We used an eye-tracker to continuously track and evaluate gaze position during the experiment, stopping experimental presentation whenever the gaze deviates more than 3° at a circular region around the fixation mark. Aborted trials were added to the end of the block. Eye-tracking was measured with the Eyelink 1000 eye-tracker from SR research (Eyelink 1000, SR Research Ltd., Mississauga, Canada). Participants were asked to place their heads on a chin rest, and the right eye was recorded. The recording sampling rate was 1000 Hz. Before each presentation block, an eye-tracker calibration procedure was automatically initiated using a five-point calibration procedure.
Eyelink 1000
Manufactured by SR Research
Sourced in Canada
The EyeLink 1000 is a high-performance eye tracker that provides precise and accurate eye movement data. It is capable of recording monocular or binocular eye position at sampling rates up to 2000 Hz. The system uses infrared illumination and video-based eye tracking technology to capture eye movements. The EyeLink 1000 is designed for use in a variety of research applications, including cognitive science, psychology, and human-computer interaction studies.
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Lab products found in correlation
Matlab, by MathWorks (88 mentions)
Experiment builder, by SR Research (21 mentions)
Propixx projector, by VPixx Technologies (15 mentions)
Experiment builder software, by SR Research (11 mentions)
Data viewer, by SR Research (7 mentions)
Viewpixx monitor, by VPixx Technologies (7 mentions)
Psychophysics toolbox, by MathWorks (7 mentions)
Eyelink toolbox, by SR Research (5 mentions)
Matlab r2016b, by MathWorks (4 mentions)
Viewpixx display, by VPixx Technologies (4 mentions)
Skyra mr system, by Siemens (4 mentions)
Psychtoolbox, by MathWorks (4 mentions)
Syncmaster 2233rz, by Samsung (4 mentions)
Experiment builder program, by SR Research (3 mentions)
Eyelink toolbox, by MathWorks (3 mentions)
Gdm 5402 crt monitor, by Sony (3 mentions)
Matlab software, by MathWorks (3 mentions)
V probe, by Plexon (3 mentions)
Presentation software, by Neurobehavioral Systems (3 mentions)
Experiment builder 1, by SR Research (3 mentions)
664 protocols using eyelink 1000
1
Gaze-Contingent Experiment Presentation
2
Eye Tracking in Behavioral and Imaging Sessions
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An infrared eye-tracker (EyeLink 1000, SR Research Ltd., Ontario, Canada) was used to record eye movements binocularly in the behavioral session (sampling at 500 Hz) and monocularly during the MRI sessions (sampling at 500 Hz). A desktop mount with chin rest was used in the behavioral session, and a long-range mount with head stabilization was used in the MRI session.
Stimuli were generated on a PC running Windows XP (Microsoft, WA, USA) and using Experiment Builder (SR Research Ltd., Ontario, Canada), which allowed online integration with the EyeLink 1000 (SR Research Ltd., Ontario, Canada) eye tracker. Visual stimuli were presented during the behavioral session on a Samsung SyncMaster 2233RZ (Samsung, NJ, USA) LCD monitor (1680 × 1050 @ 120 Hz; see (Wang and Nikolic, 2011 (link))), during the imaging session on a Boxlight CD715X (Boxlight Corporation, WA, USA) DLP projector (1024 × 768 @ 75 Hz) and rear projection screen.
Stimuli were generated on a PC running Windows XP (Microsoft, WA, USA) and using Experiment Builder (SR Research Ltd., Ontario, Canada), which allowed online integration with the EyeLink 1000 (SR Research Ltd., Ontario, Canada) eye tracker. Visual stimuli were presented during the behavioral session on a Samsung SyncMaster 2233RZ (Samsung, NJ, USA) LCD monitor (1680 × 1050 @ 120 Hz; see (Wang and Nikolic, 2011 (link))), during the imaging session on a Boxlight CD715X (Boxlight Corporation, WA, USA) DLP projector (1024 × 768 @ 75 Hz) and rear projection screen.
3
Eye Tracking Setup for Cognitive Experiments
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Stimuli were presented on an 18.5-in. monitor at a resolution of 1,024 × 768 pixels and with a refresh rate of 60 Hz. Eye movements were captured and recorded by an EyeLink 1000 Desktop Eye Tracking System (SR Research Ltd., Mississauga, ON, Canada). The system has a sampling rate of 1,000 Hz. The distance between monitor and chin rest was 60 cm. To ensure participants were at ease and to minimize unnecessary head movements, a chin rest was used. The experiment program was created using SR Research Experiment Builder software (version 1.10.165), which is compatible with the EyeLink 1000 eye tracker. Participants viewed the stimuli using both eyes, but only the position of the left eye was tracked and recorded. The eye tracker was calibrated using a series of nine fixed targets distributed around the display, followed by a nine-point accuracy test.
4
Eye Tracking Methodology and Calibration
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Eye movements were monitored using an Eyelink1000 eye tracking camera (SR Research, Ottawa, ON, Canada), which uses the same method of infrared pupil detection and corneal reflection to track eye movements as the Eyelink1000 + camera used in the current experiment. Eye movements were monitored monocularly from each participant’s dominant eye at 1000 Hz. As in the current experiment, the camera was mounted above the participants’ heads using a tower setup, the participants’ heads were stabilized with chin and forehead rests, calibration, and validation were completed using a nine-point fixation sequence, drift checks were performed before each trial, and the camera was recalibrated at the beginning of every block or if the error exceeded 1° of visual angle during a drift check. The average spatial error across all calibrations and participants was 0.49° of visual angle (SD = 0.13°).
5
Eye Tracking Protocol for Visual Stimulus
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In both experiments, eye movements were registered using the EyeLink 1000 Software, which was provided by SR Research GmbH (Canada). The samples were recorded at 500 Hz. Using an infrared light sensitive camera, the eye tracking device inferred the gaze position from the corneal reflex and the pupil location. At the beginning of the experiment, we presented a 9 point grid for calibration. The participant rested their chin on a head support and faced the 26-inch display (51 × 28 cm, resolution: 1920 × 1080 pixel). The distance between the eyes and the display was approximately 76 cm. For the stimulus, we used a 4 × 5 grid where each square measured 109 × 108 pixels. Together with the square brackets, measuring each 12 pixels in width, the stimulus was presented centrally and measured 462 × 566 pixels (approximately 14.1 × 15.1 cm, 10 × 12.20 degrees of visual angle).
6
Navigating Virtual Environments with Functional Imaging
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The acquisition session comprised one structural sequence and three functional sequences. The EcoSupermarketX paradigm was presented on an LCD monitor (48.5 × 87.8 cm, 1920 × 1080-pixel resolution, 60-Hz refresh rate) which the participants viewed through a mirror mounted above their eyes. The participants could actively navigate the scenario and select the response using a magnetic resonance-compatible joystick (Hybridmojo, San Mateo CA, USA). During the acquisition session, eye-tracking data (sample frequency of 1K) were recorded inside the scanner using Eyelink 1000 software (EyeLink 1000 Plus, SR Research, Mississauga, Ontario, Canada).
7
Multimodal Neuroimaging Protocol for Visual Processing
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We acquired in one session a structural MRI sequence and six fMRI sequences (a hMTþ functional localizer, four testing runs and a MAE control run -Fig. 1A) from all participants.
Stimuli were created in MATLAB R2016b (The Mathworks, Inc., Natick, MA-USA), along with the Psychophysics Toolbox version 3 (Brainard, 1997; (link)Pelli, 1997) (link), and were presented on an LCD screen (70 Â 39.5 cm, 1920 Â 1080 pixel resolution, 60 Hz refresh rate) which the participants viewed through a mirror mounted above their eyes at an effective distance of 156 cm. Participants' reports were recorded using a fiber-optical MR-compatible response box (Cedrus Lumina LSC-400B).
To confirm whether participants maintained central fixation during the acquisition session, individually calibrated eye tracking data (sample frequency of 500 Hz) were recorded inside the scanner using Eyelink 1000 software (SR Research, Ottawa, Ontario, Canada) .
The stimuli and the procedure used for each scanning run are described below.
Stimuli were created in MATLAB R2016b (The Mathworks, Inc., Natick, MA-USA), along with the Psychophysics Toolbox version 3 (Brainard, 1997; (link)Pelli, 1997) (link), and were presented on an LCD screen (70 Â 39.5 cm, 1920 Â 1080 pixel resolution, 60 Hz refresh rate) which the participants viewed through a mirror mounted above their eyes at an effective distance of 156 cm. Participants' reports were recorded using a fiber-optical MR-compatible response box (Cedrus Lumina LSC-400B).
To confirm whether participants maintained central fixation during the acquisition session, individually calibrated eye tracking data (sample frequency of 500 Hz) were recorded inside the scanner using Eyelink 1000 software (SR Research, Ottawa, Ontario, Canada) .
The stimuli and the procedure used for each scanning run are described below.
8
Eye Tracking Setup for Cognitive Studies
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An EyeLink 1000 (SR Research) eye tracker recorded participants’ eye movements by recording the infrared reflections from the cornea and pupil with a sampling frequency of 1000 Hz, and average spatial accuracy of 0.15°. Using the Desktop Mount set-up, participants’ heads were stabilized with a chin-rest positioned 90 cm from the display and 70 cm from the camera. The eye tracking camera was positioned directly in front of and beneath a 24-inch Dell Monitor with a resolution of 1920 × 1080 pixels, and 60 Hz refresh rate.
9
Visual Perception and Eye Movement Protocol
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Stimuli were presented using a back projection setup with a 91× 51 cm screen from Stewart Filmscreen, and PROPixx projector from VPixx Technologies with a resolution of 1920 × 1080, and refresh rate of 120 Hz. The screen was calibrated to ensure a linear gamma correction and background luminance was 92 cd/m2 at the screen centre. To minimise hot spots, we were using a screen material with a low gain and a large viewing angle. As a result, the background luminance was reduced by about 10% at an eccentricity of 15°, where the saccade target and all discrimination stimuli were presented. Viewing distance was 106 cm. Eye movements were recorded with an Eyelink 1000 (SR Research Ltd., Ontario, Canada) with a sampling rate of 1000 Hz. The experiment was presented in Matlab with custom written software using the Psychophysics Toolbox (Brainard, 1997 (link), Pelli, 1997 (link)). Participants responded using a standard keyboard and mouse.
10
Visual Perception Experiment Setup
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