09-07-2020, 10:11 AM
The Threshold Coloring button toggles a colored overlay on the eye image, highlighting the tracked pupil (blue) and corneal reflection (cyan).
You should always keep this feature turned on during normal operation. This visual feedback is the best way to verify that the tracker's thresholds are set correctly and that you are collecting high-quality data. The only exception is during the initial physical setup, particularly in challenging environments (like an fMRI), if the overlay makes it difficult to locate the participant's eye or determine how the camera and IR are oriented.
In this case, you can turn the coloring off briefly to find the eye / orient the camera and IR correctly. Remember to turn threshold coloring back on before you adjust the thresholds and begin calibration.
For further information on how to set Pupil / CR thresholds optimally, please check the following resources:
You should always keep this feature turned on during normal operation. This visual feedback is the best way to verify that the tracker's thresholds are set correctly and that you are collecting high-quality data. The only exception is during the initial physical setup, particularly in challenging environments (like an fMRI), if the overlay makes it difficult to locate the participant's eye or determine how the camera and IR are oriented.
In this case, you can turn the coloring off briefly to find the eye / orient the camera and IR correctly. Remember to turn threshold coloring back on before you adjust the thresholds and begin calibration.
For further information on how to set Pupil / CR thresholds optimally, please check the following resources: