eyelink - kys thuman.kyst.com.tw/upload/downloadfs22130703294254243.pdf · head-supported eye...

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EyeLink® 1000

> Extendable Core Hardware PlatformHead supported, fully remote, and non-human primate configurations > Focal Imaging TechnologyHigh resolution eye data without a limited camera field of view > IntegratedHighly integrated eye tracking equipment, experiment creation tools, and data analysis software

> EasyFast and simple participant setup, calibration, and validation > CompatibleWorks with Experiment Builder, E-Prime, Presentation®, and Psychtoolbox under Matlab®

> Multiple Programming InterfacesC/C++, Python, COM interfaces for Windows XP, OS X, and Linux

Extendable Hardware PlatformThe core of the EyeLink 1000 platform consists of custom developed high-speed imaging hardware and software. This core platform can be cost effectively extended in many different ways. The same camera allows multiple modes of highly accurate monocular and binocular recording with the head stabilized, at sampling rates up to 2000 Hz. In a fully remote 500 Hz configuration the viewer is free to move their head in a completely unrestrained environment.

Integrated Eye Tracking EquipmentSR Research provides highly integrated eye tracking equipment, experiment creation tools, and data analysis software for many areas of behavioral research.

This combined product set results in a complete eye tracking solution, allowing you to focus on your research goals, not on integrating different products from multiple vendors.

Focal Imaging TechnologyFocal imaging technology, unique to the EyeLink 1000 platform, provides extremely high resolution eye data without a limited camera field of view.

Robust eye tracking in conditions of moderate head movement allows for a less restrictive head restraint, making for quick and easy participant setup.

Overview

DataAnalysisSoftware

Experiment BuilderSoftware

and Cross Platform APIs

EyeLink Eye Tracking Systems(Head-Supported, Head-Mounted, and Remote)

EyeLinkPrimate

EyeLinkTower

EyeLinkRemote

EyeLinkDesktop

EyeLink1000

3rd Party Sof

twar

e

Data Viewer Software

Expe

rimen

t B

uilder Software

Programming Interfaces

www.sr-research.comSR Research

Head-S

upported

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Head-Supported Eye Trackers

0

-10

10Figure A

Calibrated PositionsUncalibrated Positions

0.5o

30%

20%

10%

0.5o 1.0o0

Figure B

Fixation Error

Figure B displays the fixation error histogram for the fixation set illustrated in Figure A.

Figure A displays a scatter plot of fixation accuracy using the EyeLink® 1000 system. Each point on the figure represents one fixation event. The inset plot is an enlarged view of the fixation distribution around the center target position.

EyeLink® 1000 Desktop

> Fastest Sampling RatesUp to 2000 Hz monocular and 1000 Hz binocular eye tracking > AccurateDrift free, down to 0.15º average accuracy (0.25º - 0.50º typical) > Real-timeAccess eye position data with < 2.0 msec delay > High Resolution0.01º RMS in pupil-CR 1000 Hz tracking mode

> Compact and Mirrorless MountNo electronics near participant’s head > EasyFast and simple participant setup, calibration, and validation > Complete Software SetIntegrated high performance experiment creation and data analysis tools > CompatibleWorks with Experiment Builder, E-Prime, Presentation®, and Psychtoolbox under Matlab®

IR Illuminator Camera AngleAdjustment

High-SpeedCamera

Pan / TiltAdjustment

Binocular Camera Rotation

The EyeLink® Desktop is a compact, mirror-less, mounting option for the EyeLink 1000 high-speed camera. The EyeLink Desktop mount sits just below the computer monitor the participant is viewing.

Head position can be maintained using our comfortable and robust chin and forehead rest, or with any 3rd party head stabilization device.


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Head-Supported Eye Trackers

Figure A displays a scatter plot of fixation accuracy using the EyeLink® 1000 system. Each point on the figure represents one fixation event. The inset plot is an enlarged view of the fixation distribution around the center target position.

EyeLink® 1000 Tower

> Fastest Sampling RatesUp to 2000 Hz monocular eye tracking > AccurateDrift free, down to 0.15º average accuracy (0.25º - 0.50º typical) > Real-timeAccess eye position data with < 2.0 msec delay > High Resolution0.01º RMS in pupil-CR 1000 Hz tracking mode > Large Eye Tracking Range55° Horizontal, 45° Vertical

> EasyFast and simple participant setup, calibration, and validation > Complete Software SetIntegrated high performance experiment creation and data analysis tools > CompatibleWorks with Experiment Builder, E-Prime, Presentation®, and Psychtoolbox under Matlab®

Focal imaging technology, unique to the EyeLink 1000 platform, provides extremely high resolution eye data without a limited camera field of view. Robust eye tracking in conditions of

moderate head movement allows for a less restrictive head restraint, making for quick and easy participant setup.

The EyeLink® Tower mount for the EyeLink 1000 high-speed camera uses an infrared mirror to optimize eye tracking range. The mirror is transparent to visible light but reflects the infrared light used to illuminate the participant’s eye.

Eye SelectionKnob

PaddedForehead Rest

PaddedChin Rest

IR ReflectiveMirror

Mirror AngleAdjustment

ExternalLight Baffling

IR IlluminatorHousing

1000Hz Infrared Camera

0

-10

10Figure A

Calibrated PositionsUncalibrated Positions

0.5o


Prim

ate Eye Tracker

www.sr-research.comSR Research 4

InfraredIlluminator Module

EyeLink 1000 /2K Camera

380.0mm (typ)

184.5mm (typ)

Hot Mirror

Eye

Virtual Eye

Primate Eye TrackerEyeLink® 1000 Primate

> Fastest Sampling RatesUp to 2000 Hz monocular and 1000 Hz binocular eye tracking > AccurateDrift free, down to 0.15º average accuracy (0.25º - 0.50º typical) > High Resolution0.01º RMS in pupil-CR 1000 Hz tracking mode > Coil ReplacementAnalog output option provides simple replacement for existing coil setups

> Integrated CalibrationDigital offset and gain adjustment of data from EyeLink host application > Real-timeAccess eye position data with < 2.0 msec delay > Hardware Interrupt Driven Data AccessAnalog output of eye position at rates up to 2000 Hz with less than 50 usec inter-sample jitter.

The EyeLink Primate system is designed for use in non-human primate research where extremely high temporal and spatial resolution is required. The EyeLink Primate system consists of our custom designed digital video camera and an IR illuminator module intended for mounting on the non-human primate restraining chair. Alternatively, our EyeLink Desktop mount can be used as a more turn-key mounting option. The EyeLink Primate system outputs eye position and pupil size in either digital or analog formats. Both outputs can be linearly calibrated using built in offset and gain adjustments. The offset and gain adjustment states can be saved and reloaded at a later date, allowing for easy switching between participants. It is also possible to calibrate using our built in 9 point and 13 point procedures for non-linear data calibration. One of the unique features to our analog output is its hard real-time scheduling, guaranteeing that each sample is updated on the analog output device with less than 50 usec of inter sample jitter. This provides a very consistent and accurate analog time base.

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Remote Eye TrackerEyeLink® Remote

> Accurate0.5 degree average accuracy > Fastest Remote Sampling Rate500 Hz monocular eye tracking > Head Free22x18x20 cm (horizontal x vertical x depth) allowable head movement at a 60 cm camera distance > Online Saccade DetectionReliably monitor fixation and saccade events of as little as one degree > Multiple Purpose Eye TrackerQuickly switch between Remote recording with the head unstabilized or highly accurate recording modes

> Real-timeAccess eye position data with 3.0 msec delay > Reliable Head Distance TrackingMaximum head movement speed of 100 cm / second, even during blinks > Robust Blink RecoveryRecovery time of 2 msec > Silent & StillNo attention-grabbing motorized parts to interfere with participant behavior

The EyeLink Remote system is designed for areas of eye tracking research where a head rest or head mount is not desirable but high accuracy and resolution are still important.

Head distance is accurately measured at 500 Hz using a small target sticker placed on the participant’s forehead. The use of a distance measure that is independent of the eye allows for head position to be tracked even during blinks, providing an extremely fast 2 msec blink recovery delay. The fast head position sampling rate also allows for head tracking during very quick head movements.

Eye PositionTracking

Head DistanceTracking


Rem

ote

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Remote Eye TrackerEyeLink® Remote

EyeLink Arm MountThe EyeLink Arm Mount affixes the EyeLink 1000 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. Combined with the Remote recording option, this solution is ideal for reaching viewers in difficult to record positions or where head restraint is simply not desirable.

Multi-purpose HardwareEyeLink Remote recording works with the EyeLink Desktop and EyeLink Arm Mounts so you can quickly and easily switch between eye tracking configurations by simply changing the camera lens and adding head support. This technological advance allows you to purchase multiple eye tracking systems in one.

The EyeLink Remote is more capable than merely monitoring fixation. The system's high resolution and accuracy provide reliable fixation saccade and blink event onset times and durations.

The real-time data access and excellent temporal resolution of the EyeLink Remote make it the ideal head-free remote eye tracker for gaze contingent and gaze controlled applications.

360˚ Rotation

Monitor Tilts Vertically& Swivels Horizontally 17” LCD

with Integrated Speakers

IR Illuminator

High-SpeedCamera

Range of Movement

-11 cm

0 cm (table top)

44 cm

Mounting OptionDesktop Mount Arm Mount

HeadStabilized

MonocularUp to 2000 Hz

MonocularUp to 2000 Hz

BinocularUp to 1000 Hz per eye N/A

No HeadStabilization

Remote OptionMonocular 500 Hz

Remote OptionMonocular 500 Hz


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An optical head-tracking camera integrated into the headband allows accurate tracking of the subject’s point of gaze without the need for a bite bar. The extremely low noise level of this optical tracker means that the noise level of computed gaze position data is comparable to that of the original eye position data, allowing gaze data to be used for saccadic analysis.

Head-Mounted Eye Tracker

EyeLink® II

> Fastest Head-Mounted Sampling Rate500 Hz binocular eye monitoring > Accurate< 0.5º average accuracy > Real-timeAccess eye position data with 3.0 msec delay > High Resolution0.01º RMS in pupil only tracking mode > VersatileHigh quality computer based or scene camera eye tracking

> EasyFast and simple participant setup, calibration, and validation > Complete Software SetIntegrated high performance experiment creation and data analysis tools > CompatibleWorks with Experiment Builder, E-Prime, Presentation®, and Psychtoolbox under Matlab®

The EyeLink II has the fastest data rate and highest resolution of any head-mounted video-based eye tracker. This exceptional data quality results in very low velocity noise, making the EyeLink II ideal for saccade analysis and smooth pursuit studies.

The EyeLink II system consists of three miniature cameras mounted on a comfortable padded headband. No mirrors are used in the EyeLink II system, making it very robust and easy to set up. Two eye cameras allow binocular eye tracking or easy selection of the subject’s dominant eye without any mechanical reconfiguration.


Head-M

ounted

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Head-Mounted Eye Tracker

Integrated Software Tool SetSR Research provides highly integrated experiment creation and data analysis software for use with the EyeLink II system.

This combined product set offers a complete software and hardware eye tracking solution, allowing you to focus more on your research goals and less on how to integrate different products from multiple vendors.

Real World Eye Tracking with Scene Camera OptionThe EyeLink II Scene Camera option records a participant’s eye position in relation to a video being captured by a forward facing head-mounted camera.

The Scene Camera extension turns the EyeLink II base system into a dual purpose eye tracker, capable of providing high quality computer monitor and real world based eye tracking.

Data AnalysisSoftware

Experiment BuilderSoftware

and Cross Platform APIs

EyeLink Eye Tracking Systems(Head-Supported, Head-Mounted, and Remote)

SceneLink, a software application included with the Scene Camera option, saves the scene video and eye data to a computer hard drive. The application provides real-time display of the eye position on the scene video as the data is being recorded. SceneLink can also be used to calibrate the eye tracker and playback the saved scene videos for analysis.Alternatively, the scene video with integrated gaze position overlay can be saved to any NTSC recording device supporting S-Video or composite (RCA) input.


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SR Research Ltd's Experiment Builder is a visual experiment creation tool designed to be easy to use while maintaining a high degree of flexibility, without compromising accuracy.

Software & AccessoriesExperiment Builder

> Visual Drag & Drop InterfaceLittle to no programming skills required > IntuitiveHierarchical experiment building block interface

> Precise TimingAccurate. Sub-millisecond precision with double-buffered video and audio support

> Screen BuilderBuilt-in 2D visual stimulus creation tool supporting shape primitives, images, and video clips

> Unicode SupportMultilanguage support throughout the application > ExtendableAdd custom Python code to extend experiments when required

> Integrated with EyeLinkSeamless integration with all models of the EyeLink® eye tracking system

> FlexibleSupport for simple to complex experimental paradigms; both with and without eye tracking

Experiment Builder integrates seam-lessly with the EyeLink hardware and software platform.

All output is tailored to provide Data Viewer with all the intimate details of your experiment for ease of making sense of complex data patterns.


Softw

are & A

ccessories

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Software & AccessoriesData Viewer

The EyeLink® Data Viewer is an intuitive tool that is used for viewing, filtering, and processing EyeLink gaze data.

Several different data viewing modes are available. A series of reporting tools are also provided that can be used to generate tab delimited data files for use in common statistical analysis packages. Report variables include interest area dwell time and fixation progression; first pass and regressive fixation measures, and hundreds more.

> Overlay ViewProvides eye event position and scan path visualization > Time Plot ViewSupports eye sample trace visualization > Playback ViewProvides temporal playback and movie export of recording with gaze position overlay > Area of Interest CreationCreate rectangular, elliptical, or free form interest areas

> Data ReportingOutput eye sample, fixation, saccade, interest area, or trial based reports for further statistical analysis > Reaction Time and Interest Period DefinitionCreate reaction time definitions for automatic trial by trial RT calculation and interest periods for temporal data filtering > Experiment Builder SupportHighly integrated with the SR Research Experiment Builder


www.sr-research.comSR Research11

Python

COM

Software & Accessories

The EyeLink® eye tracking systems can be integrated into several 3rd party software packages:

E-Primeby Psychology Software ToolsVia E-Basic access to COM interfacehttp://www.pstnet.com/products/e-prime/

Presentation®by Neurobehavioral SystemsVia Prexel interface developed by the Visual Attention Lab at UMass Bostonhttp://www.cs.umb.edu/~marc/prexel/

Matlab®using the Psychophysics Toolbox extensions (Brainard, 1997; Pelli, 1997)Via EyeLink Toolbox developed by Frans Cornelissen, Enno Peters, and John Palmerhttp://psychtoolbox.org/eyelinktoolbox/

Motion Monitorby Innovative Sports Training3D gaze calculation using the EyeLink IIhttp://www.innsport.com/eyelink_ii_3d_gaze.htm

SR Research offers a wide array of application programming interfaces, supporting several programming languages and operating systems.

Programming Interfaces

C / C++

3rd Party Software Integration

Softw

are & A

ccessories

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Software & Accessories

The EyeLink Gaze Overlay accessory converts the graphics from a computer monitor to a NTCS or PAL video stream. A cursor is drawn on the video representing the participant’s point of gaze on the display.

This option is used to provide gaze position information on a dynamic stimulus display, like a web browser, other computer applications, digital video, or DVD movie. The video signal is then typically saved onto a VCR or DVR recorder, but can also be saved to a computer using a S-Video to DV-AVI converter.

Video Overlay

S-Video OutVideo Out OverlayBox

ScanConverter

EyeLink®

HostComputer

Display Computer

Host Display

Note: Video Out can be S-Video or Composite Video to VCR or TV.

Gaze cursor canbe overlaid on any

video source


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Software & AccessoriesAnalog CardThe EyeLink® Analog Output accessory is used to output eye position and pupil size data as analog voltages. The native digital EyeLink eye data is converted to 16 bit analog signals in real-time using hardware interrupt driven processing. This ensures an extremely constant output duration for each analog sample.

The analog card features 16 bits of digital input and output, which can be used for the TTL triggering of recording start / end or synchronization of the digital eye data file with external devices.

Portable Host ComputerThe EyeLink Portable Host PC includes a lunchbox style chassis with an integrated 17.1" LCD monitor, keyboard, trackpad and speakers. The portable host is compatible with all EyeLink systems and accessories.

This rugged portable computer provides an easier to transport Host PC, complete with a luggable padded carrying case on wheels. Its small footprint takes up less valuable lab space, and it is the ideal solution when the EyeLink needs to be moved between multiple locations.

Dimensions:44cm Width x 34cm Height x 24cm Depth

(17 1/4" X 13.5" X 9.5")

Weight:15kg (33.2lbs; not including wheelie travel case)


Notes

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1 All 2000 Hz specifications (and 1000 Hz per eye binocularly) require purchase of the EyeLink 2K camera upgrade option.2 Pupil-Only tracking mode is available for use in head fixed conditions. EyeLink II uses hybrid only at 250 Hz.3 Measured with real eye fixations at multiple screen positions on a per subject basis. 4 Measured with a stationary artificial pupil.5 Time 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.6 Binocular tracking with Desktop Mount can reduce allowed head movement to approx. 25 mm Horizontal and Vertical.7 Custom builds are possible at up to 940 nm

EyeLink IIEyeLink 1000

Tower Mount PrimateMount

Desktop /Arm Mount Remote Option

Sampling Rate1

Monocular 250, 500 Hz 250, 500, 1000, 2000 Hz 250, 500 Hz

Binocular 250, 500 Hz Desktop / Primate Mounts:250, 500, 1000 Hz

Eye Tracking Principle2 Pupil Only (500Hz)Pupil with CR (250Hz)

Pupil with CR Pupil Only Pupil with CR Pupil with Corneal Reflection(CR)

Average Accuracy3 <0.5° typical down to 0.15° (0.25° to 0.5° typical) 0.5° typical

Saccade Event Resolution 0.05° microsaccades 0.5°

Spatial Resolution (RMS)4 0.01° Dark Pupil0.025° Pupil-CR mode

0.01° @ 1000 Hz0.02° @ 2000 Hz 0.1°

End to End Sample Delay5

M < 3.0 msecSD=1.11 msec

M < 1.8 msec, SD < 0.6 msec @ 1000 HzM < 1.4 msec, SD < 0.4 msec @ 2000 Hz

M < 3.0 msec,SD=1.11 msec

Blink Recovery Time 2 msec @ 500 Hz 1.0 msec @ 1000 Hz0.5 msec @ 2000 Hz 2 msec @ 500 Hz

Pupil Detection Models Centroid Centroid or Ellipse Fitting Ellipse Fitting

Gaze Tracking Range 40° horizontally36° vertically

60° horizontally,40° vertically

32 º horizontally,25 º vertically

Allowable Head Movement ±/-30° display ±25 mm horizontal or vertical6

±10 mm depth

22x18x20 cm(horizontal x

vertical x depth)

Optimal Camera-Eye Distance 40 - 80 mm 38 cm 30 – 45 cm 40 - 70 cm

Glasses Compatibility Excellent Good Excellent Good

Infrared Wavelength7 910 and 925 nm 910 nm 890 nm

EyeLink® Technical Specifications


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eyelink - kys thuman.kyst.com.tw/upload/downloadfs22130703294254243.pdf · head-supported eye...

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