Eyetribe experiment

Helen Jones

Hi everybody,

I hesitated a little bit before creating this new post but I really need your help.

Actually I would like to create an experiment to measure fixation length, blinks, saccades, scanpaths and heatmaps (it's part of my Phd research)
I downloaded OpenSesame 3.1 and the eye tracker I'll be using is the eye tribe.
I read a lot of posts before publishing my question in the forum. and it's more than a question

As I'm perfectly ignorant in progamming langages in general, I really need a step by step tutorial (like for the very very beginners) to create the experiment in Opensesame. So I'm begging you guys to be very patient

Can you please help me with that?

My experiment must contain 2 parts:

The second one (because it's the easiest) is to analyse eye movements while viewing simple images

The first one is to analyse eye movements while doing an eye-drawing. the software used for the eye-drawing in touchdesigner. Is there anyway to link touchdesigner to opensesame?

Thank you very much for your answer! I'll be very gratefull!

eduard

Hi Helen,

On OpenSesame's website, we do have a couple of tutorials made for beginners.

• http://osdoc.cogsci.nl/3.1/tutorials/beginner/
• http://osdoc.cogsci.nl/3.1/tutorials/intermediate/

and for the eyetrackings parts, you can also check out examples of how to use pygaze (a module that adds eye-tracker functionality to OpenSesame)

• http://www.pygaze.org/documentation/examples/

This should be enough for you to be able to record eye data (incl. all the ones you mentioned).
For the other part, the eye-drawing, I'm not quite sure what exactly it is you mean. Could you maybe give more details? There will probably be a way to connect to touchdesigner, but as I don't know it, I can't say much about it.

Hope this helps,

Eduard

Josh

Hi Helen,

We're in the process of developing an eye-tracking tutorial, so be sure to check back on the website frequently!

For now, you should start trying out a simple set-up where you collect the eye-position and place a dot at that location:

    # Create a keyboard and a canvas object
    my_keyboard = keyboard(timeout=0)
    my_canvas = canvas()
    # Loop ...
    while True:
        # ... until space is pressed
        key, timestamp = my_keyboard.get_key()
        if key == 'space':
            break
        # Get gaze position from pygaze ...
        x, y = eyetracker.sample()
        # ... and draw a gaze-contingent fixation dot!
        my_canvas.clear()
        my_canvas.fixdot(x, y)
        my_canvas.show()

This should be in the run-phase of an inline script. Don't forget to insert the pygaze_init and start_recording modules before arriving at your inline script. In the init module, you need to select the eyeTribe.

Cheers

Josh