Repeating a practice block or loop?

Comments

• Josh

  November 2016 edited November 2016

  Hi Charizard,

  It would be best to place your practice block in a loop item (and this loop item you just set to 99 cycles or something). Ticking the "show advanced options" box, you'll reveal a break-if statement that is set to never by default. You could insert something like =exp.accuracy >= 0.7.
  Now all you need is an accuracy variable. You could create and update the variable exp.accuracy in an inline_script item (run phase) that is placed in your trial sequence. To calculate the accuracy, you'll need to divide the amount of correct answers by the amount of trials, so at the start of the experiment you add these in another inline_script:

    trial_count = 0
    correct_answers = 0
    exp.accuracy = 0
  

  In the trial sequence inline_script, you add to the run phase:

   trial_count += 1
   if self.get('correct') == 1:
         correct_answers += 1
  
   exp.accuracy = float(correct_answers)/float(trial_count)
  

  Hope this helps.

  Cheers,

  Josh
• clb357

  November 2016

  Hi Josh

  Thanks -- this is definitely helpful!

  So to your knowledge, there isn't a "good" way to program it so that the person running the experiment can decide whether or not to repeat the practice in the moment/during the experiment? (There is a small bit of subjectivity when determining if the child "gets it" or not).

  Thanks again!
  Char(izard)
• DahmSF

  November 2016

  Hi Char,

  Here is a manual way to repeat 'a practice block'. (In my example it is simple question which is repeated.)

  You insert a question (picture or text) with two response options (eg. x and n).
  If the first is pressed, the experiment goes on. If the second is pressed, you repeat something.

      sessionRP=canvas()
      path = pool['session_nrRP.tif'] #that is the picture with the instruction to press x or n
      sessionRP.image(path)
      sessionRP.show()
      RP=keyboard(keylist=['x','n'])
      key, time=RP.get_key()
      if key =='x':  #now the part you want to repeat
          session.show()
          nb=keyboard(keylist=[1,2,3,4,5,6])
          key, time=nb.get_key()
          var.session_nr=key