Because recent low-cost commercial eye trackers are as inexpensive as decent camera units, open-source eye trackers may not be the most inexpensive current choice for eye tracking however, they would still be worthy of consideration depending on the required purpose. Usually, these open-source eye trackers require a camera unit to capture eye images. In addition to these commercial eye trackers, open-source low-cost eye trackers are also available (Li, Babcock & Parkhurst, 2006 San Austin, Skovsgaard, Mollenbach, Barret, Tall, Hansen & Hansen 2010 Zielinski, 2007). These eye trackers are sufficient for various experiments where a high sampling rate is not required. Recently, several low-cost commercial eye trackers such as The Eyetribe (The Eye Tribe Aps), GazePoint3 (GazePoint), and EyeX (Tobii Technology, Ltd) were released. A weakness of these products are the starting cost, particularly when introducing high-end models. They have precision and accuracy for research use, as well as application programming interfaces (APIs) for using eye trackers for experimental programs.
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For example, the Eyelink series (SR Research Ltd.), iViewX series (SMI GmbH) and Tobii series (Tobii Technology, Ltd) all exemplify high performance commercial eye trackers. At present, there are many eye trackers of various measurement principals, functionalities, sizes, and prices. In eye movement studies, recording devices called "eye trackers" are used for precise and accurate measurement. Therefore, eye movement measurement is an important technique in the study of human visual cognition, including domains such as space perception, scene recognition, reading, spoken language processing and various clinical studies (Liversedge, Gilchrist & Everling, 2011 van Gompbel, Fischer, Murray & Hill, 2007). During daily visual cognitive tasks, we frequently make rapid eye movements called saccades in order to look at visual targets with the central visual field, the spatial resolution of which is the highest in the visual field. Human visual functions such as color sensitivity and spatio-temporal resolution change across the visual field. Introduction: SimpleGazeTracker and Psychtoolbox When such a transfer delay is not importnat, Sgttoolbox would be a good choice for Psychtoolbox users who wish to conduct eye-tracking studies. Transferring the latest eye position from SimpleGazeTracker to Psychtoolbox script takes 2 to 4 ms on average, which causes a delay in drawing multiple visual stimuli when recording and stimulus presentation were performed on a single PC. A test of temporal accuracy showed that eye movement sampling frequency was stable when stimulus presentation and recording were performed on a single PC, although better performance was obtained when presentation and recording were performed on separate PCs.
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Hardware and software requirements for Sgttoolbox and its main functions are described.
This paper introduces a Matlab/Octave toolbox named Sgttoolbox, which works in conjunction with the widely used experiment control library Psychtoolbox to control a cross-platform open-source eye tracker named SimpleGazeTracker, which is an eye-tracking application of GazeParser software. However, synchronizing visual stimulus presentation with eye movement recording is still difficult, particularly if the eye tracker does not come with a practical application programming interface.
The cost of conducting eye movement studies has decreased as a result of the recent release of low-cost commercial and open-source eye trackers. Eye movement analysis is effective for investigating visual perception and cognition.
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