Eyetracking- eye L not found

Comments

• Daniel

  April 2016 edited 5:51AM

  Hi Anapuma,
  The format or syntax of the EDF file that comes out of OpenSesame is standard. There's not much that OpenSesame can change about this, except maybe for the content of messages. I think there are two possibilities here:

  1. The left eye did not get registered correctly altogether by the eye tracker. Make sure it is configured correctly; for instance make sure it is not the right eye which is being tracked, or make sure the camera image on the EL computer shows a robust pupil detection.
  2. There is an error in your analysis script. It may be that it is old and the EDF syntax has changed in the mean time (though unlikely) or it contains other types of errors.

  In these cases it's always best to ask for help to people who have experience in doing eyelink studies in your surroundings. They might have bumped into this problem too and quickly know how to solve it.
  Good luck!

  
• Anupama

  April 2016 edited 5:51AM

  Hi Daniel,

  Thank you for your reply!
  Yes, maybe it's better to approach someone experienced to help me with the problem.
  But I was also wondering how I can ensure that the correct eye is being tracked by the eyetracker? I'm guessing this is not something I can adjust through my code? (Seems unlikely) But I just wanted to confirm, for future reference.

  In any case, I will ask for help from someone doing eyelink studies too!

  Thanks again!
  Anupama
• sebastiaan

  April 2016 edited April 2016

  Hi @Anupama,

  It sounds like you're using a custom analysis script to read the data file, right? In that case, the script probably just assumes particular settings, such as that the left eye is tracked.

  But I was also wondering how I can ensure that the correct eye is being tracked by the eyetracker? I'm guessing this is not something I can adjust through my code? (Seems unlikely)

  You actually can: pylink has functions to toggle between binocular and monocular recording, etc. You can change pretty much all settings programmatically through pylink. If you want to do that, you'll want to grab the pylink manual from the SR Research forum:

  • https://www.sr-support.com/

  But, if I remember correctly, you can also just enable binocular recording through the EyeLink setup screen. That's probably easier.

  Cheers,
  Sebastiaan

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

  April 2016 edited 5:51AM

  Hi Sebastiaan,

  Thank you for your reply! I did consult with my supervisor about the issue and turns out the custom analysis script had to be tweaked a little to read the output.
  But this information is also handy, since I would continue working with EyeLink in the future. So, thank you for the reference!

  Regards,
  Anupama