SR Research EyeLink | EyeLink 1000 / 2K


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EyeLink 1000 / 2K - World's Fastest Video based Eye Tracker

The EyeLink® 1000 and EyeLink® 2K systems are provided with two possible mounting options.
Tower Mount		Desktop Mount

	Sampling Rates up to 2000 Hz Featuring no dropped samples and hardware interrupt driven real-time data output.
	Accurate Drift free, down to 0.15º average accuracy (0.25º - 0.5º typical)
	Two Mounting Options Available Desktop Mount supports remote monocular and binocular tracking. Tower Mount provides monocular sampling with maximum eye angle tracking range.
	Focal Imaging Technology Allows for vertical and horizontal head movements of +/- 25 mm without tracking loss
	High Resolution 0.01º in pupil-CR 1000 Hz tracking mode
	Real-time Access eye position data less than 2 msec delay
	Easy Fast and simple setup, calibration, validation
	Complete Software Set Including integrated high performance experiment creation and data analysis tools
	Compatible Works with SR Research Experiment Builder, Presentation®, E-Prime®, and other 3rd party experiment creation tools.

EyeLink 1000 / 2K

EyeLink® 1000 is video based eye tracking device that offers a 1 kHz sampling rate, while the EyeLink® 2K provides a 2000 Hz sampling rate. Both systems have excellent gaze accuracy and spatial resolution, ideally suited for a wide range of computer based eye tracking research, including reading, visual search, and oculomotor studies. The only difference between the EyeLink 1000 and EyeLink 2K is the camera sampling rate capability. The Desktop and Tower systems each have different benifits. Please see the EyeLink 1000 / 2K technical specifications page for an overview of each systems differences. The EyeLink 1000 / 2K camera can be easily mounted in either the Tower or Desktop configuration depending on which best suits the experimenter’s needs.
Both mounts can also be purchased together and shared between a single EyeLink 1000 / 2K camera and Host PC.

The Tower Mount uses an infrared mirror to optimize eye tracking range; the mirror is transparent in visible light but is reflective to the infrared light used to illuminate the participants' eye.

The Desktop Mount provides a remote, mirrorless, mounting configuration for the EyeLink® 1000 / 2K system. The camera and illuminator are remotely mounted and sit just below the monitor the participant is calibrated with.
The EyeLink Desktop mount can also be used as a fully remote 500 Hz eye tracker with the addition of the EyeLink Remote option.

Focal Imaging technology provides extremely high resolution eye data without the result of a limited camera field of view, allowing eye position to be tracked even when the head moves +/- 25 mm horizontally or vertically. Robust eye tracking in conditions of moderate head movement allows for a less restrictive head restraint or the use of only a forehead rest, ideal for studies where verbal responses are required.

Fixation Accuracy
To test fixation accuracy using the EyeLink® 1000 / 2K system a paricipant performed a repeated target fixation task to nine screen locations. The session was initiated with a calibration and lasted 35 minutes, during which no drift corrections were performed. During the session, 583 fixations were collected.

Figures A displays a scatter plot of fixation accuracy using the EyeLink® 1000 / 2K system. Each point on the figure represents one fixation event. The inset plot represents an enlarged view of the fixation ditribution around the center target position.

Figure B displays the fixation error histogram for the fixation set illustrated in figure A, demonstrating the tight fixation accuracy distribution under 0.5º.

Average fixation accuracy was 0.315º. Median accuracy equalled 0.260º.
The standard deviation of the accuracy was 0.223º.

Saccade Contingent Display/Saccade Resolution

As an example of EyeLink® 1000's superior real-time data access and recording resolution characteristics, a simple saccade-contingent paradigm was created using the SR Research Experiment Builder software. Participants fixated centrally and were instructed to saccade to a peripheral target as quickly and accurately as possible. Using an invisible boundary trigger, the target's position was changed by 0.9o during the participants' saccade to the target. Although the participants might not detect the positional change, a corrective saccade of less than 0.5o was invoked following the initial target saccade.

Figure C shows the horizontal eye position starting from the appearance of the initial target in the periphery. The saccadic RT of the participant was 190 ms. The targets position was moved approximately 20 ms into the saccade.

Figure D illustrates the corrective saccade made as a result of the target position change during the initial saccade. The amplitude of the corrective saccade was approximately 0.35o in the direction of the target position change, with a duration of 12 ms.

An EyeLink® Eye Tracker, coupled with the SR Research Experiment Builder and EyeLink Data Viewer software,
offer researchers the most complete, powerful, and easiest to use, eye tracking package on the market.


	Copyright © SR Research Ltd. 2001-2008. All Rights Reserved. EyeLink II, EyeLink 1000, and EyeLink 2K are intended for research purposes only and should not be used in the treatment or diagnosis of any medical condition. EyeLink is a registered trademark of SR Research Ltd., Mississauga, Ontario, Canada Last Modified on April 7th, 2008. Email Site Admin.View Legal Notice