Knowledge Base

General notes 12 General notes

The Observer Xt

Independent Variables

If the Independent Variables list appears when you press the Start

Observation button, the actual observation (and therefore eye tracking

by Tobii Pro Studio) starts when you click OK in the Enter Independent

Variables window. You can choose when the Enter Independent Variables window

appears. For details, see Set up your Project > Project Settings in The

Observer XT Help.

For more information on recording data in The Observer XT, see Carry

out an Observation in The Observer XT Help.

N-linx Agent

On the Tobii Pro Studio computer, you can check the status of N-Linx

Agent. Click the arrow icon on the system tray, then double-click the N-

Linx Agent icon.

The N-Linx Agent window shows the status of Tobii Pro and The

Observer XT. General notes The Observer XT is visible and Online when the program is open.

Tobii Pro is Offline when it is installed, but not active. This is the

case immediately after installation of N-Linx Agent and after the computer is restarted.

After creating an observation in The Observer XT, the status of Tobii

Pro becomes Online.

Online means that the Tobii Pro plugin is started and therefore

available for communication. Once the Tobii Pro plugin is started, it remains running until the PC is shut down.

Eye Tracking

To carry out a new recording with the same participant

Tobii Pro Studio: Start a new recording on the Tobii Pro Studio

computer. Open the tab Use Existing Participant. Select the participant

and click Continue. Then repeat the procedure from step 13 on page 24.

Tobii Pro Lab: Open the Record tab and select the participant in the

Participant pane at the bottom. Then repeat the procedure from step 9

on page 21.

To repeat calibration

Select the points to recalibrate and click Recalibrate (n. points). General notes If the calibration continues to be unsatisfactory, Tobii Pro Studio has the option to look into the calibration in more detail. To do so, click

Check Calibration. Nine points appear on the screen of the test

participant, with the gaze represented as a circle. Move the chair up and down or backwards and forwards until the circle is around the dot the participant looks at. Make sure the gaze is detected in the correct position for each calibration point. When done, let the participant press the Esc key. Tobii Pro Lab does not have this functionality.

To view the fixations live

Do one of the following: Connect the Tobii Pro system to two monitors. Place one of the two monitors in the observation room. In Tobii Pro Studio, click the Setup icon and choose Show Live Viewer, and select that monitor. If you have the Enterprise version of Tobii Pro Studio, this version includes a remote viewer application. Install this on the Observer computer to view the fixations live. You can also use this program to control Tobii Pro Studio, for example start a new recording, and do the calibration.

Test Leader Display

Windows font size

To make sure that the gaze points are correctly positioned when reviewing the test, set the Windows font size on the stimulus

monitor to 100%. In the Search field of the start screen, type

"display" and click Change display settings. Under Scale and layout,

choose 100% from the list Make text and other items larger or

smaller. General notes

Multiple monitors

When using a dual screen setup, set the same resolution on both screens.

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Source: The Observer XT 17 - Technical Note - Tobii Pro Eye trackers