Knowledge Base

Record with Tobii Pro Lab 5 Record with Tobii Pro Lab

Aim

To design a test in Tobii Pro Lab and start and stop eye tracking acquisition with The Observer XT.

Prerequisite

You set up The Observer XT, following the procedure on page 17.

Procedure

In Tobii Pro Lab

1. Create a new Tobii Pro Lab project, or open an existing one. In case of a new project, choose Screen as Project type.
2. Open the Design tab.
3. Press the Add stimulus button on toolbar on the top and browse to the stimulus to display. Set its properties, for example the display

duration, in the Properties pane on the right. Add more stimuli, if

needed. 4. You are now ready to start your observation in The Observer XT.

In The Observer XT

5. Create a new observation. To do so, click Observations in the Project Explorer, then Create a new observation.
6. Name the observation, then click OK.

In Tobii Pro Lab

7. Let the participant take place behind the monitor with the eye tracker. Record with Tobii Pro Lab
8. Open the Record tab.

important Do not click the Start Recording button. Start the recording

by starting an observation in The Observer XT (see below).

In The Observer XT

9. To start the test, click the Start observation button.

If the Enter Independent Variable Values window opens on the

screen of The Observer XT, enter the independent variable values for that observation and click OK.

In Tobii Pro Lab

10.The calibration starts. Check that the test participant's eyes are

visible as two white circles in the center box of the drawing that appears on your screen. If not, change his/her position relative to the monitor (lower or raise the chair or let the test participant sit closer or further away from the monitor). 11. Click Start calibration to start the calibration and let the test participant follow the symbol moving on the screen. When the calibration is ready, a plot with the calibration results appears on the test leader monitor. 12. Check whether the calibration is good, that is, whether the distance between the gaze points and the positions of the calibration symbol is acceptable. If so, click Accept. 13. The stimuli are now presented. Let the participant carry out the tasks assigned.

In The Observer XT

14.Optionally, score the behaviors with keys on your keyboard. 15. To stop the test, click the Stop observation button in The Observer XT. Record with Tobii Pro Lab Eye tracking now stops automatically.

Notes

Eye tracking also stops when the test you designed in Tobii Pro

Studio ends before you pressed the Stop observation button in The

Observer XT. If the computer with the Tobii Pro software is restarted, you must restart The Observer XT as well. Otherwise starting acquisition with the Tobii Pro software will not work. If the computers with The Observer XT and the Tobii Pro software are restarted, it may take some time before the Tobii Pro plugin starts when you create the first observation. If you start an observation in The Observer XT before the plugin is fully running, acquisition with the Tobii Pro software does not start. If you notice this, create and start a second observation. Acquisition with the Tobii Pro software will now start.

More Information

For more information on how to design a test in Tobii Pro Lab, see the Tobii Pro Lab user manual.

---

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