Back to Basics SR1000 Manuel d'utilisateur

EyeLink® User Manual For EyeLink models: EyeLink 1000 EyeLink 2000 EyeLink Remote Tower, Desktop, Arm and Primate Mounts Version 1.4.0

Figure 1-1: Typical EyeLink 1000 Configuration (Tower Mount) All configurations of the EyeLink 1000 operate at the unparalleled low variability req

92 Data Files © 2005-2008 SR Research Ltd. 4.4.2.4 display coordinates (usually pixels) which can be set in the EyeLink 1000 configuration file PHYS

Data Files © 2005-2008 SR Research Ltd. 93 Pupil size measurements are affected by up to 10% by pupil position, due to the optical distortion of the

94 Data Files © 2005-2008 SR Research Ltd. EyeLink tracker, which timestamps the data and writes it to the EDF file. The application does not need p

Data Files © 2005-2008 SR Research Ltd. 95 4.5.3.1 4.5.3.2 Fixations Eye-movement events are always labeled by which eye generated the event. If bin

96 Data Files © 2005-2008 SR Research Ltd. 4.5.3.3 • The time of the first and last sample in the fixation • The eye that generated the event • Av

Data Files © 2005-2008 SR Research Ltd. 97 4.5.3.4 Saccades The EyeLink 1000 tracker's parser detects saccades by the velocity and acceleratio

98 Data Files © 2005-2008 SR Research Ltd. 4.5.3.5 Blinks In general, the saccadic amplitude will be slightly less than the distance between average

Data Files © 2005-2008 SR Research Ltd. 99 4.6.1 Sample Data The sample data written to the EDF file is controlled by the "file_sample_data&qu

100 Data Files © 2005-2008 SR Research Ltd. command. This is followed by a list of data types and options, selected from the list below: Keyword

Data Files © 2005-2008 SR Research Ltd. 101 file_event_filter = LEFT,RIGHT,FIXATION,BLINK,MESSAGE,BUTTON 4.7 EDF File Utilities A number of utility

Introduction © 2005-2008 SR Research Ltd. 3 1.1 Supporting Documents This document contains information on using the EyeLink 1000 hardware, the Host

102 Data Files © 2005-2008 SR Research Ltd. -e or -ns outputs event data only -nse blocks output of start events -nmsg blocks message event outpu

Data Files © 2005-2008 SR Research Ltd. 103 • START events mark the beginning of each recording block, and END events mark the end of each block. Th

104 Data Files © 2005-2008 SR Research Ltd. • Monocular, with resolution <time> <xp> <yp> <ps> <xr> <yr> • M

Data Files © 2005-2008 SR Research Ltd. 105 • MONOCULAR Corneal Reflection (CR) Samples "..." if no warning for sample first

106 Data Files © 2005-2008 SR Research Ltd. 4.9.3.3 4.9.3.4 Buttons 4.9.3 Event Line Formats Each type of event has its own line format. These use

Data Files © 2005-2008 SR Research Ltd. 107 4.9.3.5 4.9.3.6 Fixations 4.9.3.7 Saccades Block Start & End • START <time> <eye> <

108 Data Files © 2005-2008 SR Research Ltd. 4.9.3.8 Blinks • SSACC <eye> <stime> • ESACC <eye> <stime> <etime>

Data Files © 2005-2008 SR Research Ltd. 109 4.9.4 Data-Specification Lines Immediately following a START line, several lines of data specifications

110 Data Files © 2005-2008 SR Research Ltd. 4.10 Processing ASC Files An ASC file is a simple text file, and thus can be accessed by almost any pro

System Care © 2005-2008 SR Research Ltd. 111 5. System Care 5.1 Maintenance The EyeLink 1000 system should require little maintenance under normal us

4 Introduction © 2005-2008 SR Research Ltd. 1.2 EyeLink 1000 System Configuration 1.2.

112 Important Information © 2005-2008 SR Research Ltd. 6. Important Information 6.1 Safety 6.1.1 Eye Illumination Safety WARNING: Illuminators mu

Important Information © 2005-2008 SR Research Ltd. 113 In addition to its invisible light output, the illuminators and heatsinks may become warm duri

114 Important Information © 2005-2008 SR Research Ltd. 6.2 Servicing Information WARNING: Changes or modifications to camera, illuminators, or cable

Important Information © 2005-2008 SR Research Ltd. 115 6.2.3.1 6.2.3.2 Cables: Re-mount the new illuminator <instructions depend on the mount>,

116 Important Information © 2005-2008 SR Research Ltd. 6.2.4 Power Supply Replacement: WARNING: See the Specifications section for information on

Important Information © 2005-2008 SR Research Ltd. 117 6.3 Limited Hardware Warranty SR Research Ltd. 5516 Main St., Osgoode, Ontario, Canada K0A 2W

118 Important Information © 2005-2008 SR Research Ltd. Support representative. For product repairs, please contact your sales representative for app

Important Information © 2005-2008 SR Research Ltd. 119 All other company and / or product names are trademarks of their respective manufacturers. Pro

120 Appendix A: Using the EyeLink 1000 Analog and Digital Output Card © 2005-2008 SR Research Ltd. 7. Appendix A: Using the EyeLink 1000 Analog and

Appendix A: Using the EyeLink 1000 Analog and Digital Output Card © 2005-2008 SR Research Ltd. 121 Gaze: This is actual gaze position on the displ

Introduction © 2005-2008 SR Research Ltd. 5 • Real-time feedback of eye data is available on the Host PC during calibration or recording, allowing o

122 Appendix A: Using the EyeLink 1000 Analog and Digital Output Card © 2005-2008 SR Research Ltd. 7.3.2 Connections to Analog Card The analog card

Appendix A: Using the EyeLink 1000 Analog and Digital Output Card © 2005-2008 SR Research Ltd. 123 terminals on the connection board. Buttons and inp

124 Appendix A: Using the EyeLink 1000 Analog and Digital Output Card © 2005-2008 SR Research Ltd. ANALOG.INI). This allows operation with binocular

Appendix A: Using the EyeLink 1000 Analog and Digital Output Card © 2005-2008 SR Research Ltd. 125 • For gaze position data, the data range is scale

126 Appendix A: Using the EyeLink 1000 Analog and Digital Output Card © 2005-2008 SR Research Ltd. recording of a single eye-position sample. This w

Desktop Mount (Level) Desktop Mount (Angled) Figure 1-2. EyeLink 1000 Desktop Mount with Camera Level and Angled 1.2.3 EyeLink 1000 Camera Mount

The EyeLink 1000 Tower Mount (Figure 1-3) incorporates the camera and illuminator housing within a combined chin and forehead rest via an infrared ref

8 Introduction © 2005-2008 SR Research Ltd. The EyeLink 1000 Arm Mount (Figure 1-5) is a fully adjustable arm holding a 17” LCD monitor with the cam

Introduction © 2005-2008 SR Research Ltd. 9 1.3 System Specifications 1.3.1 Operational / Functional Specifications Desktop and Arm Mounts Tower Mo

1.4 Physical Specifications EyeLink 1000 Card Half-length PCI 140 mm long by 100 mm high. Eye Illumination CLASS 1 LED PRODUCT (IEC 60825-1 Ed.1.2:2

Introduction © 2005-2008 SR Research Ltd. 11 CLASS 1 LED DEVICE IEC 60825-1 (Ed. 1.2:2001) NOTE: This equipment has been tested and found to compl

Read instructions before use. US C Certified Entela Safety Mark: Compliance of this product with UL 60950 3rd Edition, CSA C22.2 N

12 EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. 2. EyeLink 1000 Host Application 2.1 Starting the Host Tracker Follow these simple s

when running the EyeLink 1000 as a standalone system. These output modes are not exclusive and include: a) Analog output. Using the optional analog ou

bar at the bottom. Arrows represent the navigations possible by key presses on the Host PC keyboard or via button selection using the Host PC mouse. A

Click “Set Options” for access to a variety of EyeLink 1000 options and settings on the Set Options screen. Note that any value on this screen can be

Figure 2-3 Set Options Screen 2.3.2.2 Set Options Screen Main Functions Select the Calibration Type for recording. The more locations sampled, cover

If enabled, requires the manual pressing of the spacebar or ENTER key on Host or Display PC in order to gather the sample when the subject is looking

Select whether to record eye events (fixations and saccades) in Gaze or HREF coordinate. GAZE is screen gaze x, y; HREF is head referenced-calibrated

Select the tracker configuration. Each configuration consists of the Camera Mount Type (Desktop, Arm Mount) with the Camera Mode or Orientation (Remot

Selecting Samples will record data samples to the EDF file, and selecting Events will record on-line parsed events. Keyboard Shortcuts: F = alterna

Clicking “Video Setup” goes to the Video Setup screen. Clicking “Enable Overlay” activates the video overlay option. Keyboard Shortcuts: V= toggle

© 2005-2008 SR Research Ltd. iii Table of Contents 1. Introduction ...

V Select to view video setup screen, if the overlay option is enabled. O toggle on/off video overlay option. F6 Select Record view (plot or gaze cu

Camera Setup Screen Main Functions 2.3.3.2 Click “Auto Threshold” to have the Host PC compute threshold levels automatically. Fine tuning may be neces

Toggles display of threshold coloring (blue for pupil, yellow for corneal reflection) in camera images. Keyboard Shortcuts: T = toggle ring in d

Tower Mount: Desktop Mount (Angled): Desktop and Arm Mounts (Level) /Remote (Level): Select the eye to track during recording. Here the Left eye is

26 EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. Click Help (F1) to access the online help page for Camera Setup. All available key sho

EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. 27 2.3.3.3 Camera Setup Screen Key Shortcuts Key Function ESC Go to the Offline screen

2.3.4 Calibrate Screen 28 EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. 2.3.4.1 Calibrate Screen Purpose Calibration is used to collec

Calibrate Screen Main Functions 2.3.4.2 Click to go to the Camera Setup screen. Keyboard Shortcuts: ENTER = Camera Setup Click to see Help and keyb

2.3.5 Validate Screen Figure 2-6 Validate Screen 2.3.5.1 2.3.5.2 Validate Screen Purpose The Validate screen displays target positions to the partici

Click to Restart the Validation process Click to automate the validation sequence according to the Pacing Interval from the Set Options screen.

iv © 2005-2008 SR Research Ltd. 3.2.6 Desktop Mount (Angled) Participant Setup, Binocular ... 62 3.3 Setting Pupil

2.3.6 Drift Correct/Drift Check Screen 32 EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. 2.3.6.1 Drift Correct/Drift Check Screen Pu

2.3.6.2 Drift Correct/Check Screen Main Functions Click to go to the Camera Setup screen. Keyboard Shortcuts: = ESC Click to view Help for the Drift

Figure 2-8 EyeLink 1000 Output Screen 2.3.7.2 Output Screen Main Functions Click to go to the Previous screen Keyboard Shortcuts: ESC = Previous

F Opens EDF File X Closes EDF File M Add a message to the EDF file. 2.3.8 Record Screen 2.3.8.1 Record Screen Purpose The Record screen allows d

The Plot View displays the x, y data traces as a function of time. The type of data to be plotted can be configured at the Set Options screen. Since r

position where the traces are displayed can be changed by clicking on the ⇑ and ⇓ buttons in the “Scroll” section. For RAW and analog outputs, the us

Selects zooming level (or use ALT + ⇑ and ALT + ⇓ keys). These buttons will only be available when the plotting data type is Gaze, Angle, or HREF. Ke

EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. 39 F On-line Offset correction. Plot Mode Only (Recording Screen). X or Y Data trace to

4) Click at the blank space next to the graph. A green marker will appear at intended value. For the ease of adjustments, you may set that point clos

of every experiment. A visual indicator, illustrated in the figure below, is present on the right hand side of the Calibrate, Validate, Drift Correct,

© 2005-2008 SR Research Ltd. v 4.4.4 Button Data...

42 EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. 2.5 Mouse Simulation Mode You can use a mouse on the EyeLink 1000 Host PC to simulate

EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. 43 BUTTONS.INI Hardware definition of buttons, special button functions. Preconfigured

44 EyeLink 1000 Host Application © 2005-2008 SR Research Ltd. If you plan to change the default settings in the .INI files, please copy and paste t

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 45 3. An EyeLink 1000 Tutorial: Running an Experiment The following tut

3.1 The Camera Setup Screen The first step in an eye-tracking session is to set up the participant and eye tracker. Begin by pressing ↵ (ENTER) on

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 47 Because all keys on the subject keyboard are sent to the EyeLink soft

Figure 3-2: Parts of the EyeLink 1000 Tower Mount then tighten the knob. Click on the “Camera Position Detect” button on the Camera Setup screen t

IMPORTANT: The height of the EyeLink 1000 Tower should not be adjusted when a subject is using the head support device! If the subject wears glasses

the pupil is detected, a green box and the cross now will be drawn on the eye image. If the image becomes too dark or too light, wait one second whil

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 51 every joint. Furthermore, the LCD display can be tilted forward or ba

vi © 2005-2008 SR Research Ltd. 7.3 Setting up the EyeLink 1000 Analog Card ... 121 7.3.1 Installing Analog

1) First, check whether the 35 mm lens (without a focusing arm or ring) has been installed. The 25 mm lens (with a long focusing arm) may be useful f

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 53 Ask the subject to be seated. Adjust the height of the chair so that

Figure 3-6. Camera Setup with Subjects Wearing Glasses (the EyeLink 1000 Monocular Mount). If the image becomes too dark or too light, wait one seco

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 55 By default, the “Illuminator Power” level is set to 75% at the recomm

destroy your .SCD file, a copy should be safely stored on the CDs you received with your EyeLink 1000. 4) The height of the Display PC monitor should

7) The EyeLink Remote uses a small target sticker placed on the participants’ forehead. This allows tracking of head position even when the pupil ima

58 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 8) Place one of the EyeLink Remote target stickers on the subject’s

overlaid with a blue threshold overlay. If the blue area in the display is interfering with setup, press the “Threshold Coloring” button (or ‘T’ on th

60 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 15) The operator can easily tell if the pupil has been detected beca

result, the recorded data will be noisy. If this happens, first check whether the subject is seated at the recommended eye-target distance of 550-600

© 2005-2008 SR Research Ltd. vii List of Figures Figure 1-1: Typical EyeLink 1000 Configuration (Tower Mount) ... 2 Figure 1-2.

62 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 3.2.5 Primate Mount Participant Setup, Monocular Most of the detai

the illuminator should be as close as possible to the lower edge of the visible part of the monitor for maximum eye tracking range. 6) Start the Ey

dotted line does not appear horizontally centered, move the Desktop Mount to the left or right or rotate the angle of the Desktop Mount slightly. Impo

Figure 3-15. Camera Setup with Subjects Wearing Glasses (Desktop Mount – Camera Angled). If the image becomes too dark or too light, wait one second

threshold may now be automatically set by pressing the ‘Auto Threshold’ button or the ‘A’ key when the camera image is selected. The pupil of the eye

In general, after threshold adjustment, pupil thresholds should be between 75 and 110 and corneal thresholds should not exceed 230. If the pupil thres

68 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. Follow the following steps to acquire the best CR: a) Press the Aut

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 69 height; ALT + ⇐ and ⇒ to adjust the width). The position of the searc

70 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. • Randomize target order: YES • Auto-trigger pacing: 1000 msec Pre

If automatic sequencing has been enabled, targets will be presented and fixations collected without further intervention. Each time a new target is di

viii © 2005-2008 SR Research Ltd. Figure 3-15. Camera Setup with Subjects Wearing Glasses (Desktop Mount – Camera Angled). ...

When the last calibration target has been presented, the calibration will be evaluated. At the bottom of the Calibration screen, each eye's calib

The pupil status error message “MISSING” highlighted in red, indicates that the pupil is missing from the camera view. This could be that the particip

74 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. To begin the validation procedure, select the “Validate” button or p

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 75 • Always ask the subject to look at the four corners of the display

76 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. subject’s inattention. Applications can create similar feedback disp

sending this as a command in your program. When the subject looks at the reference position, pressing ‘F9’ key on the Host PC or sending an “online_dc

78 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 3.13 EyeLink 1000 Setup Summary It is suggested that you try the pr

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 79 3.14 Experiment Practice The TRACK.EXE program is the most flexible w

80 An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. ii. Create a full-screen window, and send a series of commands to t

An EyeLink 1000 Tutorial: Running an Experiment © 2005-2008 SR Research Ltd. 81 The “Eyedata” template uses link data to display a real-time gaze cur

Introduction © 2005-2008 SR Research Ltd. 1 1. Introduction This section introduces the technical capabilities and supporting documentation for the E

82 Data Files © 2005-2008 SR Research Ltd. 4. Data Files The EDF file format is used by the EyeLink tracker and supporting applications to record ey

Data Files © 2005-2008 SR Research Ltd. 83 be used to record the time of a change in the display, or an experimental condition. 4.2 Recording EDF Fi

84 Data Files © 2005-2008 SR Research Ltd. 4.3.1 Parser Operation The parser uses velocity and acceleration-based saccade detection methods. Becaus

Data Files © 2005-2008 SR Research Ltd. 85 with EyeLink Data Viewer or convert the EDF file to an ASC file to see the correspondence between eye move

86 Data Files © 2005-2008 SR Research Ltd. detection of saccades as small as 0.3°, ideal for smooth pursuit and psychophysical research. A conservat

Data Files © 2005-2008 SR Research Ltd. 87 and other research, but may have to be raised if very rapid pursuit or nystagmus is being recorded. The l

88 Data Files © 2005-2008 SR Research Ltd. • Saccade extension. This is intended to allow the saccade period to include the lower-velocity start and

Data Files © 2005-2008 SR Research Ltd. 89 detection configurations into a new .INI file. Copy the original EDF file to the current EyeLink host dire

90 Data Files © 2005-2008 SR Research Ltd. 4.4.2.1 PUPIL 4.4.2.2 HREF Each sample may contain several data field, including: • Time of the sample (

eye(0,0)xyline ofsightf(x,y)HREF Plane The (x,y) positions define a point in a plane at distance f (15000 units) from the eye. The HREF units are inde