User manual

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 while the auto-

contrast adjusts itself. If the blue thresholded area in the display is interfering

with setup, press the “Threshold Coloring” button (or ‘T’ on the keyboard) to

remove the threshold color overlay. In TRACK.EXE, you can use keys on either

the Display or Host PC to perform all keyboard shortcut operations while the

eye image is displayed.

The camera should be focused by rotating the focusing arm slowly. Look closely

at the eye image on the zoomed view while adjusting the position of the focusing

arm until the eye image is crispy. If a yellow circle (CR signal) appears near the

pupil, the best focus will minimize the size this yellow circle. Now proceed to

section 3.3 “Setting Pupil Threshold”.

Focusing Arm

Poor Focus

Good Focus

Figure 3-4: Focusing the Eye Camera for EyeLink

1000 Tower Mount

3.2.2 Using the Arm Mount – Positioning the Apparatus

The EyeLink 1000 Arm Mount works in conjunction with highly accurate

monocular recording with the head stabilized or higher variability recording

where the head is free to move in Remote mode (licensing required). Regardless,

of the recording mode, positioning the Arm requires similar considerations.

Once the Arm is in position, steps to take to collect good data are identical to

those of the other mounts.

To position the Arm simply grab the entire apparatus by one or both of the

handles located on either side of the LCD display and pull it into position. Note

that the Arm can swing completely around, move up and down, and bend at

50 An EyeLink 1000 Tutorial: Running an Experiment