Fast, robust and reliable light sensor solution
Using an analog light sensor, the StimTracker for Tobii TX300 Eye Tracker provides a fast, robust and reliable solution. It is free from any software errors or timing errors that might appear due to delays in operating systems, graphic cards or pixel refresh algorithms. Windows and Linux are not real-time operating systems, making it difficult to be sure that a picture was shown at an exact time. StimTracker for Tobii TX300 Eye Tracker’s light sensor solution overcomes this problem.
System requirements
- StimTracker for Tobii TX300 Eye Tracker, including Cedrus Light Sensor and coaxial cable
- Tobii TX300 Eye Tracker (eye tracker firmware version 1.1 or higher)
- Stimulus presentation computer (e.g. Tobii Studio 3.1 or higher)
- Compatible EEG or other biometric system, including parallel port adapter cable to StimTracker
How does it work?
When a new stimulus is shown, the Cedrus Light Sensor detects a change and generates a TTL binary voltage signal (0 and 5 V). The signal is transmitted via the StimTracker for TX300 Eye Tracker unit to the TX300 Eye Tracker and the EEG/biometric data collection system. The eye tracker receives the signal, creates an event, and packages this event with the next gaze data package. The StimTracker event is time stamped with the same time value as the gaze point. The eye tracker sends the data to Tobii Studio and StimTracker data (EventMarker) is integrated in the eye tracking recording. Events can then be used to post post-synchronize the eye tracking data with the biometric data collection system data.