[solved] possible to use time logger within trail?

Comments

• lvanderlinden

  October 2013 edited 8:39PM

  Hi,

  Perhaps you could look at a previous thread on a similar topic:

  • http://forum.cogsci.nl/index.php?p=/discussion/363/open-double-space-bar/p1

  Please let us know if this is not exactly what you're looking for, or if you have trouble implementing this method in your experiment.

  Best wishes,

  Lotje

  Did you like my answer? Feel free to
• Griff

  October 2013 edited 8:39PM

  Hi Lotje,

  thank you soo much! And my excuses that I did not find the existing threat myself. Now Im half there. The logger tells me the number of presses, but it does not give me the times. Is that also possible? Now only the first (or last?) press is shown.
  Kind regards,
• lvanderlinden

  October 2013 edited October 2013

  Hi,

  Saving the time stamps corresponding to all key presses within a current trial could be done like so:

  # Determine the timeout in ms:
  timeout = 3000
  
  # Create keyboard_response item:
  from openexp.keyboard import keyboard
  my_keyboard = keyboard(exp, keylist=['space'], timeout = 0)
  
  # Determine the timestamp of the start of the response
  # interval:
  start_time = self.time()
  
  # Give the number of spacebar presses a starting
  # value, namely 0.
  nPresses = 0
  
  # Collect keyboard response until 3000 ms (or whatever
  # you set the timeout to) passed:
  
  # Define the maximum number of responses:
  maxResp = 20
  
  # Make variables for time stamps, that have 'None' as 
  # starting value:
  for i in range(maxResp):
  
      # Create variable name (i.e. column header
      # in output file):
      varName = "time%.2d" % i
  
      # Assign the value 'None' :
      exp.set(varName, "None")
  
  
  while True:
  
      # Get new timestamp:
      current_time = self.time()
  
      # Continue only if the duration is still
      # smaller than timeout:
      if current_time - start_time < timeout:
  
          # Collect keyboard response:
          key, end_time = my_keyboard.get_key()
  
          # Add to the number of presses if response was not 
          # 'None' (meaning no key was pressed):
          if key != None:
              nPresses +=1
  
              # Create variable containing current time stamp
              # (called 'time01', 'time02', etc.)
              varName = "time%.2d" % nPresses
  
              # Set the new variable and give it the 
              # corresponding value:
              exp.set(varName, end_time)
  
      # If (more than) 3000 ms have passed, advance to the 
      # next part of your experiment:
      else:
          break
  
  # Set the number of spacebar presses for future use in the 
  # user interface (notably, the logger item).
  self.experiment.set('nPresses', nPresses)
  
  

  Now your output file should contain column headers called 'time01', 'time02', etc., containing the time stamps corresponding to the first and the second button press, etc.

  Does this help? Please let us know if you have any further questions!

  Good luck!

  Lotje

  Did you like my answer? Feel free to
• Griff

  October 2013 edited 8:39PM

  yeees! Thank you soo much!

  It is really amazing that you spend your time and effort to help us!

  big hug!
• Griff

  March 2014 edited 8:39PM

  Dear Lotje!

  It works like a charm, thank you so much!
  Now I would like to show my participants a video while they have to detect certain features. So i could use exacly the same experiment, only now "while" playing the video. I tried the built in vlc player but it seems to only first play the video and then collect the resonses, but not collect responses until the video stops.

  Kind regards,
• Daniel

  March 2014 edited 8:39PM

  Yeah, the event detection system is not really well implemented for the vlc plugin. I will have a look at it soon. It however is tested and it works for the gst variant of the media_player, so you might want to try that!