\n| \n Eye tracking technique<\/strong><\/p>\n<\/td>\n| \n Video-based pupil and corneal reflection eye tracking with dark and bright pupil illumination modes. Two cameras capture stereo images of both eyes for robust accurate measurement of eye gaze and eye position in 3D space, as well as pupil diameter.<\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye tracking mode<\/strong><\/p>\n<\/td>\n| \n Tobii Pro Spectrum has four different eye tracking modes for different groups of primate species:
\nHuman,
\nGreat ape,
\nMonkey,
\nSmall monkey<\/p>\n<\/td>\n<\/tr>\n | \n| \n Sampling frequency<\/strong><\/p>\n<\/td>\n| \n 60 Hz, 120 Hz, 150 Hz, 300 Hz, 600 Hz, or 1200 Hz (max. frequency depends on hardware version)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Precision<\/strong><\/p>\n<\/td>\n| \n Head supported
\n0.01\u00b0 RMS at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report)
\n0.06\u00b0 RMS at optimal conditions (raw signal) –<\/p>\n Head free-to-move
\n0.02\u00b0 RMS at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report)
\n0.08\u00b0 RMS at optimal conditions (raw signal)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Accuracy<\/strong><\/p>\n<\/td>\n| \n Head supported
\nDown to 0.16\u00b0
\nMedian: 0.30\u00b0 (P25: 0.24\u00b0 – P75: 0.41\u00b0) –<\/p>\n Head free-to-move
\nDown to 0.17\u00b0
\nMedian: 0.43\u00b0 (P25: 0.32\u00b0 – P75: 0.59\u00b0)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Binocular eye tracking<\/strong><\/p>\n<\/td>\n| \n Yes<\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye tracker latency<\/strong><\/p>\n<\/td>\n| \n Mean latency < 2 ms @ 1200Hz (SD < 0.2 ms)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Blink recovery time<\/strong><\/p>\n<\/td>\n| \n 1 frame (immediate)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Gaze recovery time<\/strong><\/p>\n<\/td>\n| \n Less than 150 ms<\/p>\n<\/td>\n<\/tr>\n | \n| \n Data sample output<\/strong><\/p>\n<\/td>\n| \n Timestamp,
\nGaze origin,
\nGaze point,
\nPupil diameter<\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye openness data stream<\/strong><\/p>\n<\/td>\n| \n Eye openness stream has the same frequency as frequency selected for the gaze stream and will have the same timestamps. Eye openness data is provided in millimeters, for each eye individually. <\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye image data stream<\/strong><\/p>\n<\/td>\n| \n Eye image stream frequency is approximately 10 Hz (one image with both eyes). Zoomed-in eye images available in tracking mode. Full-frame camera images are available in gaze recovery mode. <\/p>\n<\/td>\n<\/tr>\n | \n| \n TTL input stream<\/strong><\/p>\n<\/td>\n| \n 8\u2013bit timestamped data (256 event codes) –
\nEvent driven detection with a timestamp accuracy of 50 \u00b5s<\/p>\n<\/td>\n<\/tr>\n | \n| \n Tracker and client time synchronization<\/strong><\/p>\n<\/td>\n| \n Integrated between the eye tracker time domain and the client computer time domain with an accuracy of 100 \u00b5s<\/p>\n<\/td>\n<\/tr>\n | \n| \n User calibration<\/strong><\/p>\n<\/td>\n| \n Binocular, Monocular<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div> | | | | | | | | | | | | | | | |