[solved] count keystrokes in a specified time

Comments

• Edwin

  October 2014 edited 5:30PM

  Hi Sundar,

  The count_keyboard_response variable tells you how often the keyboard_response item has been run. Each keyboard_response item, per definition, collects only one keypress.

  If you would like to count how often participants press a key, you could do with a little Python inline scripting:

  from openexp.canvas import canvas
  from openexp.keyboard import keyboard
  
  # create a new canvas object, showing instructions
  my_canvas = canvas(exp)
  my_canvas.text("Press Space as often as you can!")
  
  # create a new keyboard object, with only Space presses allowed
  my_keyboard = keyboard(exp, keylist=['space'], timeout=1)
  
  # starting value for the keypress counter
  presscount = 0
  
  # run for ten seconds
  t0 = self.time()
  while self.time() - t0 < 10000:
      # check if there is a new keypress
      key, presstime = my_keyboard.get_key()
      # add one to the count if there was a keypress
      if key != None:
          presscount += 1
  
  # store the keypress as in OpenSesame workspace
  exp.set("keypress_count", presscount)
  
  # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
  # EVERYTHING BELOW HERE CAN BE REPLACED BY OPENSESAME ITEMS #
  # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
  
  # show a blank display for a second, signalling the participant to stop
  my_canvas.clear()
  my_canvas.show()
  self.pause(1000)
  
  # show the result
  my_canvas.text("You pressed Space %d times" % presscount)
  my_canvas.show()
  
  # wait for a keypress before continuing
  my_keyboard.get_key(timeout=None)
  

  The code is pretty self explanatory. Also, please note that everything below the marker can be replaced by a blank sketchpad with a Duration of 1000 ms, and a sketchpad with a Duration of keypress and a text like this: You pressed Space [keypress_count] times.

  Good luck!
• sundar

  October 2014 edited 5:30PM

  Thanks Edwin,
  This trick worked pretty well with python script.
  Also let me know how do i pass this variable "presscount"
  to be logged in in the logger .

  Regards,
  Sundar.
• Edwin

  October 2014 edited 5:30PM

  Go to your logger, click Add custom variable, type keypress_count.

  Also, it might be wise to go through some tutorials and the documentation pages.