Sample Code for Tobii Eyetracker?

[Maria]

I am conducting a reaction time experiment and I want to use a Tobii T120 eyetracker to collect eye gaze and pupillometry data.

Now, I have read the SDK manual several times and I got the sample codes from the SDK (EyetrackerBrowser.py and SyncWatcher.py) to run; but I still don't know how to implement the eyetracker code into the experiment code. For example, I don't know how to call the eyetracker once the computer has connected to it to start collecting data; I don't know how to run the calibration; I don't know how to save the data; I know the names of those commands, they are all listed in the SDK handbook, but I don't know how to use them, especially in connection with the EyetrackerBrowser that is supposed to create an eyetracker object once it connected to the eyetracker - of this eyetracker object again I don't know the name ...

What I think I really need is just any example code from any experiment, that shows how to use the Tobii commands to get eye gaze data and pupillometry data.

Thank you so much!

[Sol Simpson]

Hi Maria,

I would suggest you use the psychopy.iohub module, which includes support for eye tracking devices including the Tobii. 

Demo coder scripts can be found in:

• psychopy.demos.coder.iohub_extended.eye_tracker folder. Run by:
  
1. Open the run.py file in the eye_tracker  directory with a python IDE and run the script, or start the script from a command window using the usual "python run.py".
2. A dialog should appear asking you to select the eye tracker you want to use. Select 'Tobii'. 
   
   
• psychopy.demos.coder.iohub_extended.gc_cursor.  (In the latest source on github only). For this example:
  

1. replace the iohub_config.yaml in the demo source with the one I have attached to this reply, which has been changed to use the Tobii eye tracker by default.
2. Open the run.py file in the gc_cursor directory with a python IDE and run the script, or start the script from a command window using the usual "python run.py".

There is also a PsychoPy Builder example that uses a custom code component to add the ioHub Eye Tracking Device Interface logic at:

• psychopy.demos.builder.iohub.stroop_eyetracking. To run this:
  

1. Start the PsychoPy2 Builder Application
2. Open the 'stroop.psyexp' file in the stroop_eyetracking folder.
3. Run the project.
4. When an input dialog appears at the experiment start, enter 'tobii_std.yaml' in the field labelled "Eye Tracker".
5. Press 'OK' and the demo should run.

Docs for ioHub are currently here. Information on the eye tracking device is here; and Tobii implementation details are here.

Let me know if you have any questions.

Thanks,

Sol

[Sol Simpson]

Sorry, the attachment mentioned in my first reply is attached here. ;)