EyeLink 1000 Plus User manual

EyeLink
®
1000 Plus User Manual
Desktop, LCD Arm, Tower, Primate
and Long Range Mounts
Remote, 2000 Hz and Fiber Optic
Camera Upgrades
Version 1.0.12
Copyright ©2013-2017, SR Research Ltd.
EyeLink is a registered trademark of SR Research Ltd.,
Mississauga, Ontario, Canada

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©2013-2017 SR Research Ltd.
Read instructions before use.
For indoor use only.
Intertek Safety Mark: Compliance of this product with applicable
standards is certified by Intertek, an independent testing agency.
Separate electrical and electronic collection.
Illuminators comply with 60825-1 or 62471
safety standards. Refer to Chapter 6 of the User
Manual.
Fiber optic interface to OC camera head
complies with FDA and IEC laser safety
standards. Refer to Chapter 6 of the User
Manual.
FCC Statement:
NOTE: This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment can radiate radio frequency
energy and may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at the users’ expense.
CISPR WARNING: This is a Class A product. In domestic environments this product
may cause radio interference in which case the user may be required to take adequate
measures.
WARNING: Changes or modifications not expressly approved by SR Research Ltd. could
void the user’s warranty and authority to operate the equipment. This includes
modification of cables, removal of ferrite chokes on cables, or opening cameras or
connectors.
WARNING: Opening or modifying cameras and connector will void the warranty and
may affect safety compliance of the system. No user-serviceable parts inside - contact
SR Research for all repairs.
CLASS 1 LASER DEVICE
IEC 60825-1 (Ed. 1.2:2001)
CLASS 1 LED DEVICE
IEC 60825-1 (Ed. 1.2:2001)

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Caution – Using controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation exposure. Refer
to Chapter 6 of User Manual
This product complies with FDA performance standards for laser products, except for
deviations pursuant to Laser Notice No. 50, dated June 24, 2007.
CONTACT ADDRESS
SR Research Ltd
35 Beaufort Drive
Ottawa, Ontario, K2L 2B9
Canada
Fax:
[phone]
Phone:
[phone]
Toll Free:
1-866-821-0731 (North America only)
Email:
[e-mail]
Sales:
http://www.sr-research.com
Support:
http://www.sr-support.com

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©2013-2017 SR Research Ltd.
Table of Contents
1.!Introduction...............................................................................................................1!
1.1!Supporting Documents ......................................................................... 3!
1.2!EyeLink 1000 Plus System Configuration.............................................. 4!
1.2.1!Host PC...........................................................................................................4!
1.2.2!Display PC ......................................................................................................5!
1.2.3!EyeLink 1000 Plus Camera Mount Configurations .........................................6!
1.3!System Specifications ........................................................................... 9!
1.3.1!Operational / Functional Specifications...........................................................9!
1.3.2!Physical Specifications..................................................................................10!
2.!EyeLink 1000 Plus Host Software .........................................................................12!
2.1!Web UI Interface ................................................................................. 12!
2.1.1!File Manager .................................................................................................12!
2.1.2!Configuration Tool.........................................................................................17!
2.1.3!Tracker Initialization Files..............................................................................19!
2.1.4!Running Web UI on a computer other than the host PC...............................20!
2.2!Starting the Host Application .............................................................. 21!
2.3!Modes of Operation ............................................................................. 22!
2.4!EyeLink 1000 Plus Host PC Navigation ................................................ 23!
2.4.1!Camera Setup Screen...................................................................................24!
2.4.2!Offline Screen ...............................................................................................30!
2.4.3!Set Options Screen .......................................................................................32!
2.4.4!Calibrate Screen ...........................................................................................40!
2.4.5!Validate Screen.............................................................................................43!
2.4.6!Drift Check/Drift Correct Screen....................................................................45!
2.4.7!Output Screen ...............................................................................................46!
2.4.8!Record Screen ..............................................................................................48!
2.5!Status Panel ....................................................................................... 54!
2.6!Mouse Simulation Mode...................................................................... 55!
3.!An EyeLink 1000 Plus Tutorial: Running an Experiment....................................56!
3.1!The Camera Setup Screen ................................................................... 57!
3.2!Participant Setup ................................................................................ 58!
3.2.1!Desktop Mount Participant Setup, Monocular...............................................59!

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3.2.2!Desktop Mount Participant Setup, Binocular ................................................62!
3.2.3!Desktop Mount Participant Setup, Monocular Remote Mode .......................63!
3.2.4!Desktop Mount Participant Setup, Binocular Remote Mode.........................71!
3.2.5!LCD Arm Mount Participant Setup................................................................72!
3.2.6!Tower Mount Participant Setup, Monocular or Binocular..............................73!
3.2.7!Primate Mount Participant Setup, Monocular or Binocular ...........................76!
3.2.8!Long Range Mount Participant Setup, Monocular or Binocular ....................76!
3.3!Setting Pupil Thresholds ..................................................................... 79!
3.4!Setting the Corneal Reflection (CR) Threshold ..................................... 81!
3.5!Search Limits...................................................................................... 82!
3.6!Pupil Tracking Algorithm .................................................................... 82!
3.7!Calibration.......................................................................................... 83!
3.8!Validation ........................................................................................... 87!
3.9!Improving Calibration Quality ............................................................. 89!
3.10!Recording Gaze Position .................................................................... 90!
3.11!Drift Checking and Drift Correction................................................... 91!
3.11.1!Enabling Drift Correction.............................................................................91!
3.11.2!Online Drift Correction.................................................................................92!
3.12!Exiting the Host Application.............................................................. 95!
3.13!EyeLink 1000 Plus Setup Summary .................................................. 95!
3.14!Experiment Practice .......................................................................... 96!
3.15!Next Steps: Other Sample Experiments ............................................. 97!
4.!Data Files...............................................................................................................100!
4.1!File Contents .................................................................................... 100!
4.2!Recording EDF Files.......................................................................... 101!
4.2.1!Recording from the EyeLink 1000 Plus Host PC ........................................101!
4.2.2!Recording from the EyeLink API or SR Research Experiment Builder.......101!
4.3!The EyeLink On-Line Parser.............................................................. 101!
4.3.1!Parser Operation.........................................................................................101!
4.3.2!Parser Limitations .......................................................................................102!
4.3.3!EyeLink Parser Configuration .....................................................................102!
4.3.4!Parser Data Type ........................................................................................103!
4.3.5!Saccadic Thresholds...................................................................................103!
4.3.6!Pursuit Thresholds ......................................................................................104!

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4.3.7!Fixation Updates .........................................................................................104!
4.3.8!Other Parameters........................................................................................105!
4.3.9!Sample Configurations................................................................................105!
4.3.10!Reparsing EyeLink Data Files...................................................................106!
4.4!File Data Types ................................................................................. 107!
4.4.1!Samples ......................................................................................................107!
4.4.2!Position Data...............................................................................................107!
4.4.3!Pupil Size Data............................................................................................110!
4.4.4!Button Data .................................................................................................110!
4.5!Events .............................................................................................. 111!
4.5.1!Messages....................................................................................................111!
4.5.2!Buttons ........................................................................................................111!
4.5.3!Eye Movement Events ................................................................................112!
4.6!Setting File Contents......................................................................... 116!
4.6.1!Sample Data ...............................................................................................116!
4.6.2!Event Data ..................................................................................................117!
4.6.3!Event Types ................................................................................................117!
4.7!EDF File Utilities............................................................................... 118!
4.8!Using ASC Files ................................................................................ 118!
4.9!The ASC File Format ......................................................................... 119!
4.9.1!ASC File Structure ......................................................................................119!
4.9.2!Sample Line Format....................................................................................120!
4.9.3!Event Line Formats.....................................................................................123!
4.9.4!Data-Specification Lines .............................................................................126!
4.10!Processing ASC Files ....................................................................... 127!
5.!System Care..........................................................................................................129!
5.1!Maintenance ..................................................................................... 129!
5.2!Storage and Transportation............................................................... 129!
6.!Important Information ..........................................................................................130!
6.1!Safety ............................................................................................... 130!
6.1.1!Eye Illumination Safety................................................................................130!
6.2!Servicing Information ........................................................................ 131!
6.2.1!Non-Serviceable Components: ...................................................................132!
6.2.2!Illuminator Replacement: ............................................................................132!

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6.2.3!Cables and Lenses: ....................................................................................132!
6.2.4!Power Supply Replacement:.......................................................................133!
6.3!Limited Hardware Warranty .............................................................. 134!
6.4!Limited Software Warranty................................................................ 135!
6.5!Copyrights / Trademarks .................................................................. 136!
7.!Appendix A: Using the EyeLink 1000 Plus Analog and Digital Output Card ..137!
7.1!Analog Data Types ............................................................................ 137!
7.2!Analog Data Quality.......................................................................... 138!
7.3!Setting up the EyeLink 1000 Plus Analog Card ................................. 138!
7.3.1!Installing Analog Output Hardware .............................................................138!
7.3.2!Connections to Analog Card .......................................................................139!
7.3.3!Noise and Filtering ......................................................................................140!
7.4!Digital Inputs and Outputs ............................................................... 140!
7.4.1!Analog Data Output Assignments...............................................................141!
7.4.2!Analog Data Types and Ranges .................................................................141!
7.4.3!Scaling of Analog Position Data..................................................................142!
7.5!Pupil Size Data ................................................................................. 143!
7.6!Timebase and Data Strobe ................................................................ 143!
7.6.1!Strobe Data Input........................................................................................143!
7.6.2!Oversampling and Toggle Strobe ...............................................................144!

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List of Figures
Figure 1-1: Typical EyeLink 1000 Plus Configuration with a Desktop Mount .... 2!
Figure 1-2: EyeLink 1000 Plus Desktop Mount................................................. 6!
Figure 1-3: EyeLink 1000 Plus Binocular Tower Mount .................................... 6!
Figure 1-4: EyeLink 1000 Plus Primate Mount and Diagram of a Typical Setup 7!
Figure 1-5: EyeLink 1000 Plus LCD Arm Mount ............................................... 7!
Figure 1-6: Typical EyeLink 1000 Plus Long Range Mount Configuration.......... 8!
Figure 2-1: File Manager Screen..................................................................... 13!
Figure 2-2: Booting into the EyeLink Partition................................................ 21!
Figure 2-3: EyeLink 1000 Plus Host PC Application Overview ......................... 24!
Figure 2-4: Example Camera Setup Screen..................................................... 24!
Figure 2-5: Example Offline Screen ................................................................ 31!
Figure 2-6: Example Set Options Screen ........................................................ 32!
Figure 2-7: Example Calibrate Screen ............................................................ 41!
Figure 2-8: Example Validate Screen.............................................................. 43!
Figure 2-9: Example Drift Check/Drift Correct Screen.................................... 45!
Figure 2-10: Example EyeLink 1000 Plus Output Screen................................ 47!
Figure 2-11: Example Record Screen (Gaze Cursor View)................................ 49!
Figure 2-12: Example Record Screen (Plot View) ............................................. 49!
Figure 2-13: Gain/Offset Adjustments in the Plot View................................... 54!
Figure 2-14: EyeLink 1000 Plus Status Panel................................................. 54!
Figure 3-1: Example Camera Setup Screen (Desktop Mount). ......................... 57!
Figure 3-2: Parts of the EyeLink 1000 Plus Desktop Mount ............................ 60!
Figure 3-3: Camera Setup with Participants Wearing Glasses......................... 61!
Figure 3-4: Focusing the Desktop Mount Camera........................................... 62!
Figure 3-5: Camera Setup Screen Desktop Mount, Binocular Recording ......... 63!
Figure 3-6: Camera Setup Screen with the Monocular Remote Mode .............. 65!
Figure 3-7: EyeLink Remote Target Placement ................................................ 67!
Figure 3-8: Pupil and CR Thresholds and Bias Values .................................... 68!
Figure 3-9: Status Panel Pupil Size Information.............................................. 70!
Figure 3-10: Target and Eye Positions in the Thumbnail Camera Images ........ 71!
Figure 3-11 Camera Setup Screen with the Binocular Remote Mode............... 72!
Figure 3-12: Parts of the EyeLink 1000 Plus Tower Mount.............................. 74!

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Figure 3-13: Adjust the Chair Height for EyeLink 1000 Plus Tower Mount...... 75!
Figure 3-14: Focusing the Eye Camera for EyeLink 1000 Plus Binocular Tower
Mount ...................................................................................................... 76!
Figure 3-15: Adjusting the Camera Image Orientation .................................... 77!
Figure 3-16: Symptoms of Poor Pupil Threshold ............................................. 79!
Figure 3-17: Corner Effects Seen with Head Rotation ..................................... 80!
Figure 3-18: Corneal Reflection ...................................................................... 81!
Figure 3-19: Calibration Grid ......................................................................... 85!
Figure 3-20: Performing a drift correction using mouse click .......................... 93!
Figure 7-1 Screw Terminal Panel Pin Mapping Table .................................... 139!

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List of Tables
Table 1: EyeLink 1000 Plus Configuration Files.............................................. 20!
Table 2: Lens Guide for Different Viewing Distances ....................................... 40!
Table 3: Table of Recommended Distance from Illuminator........................... 131!
Table 4: Analog Channel Data Assignments for the EyeLink 1000 Plus hardware141!

Introduction
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1. Introduction
This section introduces the technical capabilities and supporting
documentation for the EyeLink®1000 Plus eye tracker. The EyeLink 1000 Plus
can be used in several configurations, each with its own strengths and
capabilities, allowing a single base system to suit a wide variety of research
applications. The same camera technology and software supports all
configurations, making the EyeLink 1000 Plus the most versatile solution for
eye and gaze monitoring available. Each EyeLink 1000 Plus configuration
shares the same application programming interface (API) and EyeLink Data File
(EDF) output, allowing experimenters to seamlessly switch between data
collection and analysis modes that best suit their particular experimental
paradigm or to accommodate different participant populations.
The EyeLink 1000 Plus high-speed camera has been designed to
interchangeably fit into different mounting options (with the exception that an
additional Fiber Optic Camera Head is required with the Long Range Mount).
This means that the purchase of a single Base System plus an array of mounts,
allows the same eye tracker to be used in a wide range of settings from high
precision recording in the laboratory with the head stabilized, through Remote
recording without head stabilization, to sensitive and specialized recording
environments like MRI or MEG settings. In all of these modes the
unprecedented low noise, stability and the world’s fastest sampling rates are
available. The EyeLink 1000 Plus is truly a multipurpose eye tracking solution.
The EyeLink 1000 Plus camera can be affixed to a Desktop Mount that provides
highly accurate monocular or binocular data acquisition at up to 2000 Hz (with
the 2000 Hz camera upgrade) using a chinrest. In addition, the cameras can be
configured in a redesigned Tower Mount that allows highly accurate monocular
or binocular recordings with a wide field of view when the participant’s head is
supported by a chin and forehead rest. A third mounting option is the LCD Arm
Mount that affixes the EyeLink 1000 Plus beneath an LCD monitor on a flexible
arm so that the entire eye tracking apparatus and display can be easily moved
into place in front of the viewer whose eyes are to be tracked. The Long Range
Mount with the Fiber Optic Camera can be used at distances up to 150 cm from
the eye for electromagnetic sensitive environments (e.g., EEG or MEG) or
environments where metal content needs to be minimized (e.g., MEG or MRI).
Finally, the Primate mount provides a mounting option for the camera so that
placement can be out of the way and above the participant, making it ideal for
use in animal recording situations.

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The Desktop and LCD Arm Mounts can be used in a highly flexible Remote
Mode (with the Remote Camera option) to record gaze position at up to 1000 Hz
without head stabilization. Combined with the LCD Arm Mount, Remote Mode
is ideal for reaching viewers in difficult to record positions as it brings the eye
tracker and display to the participant instead of making the viewer conform to
the setup required by the eye tracker. The fact that Remote recording operates
without head stabilization further increases the system’s flexibility.
Figure 1-1: Typical EyeLink 1000 Plus Configuration with a Desktop
Mount
All configurations of the EyeLink 1000 Plus operate at the unparalleled low
variability required for accurate gaze contingent paradigms, and the highly
accurate and sensitive operation that careful research demands. EyeLink
systems are the only modern equipment to run on a real-time operating system
for low variability and near-instant access to eye data measures. Although
Remote recording understandably has more noise than head stabilized
recording, it nevertheless continues to be highly accurate, though of lower
resolution. Compared to other remote systems on the market, the EyeLink
Remote operates at much higher acquisition rates (up to 1000 Hz), translating
into fewer missed data points, all with no moving parts to interfere with
stimulus delivery and invalidate the experimental setting.
A typical EyeLink setup is depicted in Figure 1-1. This figure illustrates the
Desktop Mount. The system consists of two computers – one, the Host PC is
dedicated to data collection. The second computer is referred to as the Display
PC, and is generally used for the presentation of stimuli to a participant. The

Introduction
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two computers are connected via an Ethernet link that allows the sharing of
critical information from the Host PC to the Display PC, such as the occurrence
of eye events, gaze position, or images from the camera during participant
setup. Similarly, the Display PC can communicate with the Host PC, allowing
Display PC applications to direct the collection of data. An optional EyeLink
button box can be attached directly to the Host PC allowing for the accurate
synchronization of participant responses with the eye movement data. Message
passing also allows events collected by I/O devices on the Display PC (e.g.,
button boxes, microphones, etc.) to be accurately recorded in the data file.
IMPORTANT: Please examine the safety information for the EyeLink 1000 Plus
system, found in Section 6.1.
1.1 Supporting Documents
The EyeLink 1000 Plus User Guide (this document) contains information on
using the EyeLink 1000 Plus hardware, the Host PC application, tutorials on
participant setup and calibration, and the basics of running an experiment.
Information on system safety, maintenance, and storage is also provided.
Appendix A of this manual explains the use of the optional analog output and
digital inputs and outputs via an analog card.
Additional documents are also available:
A. EyeLink 1000 Plus Installation Guide – Describes a standard EyeLink
1000 Plus system layout and environmental considerations as well as the
process followed to install the EyeLink 1000 Plus hardware and software on
both the Host and Display PCs.
B. EyeLink Programmer’s Guide – Provides suggestions on how to program
experiments with EyeLink 1000 Plus in Windows, including a review of sample
experiments and documentation of supported functions.
C. SR Research Experiment Builder User Manual – Introduces an optional
visual experiment creation tool for creating EyeLink experiments on 32-/64-bit
Windows and Mac OS X. This software allows for a wide range of sophisticated
experimental paradigms to be created by someone with little or no programming
or scripting expertise.
D. EyeLink Data Viewer User’s Manual – Introduces an optional Data
analysis tool, EyeLink Data Viewer, which allows interactive display, filtering,
extraction and summarizing of EyeLink EDF data.

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NOTE: Please be sure to check http://www.sr-support.com for product and
documentation updates as they become available.
1.2 EyeLink 1000 Plus System Configuration
1.2.1 Host PC
The EyeLink 1000 Plus Host PC performs real-time eye tracking at 250, 500,
1000, or 2000 samples per second1while computing true gaze position on the
display viewed by the participant. The Host PC also performs on-line detection
and analysis of eye-motion events such as saccades, blinks, and fixations. In
addition to the sample data, these events are stored in a data file on the Host
PC. They can be sent through the Ethernet link to the Display PC with a
minimal delay, or output as analog signals (if the optional analog/digital I/O
card is installed). From the Host PC, the operator performs participant setup,
monitors their performance, and can communicate with applications running
on a Display PC.
The Host PC:
•uses a timing-sensitive operating system allowing the eye tracker to
minimize delays in data acquisition and transmission and provide very
low data access variability.
•functions either as standalone eye tracker or connected to a Display PC
via Ethernet.
•communicates with the EyeLink camera using a Gigabit network
connection (through the onboard network card on a Laptop Host PC or a
dedicated add-on card on a Workstation Host PC). A workstation Host PC
can also house an optional analog output/digital input card.
•can operate in a standalone configuration, where data can be directed
through an optional analog output card and/or digitally stored on the
hard disk.
•supports an optional button box (USB or parallel port) for highly
accurate response recording synchronized with eye movement data.
•software integrates all the eye tracking functionality, including
participant setup, calibration, sending real-time data through an
Ethernet link or optional analog output card, and data recording.
•can be configured remotely via commands sent over the Ethernet link.
1Availability of some sampling rates depends on the mount type and system licensing.

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•can show real-time feedback of eye data during calibration or recording,
allowing other network devices to be devoted to accurate stimulus
delivery.
1.2.2 Display PC
The Display PC presents stimuli during experiments and, via the Ethernet Link,
can control key eye tracking functionality such as calibration, data collection,
etc. On-line eye and gaze position can be received from the EyeLink Host PC via
the Ethernet link making gaze-contingent paradigms possible. Licenses can be
acquired from SR Research for Experiment Builder, a sophisticated program
that assists researchers in creating EyeLink experiments on Windows and Mac
OS X without programming everything from scratch.
For users who wish to program their own experiments, a wide range of
programming options exist for assisting in automated data acquisition on the
Display PC. A C/C++ programming API with example code exists for Windows,
Mac OS X, and Linux. Additionally, third parties have made several freely
available methods to use the EyeLink with other software such as MATLAB (PC
and Mac OS X via the Psychtoolbox), Presentation, and E-Prime. Other
languages are supported as well, such as Python and anything with access to
the Windows Common Object Model (COM) interface. For full details and links
to downloadable resources, visit and join the SR Research support forums at
http://www.sr-support.com.
The Display PC:
•runs experiment application software to control the EyeLink 1000 Plus eye
tracker and present stimuli through the EyeLink programming API or SR
Research Experiment Builder, allowing development of countless
experimental paradigms.
•can configure and control the EyeLink tracker, and have access to real-
time data including gaze position, eye movement events, and response box
button presses with minimal delay and low variability in timing.
•runs applications focused on stimulus generation and control of the
experiment sequence. Relying on the Host PC for data acquisition and
registering responses makes millisecond-accurate timing possible, even
under Windows.
•supports data file viewing and conversion tools such as EyeLink Data
Viewer and EyeLink EDF2ASC converter, to assist researchers in deep
analysis of the data obtained.

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1.2.3 EyeLink 1000 Plus Camera Mount Configurations
The EyeLink 1000 Plus is available in five base hardware configurations
(Desktop, Tower, Arm, Primate and Long Range Mounts). These configurations
differ in the type of mounting used for the EyeLink 1000 Plus high-speed
camera and low output infrared illuminator module. The operation of the Long
Range Mount requires an additional Fiber Optic Camera Head.
Figure 1-2: EyeLink 1000 Plus Desktop Mount
The EyeLink 1000 Plus Desktop Mount (Figure 1-2) sits below the display that
the participant views during the experiment. Since the EyeLink 1000 Plus
camera and the infrared illuminator are near the stimulus display, no
electronics need to be near the participant’s head, and any head support can be
used. The Desktop Mount supports monocular, binocular, and Remote Mode
eye tracking at a variety of sampling rates, depending upon the licensing
options purchased.
Figure 1-3: EyeLink 1000 Plus Binocular Tower Mount

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The redesigned binocular-capable EyeLink 1000 Plus Tower Mount (Figure 1-3)
incorporates the camera and illuminator housing within a combined chin and
forehead rest via an infrared reflective mirror. The Tower Mount affords the
largest field of view of all mounting systems.
Figure 1-4: EyeLink 1000 Plus Primate Mount and
Diagram of a Typical Setup
The EyeLink 1000 Plus Primate Mount (Figure 1-4 left) houses the camera and
an infrared illuminator in a compact bracket that can be affixed to a vertical
surface such as a primate chair. The user supplies an infrared reflecting ‘hot
mirror’ to project the viewer’s eye to the camera. This allows accommodation of
a wide range of unique viewing setups with very small space requirements. A
typical setup appears in the diagram at the right side of Figure 1-4.
Figure 1-5: EyeLink 1000 Plus LCD Arm Mount

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The EyeLink 1000 Plus LCD Arm Mount (Figure 1-5) is a fully adjustable arm
holding a 17” LCD monitor with the camera and illuminator mounted beneath
it. When fixed on a sturdy table the entire apparatus can be moved in place in
front of the viewer to allow access to difficult-to-track populations, or simply to
hold the eye tracker at an appropriate height to accommodate viewers that vary
considerably in height.
Figure 1-6: Typical EyeLink 1000 Plus Long Range
Mount Configuration
The EyeLink 1000 Plus Long Range Mount (Figure 1-6) consists of a Base
holding a Mounting Bar to which a Long Range Illuminator and the Fiber Optic
Camera Head can be attached. The Mounting Bar can be affixed to a tripod or
the supplied Base at distances up to 150 cm from the eye. The entire apparatus
is designed to minimize metal content in an effort to provide unprecedented
monocular and binocular eye tracking capabilities in EEG/MEG and MRI
environments.

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1.3 System Specifications
1.3.1 Operational / Functional Specifications
Tower Mount
/Primate Mount
Desktop and LCD Arm Mounts
Base
System
Remote Tracking
(Remote Camera Upgrade required)
Average Accuracy1
Down to 0.15° (0.25° to 0.5° typical)
0.25-0.5° typical
Sampling rate2
Monocular: 250,500,1000,2000 Hz
Binocular: 250,500,1000,2000 Hz
Monocular: 250,500,1000 Hz
Binocular: 250,500,1000 Hz
End-to-End Sample Delay3
1000 Hz: M = 1.97 ms, SD = 0.39 ms
2000 Hz: M = 1.34 ms, SD = 0.20 ms
500 Hz: M = 3.29 ms, SD = 0.58 ms
1000 Hz: M= 2.19 ms, SD = 0.30 ms
Blink/Occlusion Recovery
1.0 ms @ 1000 Hz
0.5 ms @ 2000 Hz
2.0 ms @ 500 Hz
1.0 ms @ 1000 Hz
Spatial Resolution4
0.01°
Noise with Participants5
Filter (Off/Normal/High)
1000 Hz: 0.02°/ 0.01°/ 0.01°
2000 Hz (monoc): 0.03°/ 0.02°/ 0.01°
2000 Hz (binoc): 0.04°/ 0.02°/ 0.02°
Filter (Off/Normal/High)
500 Hz: 0.03°/0.02°/0.01° (25 mm lens)
0.06°/0.03°/0.01° (16 mm lens)
1000 Hz: 0.05°/0.03°/0.01° (25 mm lens)
0.08°/0.04°/0.02° (16 mm lens)
Eye Tracking Principle6
Dark Pupil - Corneal Reflection
Pupil Detection Models
Centroid or Ellipse Fitting
Ellipse Fitting
Pupil Size Resolution5
0.1% of diameter
0.2% of diameter (16 mm lens)
0.1% of diameter (25 mm lens)
Gaze Tracking Range
60° horizontally,
40° vertically
Customizable
Default is 32 º horizontally ×25º vertically
Allowed Head Movements
Without Accuracy Reduction
±25 mm horizontal or vertical
16 mm lens: 35×35 cm at 60 cm
40×40 cm at 70 cm
25 mm lens: 22×22 cm at 60 cm
25×25 cm at 70 cm
Optimal Camera-Eye Distance
Tower: 48 cm
Primate: 30 - 45 cm
40 - 70 cm
Infrared Wavelength
Tower: 940 nm
Primate: 910 /940 nm
850 to 940 nm
Glasses Compatibility
Good
Excellent
Good
On-line Event Parsing
Fixation / Saccade / Blink / Fixation Update
EDF File and Link Data Types
Gaze, Raw, and HREF eye position data/ Pupil size / Online events /
Buttons / Messages / Digital inputs
Real-Time Operator Feedback
Eye position gaze cursor superimposed on static image or position
traces with camera images and tracking status.
Specifications are preliminary and subject to change without notice.
1Measured with real eye fixations at multiple screen positions on a per subject basis.
2Availability depends on having the appropriate hardware and camera programming.
3Time from physical event until first registered sample is available via Ethernet or Analog output. Optional data
filter algorithm adds one sample delay for each filtering level.
4Measured with an artificial eye.
5Measured with real subject fixations.
6Pupil-Only tracking mode is available for use in head fixed conditions.

10
Introduction
©2013-2017 SR Research Ltd.
1.3.2 Physical Specifications
Physical
Anodized aluminum enclosure.
GL (EyeLink 1000 Plus
Camera)
Standard thread (¼”-20) centered on optical axis from 3 sides.
M8 thread on front for DM and AM mounts.
Power requirements: +12VDC, 800 mA for camera alone, 1.8A maximum
when used with illuminator(s).
Imaging rates up to 2000 fps.
OC (Fiber Optic Camera
Head)
M3 tapped holes on body.
Adapter for ¼”-20 mounting available.
Supply: 3.6-5.7VDC, 700mA via LEMO connector and power harness.
Imaging rates up to 2000 fps.
Non-magnetic (< 0.5g of iron or nickel).
Radio-quiet case and cable design for use in research environments.
FL-890, FL-940
(890/940 nm Fresnel
Illuminator Module)
Standard thread (¼”-20) at center and sides.
Adjustable focus and beamwidth.
Wavelength: 890 or 940 nm.
Supply: 3.6-5.7VDC, 1.1A via LEMO connector and power harness.
Non-magnetic (< 0.5g of iron or nickel).
Radio-quiet case and cable design for use in research environments.
PM-910, PM-940
(910/940 nm
Illuminator Module)
Wavelength: 910 or 940 nm.
Eye illumination level: less than 1 mW/cm²at >200mm from illuminator.
Illuminators powered from camera through supplied cables.
DM-850W, DM-850L,
DM-890, DM-940,
AM-890, AM-940 (DM
and AM Series
Illuminators)
Wavelength: 850 to 940 nm.
Eye illumination level: less than 1 mW/cm²at >450mm from illuminator.
Powered from camera via integrated cables.
Camera Ethernet
Cabling: Unshielded CAT5e or CAT6 cables up to 30 meters in length.
Requires host computer with supported Ethernet hardware capable of
gigabit speeds.
Power Supply
Specifications
GL camera: 12VDC, 2A external power supply with 2.5mm coaxial
(“barrel”) power connector (5.5 ×2.5 ×9.5mm).
OC camera head and FL illuminator: 3.6-5.6VDC@2A minimum. When
used with supplied power harness, DB-9 connector is required (contact SR
Research for pinout).
Power supply must have EN 60950, UL 950, CSA 22.2 No. 950, or other
equivalent safety approval, with LPS or Class 2 rating.
Operating conditions
10°C to 30°C, 10%-80% humidity (non-condensing)
For indoor use only.
Storage conditions
-10°C to 60°C, 10%-90% humidity (non-condensing). Allow to warm to
room temperature before unpacking or use after storage at temperatures
below 10°C to prevent condensation.
Safety Standards
IEC 60950-1:2005 (2nd Ed.) + Am 1:2009
IEC 60825-1:1993 + A1:1997 + A2:2001
IEC 62471:2006 (1st Ed.)
FDA 21 CFR laser products, under Laser Notice No. 50.
Fiber Optic Link (GL
and OC modules)
Class 1 laser product, IEC 60825, CFR 21
850 nm, multimodal duplex fiber, LC connector.
Electromagnetic
compatibility and
immunity
FCC Part 15, Subpart B: Class A unintentional radiators (see statement
below)
CISPR 11:1997 and EN55011:1998 -- Class A