Tag: Eyelink 1000

How to Turn on, Set Up and Run an Experiment on the Eyelink 1000

Document for download —> How to Eyelink 1000

Text from document below.

 

How to : Turn on, set up and run an experiment on the Eyelink eyetracker

 

Turn it on.

 

Turn on power to plug sockets.

 

Press On buttons on the host and the display PC and wait for them to load.

 

On Host PC type D and Enter.

 

On Display PC click on the Eyelink username.

 

Both should now be loaded and ready to run the experiment.

 

Load experiment

 

Transfer experiment to Display PC, or locate it on the hard drive.

 

You will want to run the deployed version of your experiment; this is normally the icon of a large blue eye. Just double click it to run the experiment.

 

Check camera focus and light levels

 

The Camera Setup will be a blank screen on the Display PC to begin with.

 

Press Enter to see the participant’s eye on the screen.

 

Press the Right arrow key to zoom in on the eye

 

From this screen you can see if the lens needs to be focused, you do this by gently turning the top edge of the camera lens, do not touch the actual lens, only the sides. The lens is focused when the image is crisp and you can make out the eyelashes clearly.

 

Once focused you can press A on the keyboard to auto adjust the light levels.

 

Now get the participant to look at the four corners of the screen and make sure the tracker has there pupil while they look at all four corners. If this is fine you can move onto calibration. If it is not fine then reposition the participant and the camera again from the beginning and try again.

 

Calibrate

 

To calibrate a participant press C on the keyboard, or click on Calibrate under Camera Setup on the Host PC.

 

Dependent on your calibration type you will see a dot on the display PC either in the centre or at the edge.

 

For the calibration you need to ask the participant to look at the first dot and then look at each dot as they appear.

 

Press the Spacebar to begin calibration, the dots will appear and disappear and on the Host PC you will see crosses indicating the dot fixations.

 

If it looks ok you can accept the calibration by either pressing Enter on the keyboard or Accept on the Host PC screen.

 

Validate

 

Now you can validate the calibration either by pressing V or by pressing Validate on the Host PC under Camera Setup.

 

A similar thing will happen as in the calibration, dots will appear which the participant has to follow. You will see on the Host PC screen that there are number next to each fixation which tells you the quality of the calibration, the error of the visual angle. Dependent on your type of study you will need to know the tolerance of this (*see below). If this looks ok you can accept the validation either by pressing Enter or Accept on the Host PC.

 

Your participant is now calibrated and ready to take part in the experiment.

 

Start Experiment

 

To start either press O or Output/Record on the host PC.

 

*Dependent on your type of study you will need to know the tolerance of your calibration, the error of the visual angle. You want to be sure that what the eye tracker is recording is what your participant is actually looking at. For most visual search studies this will be 0.5 (half a visual angle), but for reading boundary experiments you may want closer to 0.33(1/3 of a visual angle). This is because 1 visual angle is normally 3 characters on the screen and you want to be able to distinguish between each character accurately.