Workflow diagrams and pupil dilatation in eye-tracking testing

Eye-tracking devices produce a huge amount of data. One of them is the diameter of pupils. The presented test explore the change of diameter pupils while reading the workflow diagrams from QGIS Processing Modeler. The evaluation describes the change of diameter as a consequence of increasing mental labour while fulfilling the task on workflow diagram. The presented measuring compares the same workflow diagram without task (free-viewing mode) and the same diagram with the task. The result of comparison verifies the hypothesis that diagram with task bring some mental effort and this phase is distinguishable in the graph of pupil diameter from the eye-tracking measurement.