Syncing SMI eye tracking output with OpenSesame output

Comments

• eduard

  March 2018

  Hi,

  I have not worked with SMI data myself, but generally, the timestamps are measured relative to a zero-point that is software specific. So, at some point during the initialization of Opensesame, the experimental clock is being started and all timestamps are measured relative to this moment. The same also holds for the SMI data, only that the zero-point is another one. Effectively, this means that you can't compare the absolute timings across the files. However, you can send messages to the eyetracker that will be written to the SMI files. If you include the opensesame time stamps, or some informative label as "stimulus appears", "response given" or whatever, you know which eye movement belong to which part of the experiment.

  Unfortunately, I don't think it is possible to match up the files without having common markers. So, if you haven't sent them along, and they haven't been written per default, I don't think you can sync the data reliably.

  Hope this clears things up.

  Eduard

  
• astarr

  March 2018

  Hi Eduard - thank you so much for the prompt response! My difficulty is with sending messages to the eye tracker. So far I have only been able to push messages/time stamp info to the SMI logfile (which already has the OpenSesame time stamps, but unfortunately not the SMI ones), but not the .idf file (which has the eye data and the SMI time stamps). How can I send messages to the .idf file? Thanks!
• FabioEyeLogic

  May 2022

  Hello everyone.

  For those who are still using SMI eye trackers / Software, im happy to pass by and let you know that we at EyeLogic have created an eye tracker that is fully compatible with SMI.

  Please send me an email in case you need more informations on that, and on our upcoming new hardware and software at fabio.pinto@eyelogicsolutions.com

  
  

  Thank you,

  Fabio

  https://www.eyelogicsolutions.com/