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These systems sacrifice participant freedom of movement and comfort for data quality.
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Enhanced accuracy and precision: All eye tracking systems have to accommodate head movements. By stabilizing the head, these systems can remove at least some head-movement artifacts and noise from the eye tracking data.There are typically three reasons for doing this: The ultra-high precision EyeLink1000 Plus system can be used at 1000 Hz binocular in remote mode, or 2000 Hz monocular with the chinrest. These eye tracking systems utilize some method of constraining the participant’s head movements, usually via bite-bar or chinrest. These are typically high-fidelity research systems that are used in neurophysiology or vision experiments where participant comfort is secondary to accuracy and precision. Sometimes head stabilization is done in conjunction with another technology that already immobilizes the head (fMRI, MEG, etc). Most modern eye tracking systems fall into one of four categories: Head-stabilized, remote, mobile (head-mounted), and embedded (integrated). We’ll discuss some of these tradeoffs below, and explain these metrics in much more detail in a subsequent blog post. Specifications: Measures such as spatial resolution, sample rate and accuracy are important for many research applications and can have an impact in other areas too. There are some tradeoffs in terms for performance vs. Understanding the limitations in tracking scope is one of the most important parts of purchasing an eye tracking device. Tracking Area: Most eye tracking devices use a computer screen as the stimulus area and do not track eye movements elsewhere. Some systems are capable of tracking relative to more complex geometries (like a cockpit or multiple-screen area) and a few are designed for real-world tracking over almost anything the participant looks at. Other more invasive methods of eye tracking (scleral search coil systems, for example) are outside of the scope of this entry. Human Interface: The most immediately obvious difference between eye tracking devices is in how they interface with the user and environment. Some systems require head-stabilization via a chinrest or bite-bar. Other devices are built into a headband or glasses and are worn by the participant. Probably the most common type does not touch the person at all and measures the eye from a distance.ĭifferences in human interface usually exist to accommodate #2 and #3 in this list, and we’ll discuss that in more detail below.
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Here are some of the ways that eye tracking hardware may differ: They mostly use similar techniques for pupil and cornea reflex detection, but there are some significant differences in form factor and functionality. In our previous blog post on eye tracking, we discussed the basics of eye tracking technology and how these systems function to measure movements of the human eye.Įye tracking systems are used in the measurement of eye position and visual attention for research purposes, medical diagnosis, or to provide an alternative interface method for a computer or device.