participant' is allowed to touch, say, the entire top of the screen (so 1 and 2) rather than just the top-right (1) or top-left (2).

  

  In the sketchpad item, you use the coordinates defined above to position the target and distractor, resulting in a script like this (depending on what kind of stimuli you use, the script will vary, of course):

  set duration 0
  draw circle [xTarget] [yTarget] 100 fill=1 color=red
  draw circle [xDist] [yDist] 100 fill=1 color=blue
  

  Finally, you add two sampler or synth items after the touch_response, one for a good response and one for a bad response. For the good response you use the following run-if statement:

  [response] = [correct1] or [response] = [correct2]

  For the bad response you use the following run-if statement:

  [response] != [correct1] and [response] != [correct2]

  Does that make sense? There are many other ways to implement this as well, but if you want to have an entirely Python-free implementation, than this might be the easiest way.

  Cheers!
  Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• Darby

  September 2013 edited 2:16PM

  Thanks all. I will give this a try and let you know how it goes.
• Darby

  September 2013 edited 2:16PM

  Brilliant, thanks Sebastiaan. This worked exactly like I wanted. Thanks so much.
• Darby

  September 2013 edited 2:16PM

  Ok, I was too eager in my earlier response. This works almost exactly like I want.

  It appears that if you touch anywhere on the screen, it registers and goes to the next trial. I think this is because the entire screen is divided into 4 boxes and we set it up to register a correct response in the two boxes on the side of the item (1 and 2 for an item displayed in the top position).

  Is there a way I can limit correct responses to just the circle on the screen? In other words, if they touch a blank spot on the screen I don't want that to register as a response.

  I think I could divide the screen into more boxes using touch_response, say a 7x7 grid. But, if I do this I am not sure of the exact coordinates that the circle would have to fall into if it was in say block 27 of the matrix.
• sebastiaan

  September 2013 edited 2:16PM

  If you want to determine whether the taps were close enough, you're probably better off using a little inline_script after all. Basically, what you can do is replace the touch_response by a mouse_response. This will not map the clicks/ taps onto a grid, but simply store the coordinates. Then you insert an inline_script right after the mouse_response, with the code below in the run phase. This will test whether the tap was close enough to the target coordinates (see code comments for more details).

  from math import sqrt
  # The maximum error from the target center
  maxClickErr = 100
  # Use Pythagoras to determine the click error and set
  # the variable `correct` to 1 (correct) or 0 (incorrect)
  # depending on whether the click error is small enough.
  # Because the cursor coordinates have 0,0 at the top-left
  # and the sketchpad coordinates have 0,0 at the center,
  # we need to compensate for the display size.
  xc = self.get('width') / 2
  yc = self.get('height') / 2
  # Determine x and y error
  dx = self.get('cursor_x')- xc - self.get('xTarget')
  dy = self.get('cursor_y')- yc - self.get('yTarget')
  # Determine error
  clickErr = sqrt(dx**2 + dy**2)
  # Determine `correct` variable
  if clickErr <= maxClickErr:
      exp.set('correct', 1)
  else:
      exp.set('correct', 0)
  

  Next, you should also change the Run-if statements for the synth/ sampler items, because we now simply use the variable correct. For the good responses:

  [correct] = 1

  For the bad responses:

  [correct] = 0

  Finally, you can remove the columns named correct1 and correct2 from the block_loop, because they are not necessary anymore.

  Cheers!
  Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• Jona

  September 2013 edited 2:16PM

  That's nifty. Also allows you to add the error/distance as another IV or DV.
• Darby

  September 2013 edited 2:16PM

  Nice. This worked great. Thank you so much for your help! I am now telling all my colleagues about opensesame. So, you may see more questions from us psychologists who test nonhumans.
• SarahB

  November 2013 edited November 2013

  hi,
  so I am taking over this code from Darby and we are now trying to have it so that when the primates touch the black part of the screen nothing happens, we only want a response (and move to the next trial) if they touch the circle. with this code already in place how do I go about doing that. I have attempted to using mouse click but can seem to get it do anything
• lvanderlinden

  November 2013 edited 2:16PM

  Hi Sarah,

  The code that Sebastiaan provided above, already checks whether participants' click error is small enough to count as correct (i.e., the built-in variable 'correct' gets the value 1). If the click error is larger, the response is labeled as incorrect (i.e., 'correct' gets the value 0).

  Next, you could use the square-bracket method in the Run-if statement(s) of the item(s) in your trial sequence, to make the next part of the trial dependent on the accuracy of the click (i.e., on the value of the variable 'correct').

  For more information, please see:

  • http://osdoc.cogsci.nl/usage/variables-and-conditional-statements/

  Does that make sense? If you have difficulties implementing this into your experiment, please let us know what you've already tried (e.g. by providing us with your experimental script), and what part is not working.

  Best,

  Lotje

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• lvanderlinden

  November 2013 edited 2:16PM

  PS: You could also have a look at this previous thread:

  • http://forum.cogsci.nl/discussion/583#Item_2

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• psukar

  January 2014 edited January 2014

  Hi I have recently begun my PhD at the university of warwick and I'm quite new to programming / code etc. I used the above piece of code as I am developing what I hope will be a touch screen Corsi task in which participants are required to watch a block sequence and then tap this out on screen in the same order. Therefore I need opensesame to regcognise a touch response within the square and not anywhere else on screen and then log the co-ordinate of the touch. I used the above code therefore and I think I have it working, of sorts, I may need much more help later as its in its infancy, but I was just wondering if you knew, for write up / understanding purposes how exactly the code calculates acceptable distance, how far is too far in essense from the square to be considered correct?

  Thank you , Katherine.

  [Edit Sebastiaan: This question has been asked again and answered here]