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| The CBU currently has 4 eye trackers. One is in the MEG lab, one in the MRI (from May 2009), and we have two separate eye trackers for use in other locations. All eye trackers are from SMI and use the same software for controlling the eye tracking hardware, for stimulus presentation and for analysis of the eye tracking data. | The CBU currently has 3 eye trackers. One is in the MEG lab, one in the MRI scanner, and one separate eye tracker is in the eye tracking lab in room 443. All eye trackers are manufactured by [[https://www.sr-research.com/|SR Research]]. |
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| All 4 eye trackers use 'dark pupil' technology, where the gaze of the eye is tracked by identifying the pupil and the reflection of an infra-red light source on the cornea. | == Eye tracking fundamentals == [[EyeTrackingFundamentals|Fundamental information about eye tracking technology]] |
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| Eye trackers come in two variaties: 'contact' and 'remote'. With contact eye trackers the camera and light source are fixed to the head, or the head is on a chin rest to limit movements relative to the camera. In remote systems the camera and light are in a fixed location, at some distance from the subject, enabling some head movements. Contact systems are more precise and reliable, in general. | [[http://www.eyemovementresearch.com|eyemovementresearch.com]] - A very good online resource for anything related to eye tracking |
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| Another important feature of an eye tracker is the frequency. To be able to follow the eye during saccades the minimum frequency is about 200 Hz. | == CBU Behavioural Eye Tracking Lab == The CBU Eye Tracking Lab is located in room 443 in the west wing. It contains the SR Eyelink 1000 tracker. |
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| === MEG eye tracker === This is a 50 Hz system that should theoretically be called a remote eye tracker, but actually behaves more like a contact system as head movement is extremely limited in the MEG helmet. For that reason the camera can actually be zoomed in quite closely and the accuracy of the MEG eye tracker should be reasonably high. |
== Using eye trackers == Eye tracking is not as easy as it might look, and there's also quite a bit of variability between subjects. Most problems can be solved and with the vast majority of people you should be able to acquire decent quality eye tracking data. |
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| === MRI eye tracker === The MRI eye tracker will arrive in May. It will be a system comparable to that in the MEG. |
[[SettingUpEyeTracker|Eye tracker setup]] |
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| === RED eye tracker === RED stands for 'Remote Eye-tracking Device', and this is a remote system. === Hi-speed eye tracker === This is a contact system that will allow frequencies of up to 1250 Hz for monoculair eye tracking and 500 Hz for binoculair tracking. |
[[EyeTrackingProblems|Common eye tracking problems]] |
Eye tracking
The CBU currently has 3 eye trackers. One is in the MEG lab, one in the MRI scanner, and one separate eye tracker is in the eye tracking lab in room 443. All eye trackers are manufactured by SR Research.
Eye tracking fundamentals
Fundamental information about eye tracking technology
eyemovementresearch.com - A very good online resource for anything related to eye tracking
CBU Behavioural Eye Tracking Lab
The CBU Eye Tracking Lab is located in room 443 in the west wing. It contains the SR Eyelink 1000 tracker.
Using eye trackers
Eye tracking is not as easy as it might look, and there's also quite a bit of variability between subjects. Most problems can be solved and with the vast majority of people you should be able to acquire decent quality eye tracking data.