User manual

62 An EyeLink 1000 Tutorial: Running an Experiment

3.2.5 Primate Mount Participant Setup, Monocular

Most of the details for Primate Mount setups are detailed in the Installation

Guide. Once a physical setup is established, there is unlikely to be much

variation in the steps taken to track eye movements as there is generally little

variability in the view of the eye or the participants.

The software configuration steps for use of the Primate Mount are similar to the

Tower Mount with the exception that the primate mount allows monocular and

binocular recording, whereas the Tower Mount is limited to monocular

recording. Similarly, while the Tower Mount is limited in its use of a single 25

mm lens, users of the Primate Mount may wish to use the 16 or 25 mm lens

according to the table below.

Lens (focal length) Distance (Camera Front to Eye) Field of View

16 mm 240-280 mm 85 x 65 mm

25 mm 350-400 mm 85 x 65 mm

3.2.6 Desktop Mount (Angled) Participant Setup, Binocular

Before the subject is seated, make sure that the EyeLink 1000 Desktop Mount

is already set up for binocular tracking.

1) Make sure version 3.0 or above of the EyeLink 1000 host software is

running on the Host PC. Tracker version information is displayed on the

“Off-line” screen of the host software.

2) For a binocular Desktop Mount, check whether the 25 mm lens (with a

long focusing arm) has been installed. The 35 mm lens (without a

focusing arm) may also be used at a further distance.

3) Check whether the camera is set to the oblique position – the elongation

of the camera should form a 45-degree angle relative to the table (see the

figure below). If not, please loosen the Camera Screw at the front and

move it to the bottom end of the slot. Rotate the camera until its

elongation forms a 45-degree angle relative to the table, and then tighten

the screw.

4) The Desktop Mount should be placed at a distance of 40 to 70 cm from

the observer (measured from the front end of the Camera Screw to the

rear/distal end of the chinrest pad). The recommended tracking distance

is generally from 50 to 55 cm.

5) Place the Desktop Mount so that it is aligned to the center of the

monitor. You may also need to raise the Desktop Mount so that the top of