[solved] How to log the duration of a key press?

Comments

• sebastiaan

  October 2011 edited 5:50PM

  Hi Mtoro,

  Welcome to the forum!

  Yes, that's possible. But you will need to refer directly to the libraries used by the back-end, because the openexp.keyboard module doesn't support "key up" functionality (I'll consider adding it, because it would be useful. So thanks for bringing this to my attention!)

  For the pygame-based back-ends (legacy and opengl) the following piece of inline_script should do the trick (so you would use an inline_script rather than a keyboard_response to collect responses):

  import pygame
  from pygame.locals import *
  
  key_down_time = None
  while key_down_time == None:
      for event in pygame.event.get():
          if event.type == KEYDOWN:
              key_down_time = self.time()
              break
  
  key_up_time = None
  while key_up_time == None:
      for event in pygame.event.get():
          if event.type == KEYUP:
              key_up_time = self.time()
              break
      
  key_duration = key_up_time - key_down_time
  self.experiment.set("key_duration", key_duration)

  You can modify this inline_script to fit your particular needs, but at least it shows how to determine the duration (uptime - downtime) for a keypress.

  For more information, you can refer to the pygame documentation:
  http://www.pygame.org/docs/ref/event.html

  For doing the same trick with the psychopy back-end, please refer to the psychopy documentation:
  http://www.psychopy.org/api/event.html

  Hope this helps!

  Kindest regards,
  Sebastiaan

  
  
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• mtoro

  October 2011 edited 5:50PM

  Many Thanks for the Answer!!

  Will try it monday and comment on the results,

  Great Job for OS,

  Hope you have a good time!

  Mauricio.
• sebastiaan

  January 2012 edited 5:50PM

  Inactive, marking as solved.

  
  
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