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EyeLink
II Headband |
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Two eye cameras for binocular
tracking or instant selection of single eye to be tracked. |
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Optical head tracking camera
with exceptionally low angular noise. |
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Off-axis illumination and high-contrast
cameras for maximum compatibility with eyeglasses and contact lenses. |
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Lightweight headband (~420g)
has a low center of mass for stability, is well-balanced and has low
rotational inertia. This reduces neck muscle tremor and permits long
periods of use without fatigue. |
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Padded
headband provides excellent grip on skin with low pressure, wicks
away moisture for comfort, and is not affected by skin oils. |
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All mechanical adjustments and
sliding parts have been wear-tested to ensure long lifetime with no
maintenance. |
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No mirrors used
for light weight and robustness. |
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Subject
Display with Markers |
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Infrared Markers
are used by head camera to compensate for head movements during eye
recording. |
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High refresh rate
monitor recommended (should be capable of 100 Hz at 1024x768 or higher,
and at least 160 Hz at 640x480 resolution). |
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The four infrared
markers are mounted on corners of display (adhesive Velcro patches
supplied). |
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Projector may be
used, but may require special marker set. |
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Maximum 120 cm from
subject with standard marker set (140 cm if markers are tilted toward
subject).
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Recommended distance
from subject is twice width of display area (display subtends 30°
horizontally and 22.5° vertically). |
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EyeLink
II Card |
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Processed eye camera and head
camera data. |
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Has headband, marker, and Ethernet
connectors. |
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Sends samples and events to Display
PC in real-time |
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Power requirements: +5V (2A),
+12V (0.8A), -12V (0.2A) |
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Half-size PCI card (6.8"
(176mm) long by 4.2" (107mm) high.
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EyeLink
Host PC |
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Hosts EyeLink II card, optional
analog output/digital input card. |
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Real time data output through
Ethernet |
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Special operating system installed
to host EyeLink II software-original operating system (such as Windows XP Professional Service Pack 1) is still available, if disk partitioning utility (included with
self-installation kit) is used during installation. |
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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. |
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Response box or game pad connected
by game port, printer port, digital input card, or USB port. |
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Keyboard, display, and pointing
device are used to control tracker or as remote keyboard for applications
on display computer. |
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In standalone configuration,
data output is to hard disk or through optional analog output card.
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5 meter cable to headband, 7
meter cable to markers (mounted on subject display). |
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Display has real-time feedback
of eye data during calibration or recording, freeing display computer's
monitor for calibration target and stimulus presentation |
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Functions either as standalone
tracker or connected to display computer through 10BASE-T Ethernet
cable. |
Related Information: PC
Recommendations
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Display
Computer |
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Software developer's kits for
Windows, MS-DOS and Macintosh include the EyeLink API (application
programming interface), documentation and sample source code in C
for a number of experimental paradigms. (NOTE: future development
will focus on the Windows operating system). |
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Applications need only support
display generation and control of the experiment sequence, and should
rely on the tracker for creating the data file and reading the response
box. This makes millisecond-accurate display timing possible, even
under Windows. |
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All communication is through
the Ethernet link via EyeLink library (Windows and Macintosh) or TSR
(MS-DOS). |
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Runs experiment application software
for control of EyeLink II tracker and stimulus presentation. |
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Applications can configure and
control the EyeLink tracker, and have access to real-time data including
gaze position, response box button presses, and keyboard. |
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Some information will be available
in the future for programmers who wish to access parts of the EyeLink
interface on other platforms. |
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