Keyboard Timeout set to a jitter

Comments

• sebastiaan

  January 2017

  Hi,

  The error is because you're mixing the old (≤ 2.9) and new (≥ 3.0) ways of creating a keyboard object.

  The old way is to import the keyboard function (from openexp.keyboard import keyboard), and pass exp as the first argument. You're doing the former, but not the latter.

  # <= 2.9
  from openexp.keyboard import keyboard
  k = keyboard(exp) # Plus optional keywords
  

  The new way is to not important anything, and not pass exp as first argument. So it's much cleaner.

  # >= 3.0
  k = keyboard() # Plus optional keywords
  

  Does that make sense?

  See also:

  • http://osdoc.cogsci.nl/3.1/manual/python/keyboard/

  Cheers,
  Sebastiaan

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

  January 2017

  Sebastiaan,

  This absolutely makes sense. I removed the import and it appears to be working perfectly now. I had another problem come up though, when I try to evaluate whether or not a correct response is given, in the case where the correct response is 'None' (i.e., no keyboard response is the correct response), I can't get the program to evaluate that as a "correct response". I tried adding print lines and "correct_response" is 'None' and the response is 'None' but when I compare the values in an if-statement it evaluates as false! Any ideas?

  from random import randint
  
  #start timer
  t0 = clock.time()
  
  #calculate jitter length
  offset_time = randint(850, 1150)
  
  #initiate keyboard, set wait time to the jitter
  my_keyboard = keyboard(keylist=['space', '1'], timeout=offset_time)
  start_time = clock.time()
  
  #get keyboard response
  key, end_time = my_keyboard.get_key()
  var.response = key
  var.response_time = end_time - start_time
  
  #Set correct response
  if var.response == var.correct_response:
      correct = 1
  else:
      correct = 0
  var.correct = correct
  
  #print for debug
  print("--Trial--")
  print(var.response)
  print(var.response_time)
  print(var.correct_response)
  print(var.response == var.correct_response)
  print(var.correct)
  
  #calculate offset wait time (in case of early keypress), using the jitter
  t1 = clock.time()
  current = (t1-t0)
  if current < offset_time:
      time = offset_time-current
      self.sleep(int(time))
  
• eduard

  January 2017

  Hey,

  In case no response is given, your variable key, is of None type. The variables in your loop table are implicitly converted to a number or to a string (where applicable). So typing None, will eventually be converted to "None". Do you see what I mean? (If not you can print the types of your response and your correct response variable. To make it work, you can also convert your key variable to a string (e.g. var.response = unicode(key).
  Does this make sense?

  Eduard

  
• mckd

  January 2017

  Eduard,

  That absolutely makes sense and it absolutely worked. Thank you so much for your response!