Each subject's eye movements were monitored (binocular tracking) using an infrared video-based eye tracker with a sampling rate of 500 Hz (EyeLink 1000 Plus/Desktop Mount; SR Research Ltd., Kanata, Ontario, Canada) and a maximum spatial resolution of 0.01°. A nine-point calibration/validation sequence was performed at the beginning of every experimental session that relied on the eye tracker. Calibration and/or validation were repeated until the validation errors for all points were smaller than 1°. The gaze position error (i.e., the difference between the target position and the computed gaze position) was estimated during the nine-point validation process. The average gaze position error was 0.25°. A forehead rest was used throughout the experiment to minimize head movements and trial-to-trial variability in the estimation of gaze position.
Eyelink 1000 plus desktop mount
Manufactured by SR Research
Sourced in Canada
The EyeLink 1000 Plus/Desktop Mount is a high-performance, video-based eye tracker designed for research and clinical applications. It provides accurate and reliable eye movement data collection with a sampling rate of up to 2000 Hz. The system is capable of tracking binocular eye movements, and it can be configured with a desktop mount or an infrared camera that can be integrated into various experimental setups.
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11 protocols using eyelink 1000 plus desktop mount
1
Video-based Eye Tracking Protocol
2
Eye-Tracking Protocol for Visual Perception
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Eye Tracking Protocol for Gaze Monitoring
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Participants’ eye movements were monitored (monocular tracking) using an infrared video-based eye-tracker sampled at 500 Hz (EyeLink 1000 Plus/Desktop Mount, SR Research Ltd., Ontario, Canada) with a maximum spatial resolution of 0.01°. A 9-point calibration/validation sequence was performed at the beginning of every experimental session that relied on the eye-tracker. Calibration and/or validation were repeated until the validation error was smaller than 0.5° on average. The gaze position error, the difference between the target position and the computed gaze position, was estimated during the 9-points validation process. The average gaze position error was 0.2°. A real-time gaze position was sent to the display computer through a high speed Ethernet link. The continuous gaze information was used to draw a viewing window on the display screen at a refresh rate of 144Hz.
Gaze data were analyzed using the EyeLink parsing algorithm, which robustly classified fixations and saccades, excluding blinks. The saccadic velocity threshold of 30°/sec, saccadic acceleration threshold of 8000°/sec2, and saccadic motion threshold of 0.1° were used to define saccades from fixations [47 –50 (link)].
Gaze data were analyzed using the EyeLink parsing algorithm, which robustly classified fixations and saccades, excluding blinks. The saccadic velocity threshold of 30°/sec, saccadic acceleration threshold of 8000°/sec2, and saccadic motion threshold of 0.1° were used to define saccades from fixations [47 –50 (link)].
4
Eye-Tracking and Linguistic Processing Experiment
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After giving informed consent, participants first completed the ASI and then the NGRO scale. This took about 10 min. Then, the eye-tracking experiment began, which also took about 10 min to complete. Participants sat comfortably at approximately 70 cm from the computer screen and rested their chins on the eye tracker’s head support. Their eye movements were recorded using an Eyelink 1000 Plus Desktop Mount (SR Research) as they inspected a visual display and listened to linguistic materials through standard computer speakers on each trial. They were instructed to pay attention to what they were hearing and to what they were seeing, which is sometimes called “look-and-listen” studies (see Huettig et al., 2011 (link)). They also learned that, occasionally, a yes-or-no question about the sentences or the pictures would have to be answered. Before the beginning of the experiment, a default calibration procedure was carried out. On every trial, a participant began fixating a cue in the center of the screen, allowing the experimenter to initiate the trial (or re-calibrate whenever necessary). The visual display was presented for 3 s before the spoken sentences were presented.
5
Multimodal Perception and Physiology Study
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The stimuli were created using MATLAB (2017b) in conjunction with the Psychophysics Toolbox33 (link),34 (link), displayed using a gamma-corrected Display + + LCD monitor (Cambridge Research Ltd, 1440 × 1080 px, 100 Hz).
Observers sat in a room with no illumination other than the display screen and viewed the visual stimuli from a viewing distance of 116 cm with their head position stabilized with a chin rest. Observers listened to the auditory stimuli using Sennheiser HD 202 II headphones with the volume set to 50%. The left eye was recorded using an EyeLink 1000 Plus Desktop Mount (SR Research) sampled at 1000 Hz. Heart rate was recorded using Biopac’s MP160 system using a photoplethysmogram transducer attached to the observer’s index finger of choice.
Observers sat in a room with no illumination other than the display screen and viewed the visual stimuli from a viewing distance of 116 cm with their head position stabilized with a chin rest. Observers listened to the auditory stimuli using Sennheiser HD 202 II headphones with the volume set to 50%. The left eye was recorded using an EyeLink 1000 Plus Desktop Mount (SR Research) sampled at 1000 Hz. Heart rate was recorded using Biopac’s MP160 system using a photoplethysmogram transducer attached to the observer’s index finger of choice.
6
Eye Tracking Setup for Visual Perception Study
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Stimulus presentation was controlled using E-Prime (version 2.0.1.127, Pychology Software Tools, Pittsburgh, PA, USA) on a portable computer with a 22 inch- LCD monitor (HP Compaq LA2205wg). The monitor was 474 mm (1280 pixels) high and 296 mm (768 pixels) wide and the refresh rate was 60 Hz. The stimuli were viewed binocularly from a distance of 68 cm, leading to a pixel size of approximately 0.03°. The eye position of the left eye was recorded using an Eyelink 1000 Plus Desktop Mount (SR Research Ltd., Mississauga, Ontario, Canada) system, using corneal reflection and pupil tracking. The temporal resolution of the eye tracker was 2000 Hz. Head movements were minimized by stabilizing participants’ head using a chin- and forehead rest. Participants were tested individually in a dimly lit, sound-attenuated chamber.
7
Eye-Tracking Methodology for Viewing Tasks
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An eye-tracking device was used in order to track eye movement and foveal fixation during the viewing task. The eye-tracking device used was the EyeLink® 1000 Plus Desktop Mount (version 5.03; SR Research Ltd., Ottowa, Ontario, Canada). This is a video-based eye-tracker with a high spatial resolution (<.01° RMS) and a sampling rate of 1000Hz. Viewing was binocular, but only the most dominant eye was monitored. This approach was taken as Nyström et al. [38] (link) found that dominant eyes are tracked more accurately, they produce significantly less offset than nondominant eyes. Position accuracy ranged from 0.25° -0.5°. The tracker was placed on the desk beneath the computer screen. A chin and forehead rest were used at a height level to the screen, in order to stabilize the head at a constant distance (approx. 70 cm) from the screen and to minimize head movements. Eye-movements were monitored via the reflection of infrared light on the cornea and the pupil, which is sensed by the tracker. This information was then analysed to extract real-time estimates of eye-rotations. Corneal and pupil thresholds were calibrated for each participant.
8
Facial Expression Perception Study
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The experimental task was programmed using E-prime stimulus presentation software (Psychology Software Tools, Inc., Pittsburgh, PA, USA). The faces were presented on a 19.7-inch CRT monitor. The display resolution was set to 1024 × 768 pixels, with a refresh rate of 85 Hz. Participants were asked to put their head on a chin strap set such that the distance between the eyes and the screen was 70 cm. Participants’ eye movements were monocularly recorded (right eye, Pupil-CR tracking mode) at a sampling rate of 250 Hz using the eye-tracking system EyeLink 1000 Plus Desktop Mount (SR Research Ltd., Mississauga, ON, Canada).
9
Multimodal EEG and Gaze Tracking Protocol
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Continuous EEG signals were recorded from 64 channels using Ag/AgCl active electrodes arranged in an extended international 10-20 layout (ActiCap, Brain Products GmbH, Gilching, Germany) at a sampling rate of 1000 Hz, referenced at FCz with a high-pass filter of 0.1 Hz.
Participants’ gaze position was tracked with an EyeLink 1000 Plus desktop mount (SR Research, sampling rate: 2000 Hz). The eye-tracker was recalibrated after a break (73 – 97 trials) if fixation was not focused on the centre of the screen (± 1° visual angle tolerance). After each block in which saccades toward the stimulus (> 5° from central fixation) were detected online by the EyeLink software participants were given feedback at the end of a block to encourage central fixation.
Participants’ gaze position was tracked with an EyeLink 1000 Plus desktop mount (SR Research, sampling rate: 2000 Hz). The eye-tracker was recalibrated after a break (73 – 97 trials) if fixation was not focused on the centre of the screen (± 1° visual angle tolerance). After each block in which saccades toward the stimulus (> 5° from central fixation) were detected online by the EyeLink software participants were given feedback at the end of a block to encourage central fixation.
10
Multimodal EEG and Gaze Tracking Protocol
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