[open] Limit number of fixations for Open Sesame Eye link Exp

Comments

• sebastiaan

  June 2014 edited 7:26AM

  Hi Olya,

  This will require a bit of inline scripting, but not much. Basically, you can make use of the wait_for_fixation_start() function like so:

  n_fixations = 5
  print('Wating for %d fixations' % n_fixations)
  for i in range(n_fixations):
      exp.eyelink.wait_for_fixation_start()
      print('Detected start of fixation %d' % i)
  print('Done!')
  

  See also:

  • http://osdoc.cogsci.nl/devices/eyelink/#libeyelink.wait_for_fixation_start

  Alternatively, if you don't like scripting, you could use the eyelink_wait plug-in, set the event to 'Fixation start', and put it in a loop to repeat it a few times. The inline_script way is a bit more straightforward, though.

  Cheers!
  Sebastiaan

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

  July 2014 edited 7:26AM

  Thank you Sebastian! So do I just type in the code above into the inline script Run window? The inline script is located above the sketchpad with all my face photos. Is that it?
• sebastiaan

  July 2014 edited 7:26AM

  Hi Olya,

  Yes, you can copy-paste the code into the run window of an inline_script. I suspect that you will have to place it below the sketchpad with the photo's though, because you want the fixation checks to occur after the photo's have appeared, right?

  I would also recommend walking through some basic Python tutorials. Some knowledge of Python will be very convenient if you want to do online checks, gaze-contingency, etc, with the Eyelink. See:

  • http://osdoc.cogsci.nl/python/about/#learning-python

  Cheers!
  Sebastiaan

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

  July 2014 edited 7:26AM

  Hi Sebastian,
  I have switched to pygaze plug-ins, so the code above doesn't work anymore. Could you please post the pygaze equivalent of it?
  Thank you very much.
• Edwin

  July 2014 edited 7:26AM

  Hi Olya,

  Replace exp.eyelink with exp.pygaze_eyetracker, and everything should work the same.

  Good luck!