[solved] How do I collect the keyboard_response after a stimulus disappears?

Comments

• sebastiaan

  May 2012 edited August 2013

  Hi Jongsup,

  Yes, of course I remember! Great to heard that you're actually using it now.

  Below is a quite elaborate inline script that should do what you need. Basically, it collects a response first with a timeout of 500ms. If no response is collected during that time, the display is blanked and a response is collected again for 1500ms, giving a total timeout of 2000ms. It also maintains feedback variables, etc., which is actually most of the script. Importantly, the script assumes that it is preceded my a sketchpad called my_sketchpad with a 0ms duration. So you can just present the target stimulus on a regular sketchpad.

  Hope this helps!

  Cheers,
  Sebastiaan

  # This code snippet assumes that it is
  # preceded my a sketchpad called 'my_sketchpad'
  # with a 0 duration.
  #
  # The code below collects a response for a
  # maximum of 2000ms. After 500ms the canvas
  # is blanked.
  
  from openexp.canvas import canvas
  from openexp.keyboard import keyboard
  
  # Uncomment for 0.25 or earlier
  # exp = self.experiment
  
  # Some settings
  timeout1 = 500
  timeout2 = 2000
  allowed_keys = ['z', 'm']
  
  # Create keyboard and canvas objects
  my_keyboard = keyboard(exp, keylist=allowed_keys)
  my_blank_canvas = canvas(exp)
  
  # Set actual timeout. By taking into account
  # the current time and the timestamp of
  # my_sketchpad we reduce temporal jitter
  timeout = timeout1  - self.time() + exp.get('time_my_sketchpad')
  
  # Collect a keyboard response with a stim_dur timeout
  # and show a blank canvas afterwards
  resp, time = my_keyboard.get_key(timeout=timeout)
  my_blank_canvas.show()
  
  # If no response has been given, we wait for another
  # post_stim_dur milliseconds
  if resp == None:
      timeout = timeout2 - self.time() + exp.get('time_my_sketchpad')
      resp, time = my_keyboard.get_key(timeout=timeout)
  
  # Set response, correct, and response time
  response_time = time - self.get('time_my_sketchpad')
  response = my_keyboard.to_chr(resp)
  if not self.has('correct_response'):
      correct = 'undefined'
  elif response == self.get('correct_response'):
      correct = 1
  else:
      correct = 0
  exp.set('response_time', response_time)
  exp.set('response', response)
  exp.set('correct', correct)
  
  # Maintain feedback variables. This ensures that
  # you can use the feedback item as usual
  exp.total_responses += 1
  if correct:
      exp.total_correct += 1
  exp.total_response_time += response_time
  exp.acc = 100. * exp.total_correct / exp.total_responses
  exp.avg_rt = exp.total_response_time / exp.total_responses
  exp.accuracy = exp.acc
  exp.average_response_time = exp.avg_rt
  

  
  
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• jsjun

  May 2012 edited May 2012

  Goodness! How can I express my deepest gratitude to you, Sebastiaan? I will definitely test this inline script with my students, and may ask you further questions. At the moment, I want to let you know that I have taught more than 80 students how to use OpenSesame this semester here in Korea. We all admire your help and achievement!

  JS