Synchronizing on-screen stimuli with eye tracking data
StimTracker provides a reliable and accurate solution to time stamp the onset of screen-based visual stimuli (images shown in Tobii Pro Lab and eye tracking data from Tobii Pro Spectrum) down to a timing accuracy of less than a millisecond. This exceptional timing accuracy benefits studies that require a high temporal resolution, such as reaction time tests and subliminal single-frame stimuli tests.
Independent of delays in operating systems, graphic cards, or pixel refresh algorithms, pixel changes on the screen are detected by a light sensor and then sent by StimTracker to Tobii Pro Spectrum as event markers. Stimuli changes can then be accessed by users of Tobii Pro Lab directly in their eye tracking data, or they can be exported to other analysis programs. In addition to this, any other stimuli presentation or eye tracking recording software that works with our eye tracker through the Tobii Pro SDK can be used.