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An EyeLink Portable Duo Tutorial: Running an Experiment
©
2016-2017 SR Research Ltd.
The variable
online_dcorr_maxangle
specifies the maximum distance in degrees
of visual angle that is an acceptable drift correction. This can prevent
adjustments greater than this size. The default value is 5.0 degrees of visual
angle:
online_dcorr_maxangle = 5.0
3.12 Exiting the Host Application
You can now close the EyeLink Host Application. Press the key combination
‘CTRL+ALT+Q’ from any point in the Host PC tracker program or click on the
“Exit” button in the Setup screen and choose the “Exit” option to go to the File
Manager. To perform an orderly shutdown of the Host PC by closing all
processes running, click on the “Exit” button from the Setup screen and then
choose “Shut Down” option if the Host Application is still running. From the
File Manager, you may click on the red Shutdown button on the toolbar.
3.13 EyeLink Portable Duo Setup Summary
It is suggested that you try the procedures in this section until you feel
comfortable with the EyeLink Portable Duo setup, and can reliably get good
calibrations.
This is a summary of the steps detailed in the practice session. It assumes no
setup problems are encountered.
•
Start the EyeLink Host Application.
•
Start TRACK.EXE on the Display PC.
•
Have the participant seated in the chair comfortably. Adjust the height of the
chair so that the participant’s eye line is at the upper part of the monitor.
•
Select the appropriate Operating Mode (Head Stabilized vs. Remote Mode).
When using the Remote mode, put the target sticker on the participant’s
forehead and adjust the position/angle of the eye tracker unit.
•
From the Setup screen, press ENTER to transfer the camera image to the
Display PC.
•
Click on the eye image in the global view to properly acquire the pupil to
track.
•
Focus the camera image if it looks blurred.
•
Set the threshold with the ‘
A
’ key, and fine-tune with
⇑
and
⇓
keys. Have the
participant look at the four corners of the screen to check pupil/CR image
and thresholding.
