EyeLink II Manuale utente

EyeLink

II Head Fixed Eye Tracker

User Manual

Version 2.12

EyeLink is a registered trademark of SR Research Ltd, Mississauga, Canada.

Table of Contents

1. Introduction ........................................................................................................... 1

1.1 Supporting Documents......................................................................... 1

1.2 EyeLink®II System Overview ................................................................ 2

1.3 EyeLink II System Configuration .......................................................... 2

1.3.1 EyeLink II Host PC ........................................................................................ 3

1.3.2 EyeLink II Display PC.................................................................................... 3

1.3.3 EyeLink II PCI Card....................................................................................... 5

1.4 System Specifications........................................................................... 5

1.4.1 Tracking Modes ............................................................................................. 5

1.4.2 Operational / Functional Specifications ......................................................... 5

1.4.3 Physical Specifications.................................................................................. 6

2. EyeLink II Tracker Application Operation ........................................................... 8

2.1 Starting the Host Tracker ..................................................................... 8

2.2 Modes of Operation .............................................................................. 8

2.3 EyeLink II Tracker Application Navigation............................................. 9

2.3.1 Offline Screen.............................................................................................. 10

2.3.2 Camera Setup Screen ................................................................................. 12

2.3.3 Set Options Screen ..................................................................................... 16

2.3.4 Calibration Screen ....................................................................................... 21

2.3.5 Validation Screen ........................................................................................ 23

2.3.6 Drift Correct Screen..................................................................................... 25

2.3.7 Output Screen ............................................................................................. 27

2.3.8 Record Screen............................................................................................. 29

2.4 Status Panel....................................................................................... 31

2.5 Mouse Simulation Mode ..................................................................... 32

2.6 Configuration Files and Experiment Directories .................................. 32

2.7 Analog Data Types.............................................................................. 33

3. An EyeLink II Tutorial: Running an Experiment ............................................... 35

3.1 The Camera Setup Screen .................................................................. 36

3.2 Adjusting Eye Camera Position ........................................................... 37

3.3 Setting Pupil Threshold ...................................................................... 40

3.4 Calibration......................................................................................... 42

3.5 Validation .......................................................................................... 47

3.6 Recording Gaze Position ..................................................................... 49

3.7 Drift Correction .................................................................................. 49

3.8 Exiting EyeLink II............................................................................... 51

3.9 EyeLink II Setup Summary................................................................. 51

3.10 Experiment Practice ........................................................................ 52

3.11 Next Steps: Other Sample Experiments............................................ 52

4. Data Files ............................................................................................................. 56

4.1 File Contents...................................................................................... 56

4.2 Recording EDF Files........................................................................... 57

4.2.1 Recording from the EyeLink II Host PC....................................................... 57

4.2.2 Recording from the EyeLink API ................................................................. 57

4.3 The EyeLink On-Line Parser ............................................................... 57

4.3.1 Parser Operation ......................................................................................... 57

4.3.2 Parser Limitations........................................................................................ 58

4.3.3 EyeLink Parser Configuration...................................................................... 58

4.3.4 Parser Data Type ........................................................................................ 59

4.3.5 Saccadic Thresholds ................................................................................... 59

4.3.6 Pursuit Thresholds ...................................................................................... 60

4.3.7 Fixation Updates ......................................................................................... 60

4.3.8 Other Parameters ........................................................................................ 61

4.3.9 Sample Configurations ................................................................................ 61

4.4 File Data Types .................................................................................. 62

4.4.1 Samples....................................................................................................... 62

4.4.2 Position Data ............................................................................................... 63

4.4.3 Pupil Size Data............................................................................................ 66

4.4.4 Button Data.................................................................................................. 66

4.5 Events ............................................................................................... 66

4.5.1 Messages .................................................................................................... 67

4.5.2 Buttons ........................................................................................................ 67

4.5.3 Eye Movement Events................................................................................. 67

4.6 Setting File Contents .......................................................................... 71

4.6.1 Sample Data................................................................................................ 72

4.6.2 Event Data................................................................................................... 72

4.6.3 Event Types ................................................................................................ 73

4.7 EDF File Utilities ................................................................................ 73

4.7.1 EDFSCAN ................................................................................................... 74

4.8 Using ASC Files.................................................................................. 74

4.8.1 EDF2ASC .................................................................................................... 75

4.8.2 Translator Options ....................................................................................... 75

4.9 The ASC File Format .......................................................................... 78

4.9.1 ASC File Structure....................................................................................... 78

4.9.2 Sample Line Format .................................................................................... 79

4.9.3 Event Line Formats ..................................................................................... 82

4.9.4 Data-Specification Lines.............................................................................. 84

4.10 Processing ASC Files ....................................................................... 86

4.11 An ASC File Processing Program ...................................................... 86

5. Troubleshooting .................................................................................................. 88

Problem: Eye Camera Images are blank or blue.......................................... 88

Problem: LED Warning on Host PC startup ................................................. 88

Problem: Host PC Warning Message or Image Loss ...................................... 88

6. System Care......................................................................................................... 90

6.1 Maintenance ...................................................................................... 90

6.2 Storage and Transportation ................................................................ 91

7. Important Information ......................................................................................... 93

7.1 Safety ................................................................................................ 93

7.1.1 Electrical Isolation Safety ............................................................................ 93

7.1.2 Eye Illumination Safety................................................................................ 93

7.2 Limited Hardware Warranty ............................................................... 94

7.3 Limited Software Warranty ................................................................. 95

7.4 Copyrights / Trademarks ................................................................... 95

8. Appendix A: Using the EyeLink II Analog and Digital Output Card................ 96

8.1 Analog Data Quality ........................................................................... 96

8.2 Setting up the EyeLink II Analog Card ................................................ 97

8.2.1 Installing Analog Output Hardware.............................................................. 97

8.2.2 Connections to Analog Card........................................................................ 97

8.2.3 Noise and Filtering ...................................................................................... 97

8.3 Digital Inputs and Outputs................................................................. 97

8.3.1 Analog Data Output Assignments ............................................................... 98

8.3.2 Analog Data Types and Ranges.................................................................. 99

8.3.3 Scaling of Analog Position Data .................................................................. 99

8.4 Pupil Size Data................................................................................. 100

8.5 Time base and Data Strobe............................................................... 100

8.5.1 Strobe Data Input ...................................................................................... 101

8.5.2 Over sampling and Toggle Strobe............................................................. 101

List of Figures

Figure 1-1: Typical EyeLink II System Configuration ........................................ 2

Figure 2-1: Screen Overview of EyeLink II Tracker Program............................. 9

Figure 2-2: EyeLinkII Offline Screen............................................................... 10

Figure 2-3: EyeLink II Camera Setup Screen .................................................. 12

Figure 2-4: EyeLinkII Set Option Screen ....................................................... 16

Figure 2-5: EyeLink II Calibration Screen....................................................... 21

Figure 2-6: EyeLinkII Validation Screen ......................................................... 23

Figure 2-7: EyeLinkII Drift Correction Screen................................................. 25

Figure 2-8: EyeLinkII Output Screen.............................................................. 27

Figure 2-9: EyeLinkII Record Screen .............................................................. 29

Figure 2-10 EyeLink II Status Panel............................................................... 31

Figure 3-1: Example Camera Setup Screen before Camera Setup. .................. 36

Figure 3-2: Size and Vertical Eye Camera Adjustments ................................. 38

Figure 3-3: Horizontal Adjustments of Eye Camera ....................................... 39

Figure 3-4: Focusing the Eye Camera ........................................................... 40

Figure 3-5: Symptoms of Poor Pupil Threshold.............................................. 41

Figure 3-6: Corner Effects Seen with Head Rotation ...................................... 42

Figure 3-7. Calibration Grid following a Good and Poor Calibration ................ 45

Figure 3-8. Performing an online drift correction with mouse click ................. 51

Read instructions before use.

Type BF equipment (applied parts):

Metal parts connected to chassis of computer may

contact user. Compliance with 601-1 medical

equipment standards requires use of a medical grade

power supply.

Entela Safety Mark: Compliance of this product with

UL 2601-1, CSA C22.2 N0.601.1 and IEC 60601-1 is

certified by Entela, an independent testing body.

CONTACT ADDRESS

SR Research Ltd.

5516 Main St., Osgoode, Ontario, Canada K0A 2W0

Fax: 416-352-5376

Phone: 613-826-2958

Toll Free Phone: 1-866-821-0731 (North America Only)

http://www.eyelinkinfo.com/

1. Introduction

This section introduces the EyeLink II system, technical capabilities, and

supporting documentation.

IMPORTANT: Be sure you have read and agree to the end user license

agreement provided in section 7.2 of this document before using the EyeLink II

system.

NOTE: Please be sure to check http://www.eyelinkinfo.com/news.php for

product and documentation updates as they become available.

1.1 Supporting Documents

This document contains information on using the EyeLink II system; host PC

application, subject setup and calibration, and the basics of running an

experiment. Information on system safety, maintenance, and storage is also

provided. The Appendix A of the current manual explains the use of analog

output and digital inputs and outputs via a DT334 card, if purchased.

Additional documents are also available:

A. EyeLink II Installation Guide – Describes a standard EyeLink II system

layout and environmental considerations as well as the process followed

to install the EyeLink II hardware and software on both the Host and

Display computers.

B. Windows Programmers Guide – Provides suggestions on how to program

experiments with EyeLink II in Windows, including review of all sample

experiments provided for Windows. Document also details the EyeLink II

Windows API.

C. EyeLink Data Viewer User’s Manual – Introduces an optional Data

analysis tool, EyeLink Data Viewer, which allows the displaying, filtering,

and outputting of EyeLink I and EyeLink II EDF data.

D. EyeLink II Scene Camera User Manual – Provides introduction to an

optional tool, EyeLink II Scene Camera, with which the users can track

gaze position on a real world scene video being captured from a head

mounted scene camera.

E. EyeLink II Gaze Overlay User Manual. The optional Gaze Overlay device

works with the EyeLink II system to generate a real-time gaze overlay

graphic on an S-Video source. This option is often used to provide a gaze

overlay onto a dynamic moving scene such as non-static website, AVI file,

or DVD movie, etc. This PAL/NTSC composite or S-Video signal is then

typically saved onto a VCR or DVD recorder for analysis.

1.2 EyeLink

II System Overview

Video-based eye tracking systems have long been acknowledged as the simplest

to set up and operate. However, these systems also had a reputation for low

data rates, poor spatial resolution, high noise, and frequent loss of data. The

EyeLink technology changed all of this with custom-built high-speed cameras

and hyperacuity image processing. EyeLink II has the highest resolution (noise-

limited at <0.01°) and fastest data rate (500 samples per second) of any other

video-based eye tracker today. This exceptional data quality results in very low

velocity noise, making the EyeLink II ideal for saccade analysis and smooth

pursuit studies. On-line gaze position data is available with delays as low as 3

milliseconds, making the system ideal for gaze-contingent display applications.

In addition, on-line data parsing occurs, making eye events such as saccade,

fixation, and blink available within 25 ms to the display computer.

The EyeLink II system consists of two miniature cameras which are mounted

onto a head restraint. 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 the mechanical

reconfiguration required by most eye trackers. Each camera has built-in

illuminators, digitally corrected for even lighting of the entire field of view.

Together with digital compensation for changes in ambient lighting, this results

in exceptionally stable pupil acquisition.

SR Research is committed to developing EyeLink-based applications to support

most eye-tracking research applications, and will make available software-

development tools for using the EyeLink II data-link and file formats. We will

keep you informed of improvements in documentation and availability of these

tools.

1.3 EyeLink II System Configuration

Figure 1-1: Typical EyeLink II System Configuration

1.3.1 EyeLink II Host PC

The EyeLink II Host PC performs real-time eye tracking at 250 or 500 samples

per second, while also computing true gaze position on the subject display. On-

line detection analysis of eye-motion events such as saccades and fixations is

also performed. This data can be stored in a data file on the Host PC, sent

through the Ethernet link to the Display PC, or output as analog signals (if the

analog/digital I/O card is installed). From the Host PC, the operator performs

subject setup, monitors performance, and can control applications running on

the Display PC. The Host PC has these key attributes:

•Hosts EyeLink II high-speed eye tracking card, optional analog

output/digital input card.

•Runs a special operating system to host the EyeLink II operator

software. Your original operating system (such as Windows XP) is still

available, if disk the partitioning utility (included with self-installation

kit) is used during installation.

•Functions either as standalone tracker or connected to display computer

through 10BASE-T Ethernet cable.

•In standalone configuration, data output is to hard disk or through

optional analog output card.

•Response box or game pad connected by a USB port.

•Keyboard, display, and pointing device are used to control tracker or as

remote keyboard for applications on display computer.

•EyeLink II software integrates all needed eye tracking functionality,

including subject setup, calibration, real-time data through Ethernet

link or optional analog output card, and writing of data to hard disk.

•Display has real-time feedback of eye data during calibration or

recording, freeing display computer's monitor for calibration target and

stimulus presentation.

•Data File viewing and conversion tools

1.3.2 EyeLink II Display PC

The EyeLink II Display PC provides displays for experiments, and calibration

targets during eye-tracker calibrations. On-line eye and gaze position can be

received from the EyeLink Operator PC via the Ethernet link. Sample

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