How are the different Heat Map styles calculated?

There are three different types of heat maps in Tobii Studio: Count, Absolute Duration, Relative Duration.

  1. Count: The plot shows the accumulated number of fixations from all the selected test persons. This means that this plot only shows where people have looked and not for how long. That means that a 2000 ms fixation will look the same as a 100 ms fixation. It also means that a person that has spent a long time looking at a stimulus will have a greater impact on the heat map than someone who only glanced at it shortly.
  2. Absolute Duration: This plot shows how long the selected test persons have looked at the different areas in the image. This means a 2000 ms fixation will be 20 times higher (in color value) than a 100 ms fixation. It also means that a person that has spent a long time looking at a stimulus will have a greater impact on the heat map than someone who only glanced at it shortly.
  3. Relative Duration: The sum of the individual fixation lengths relative to the total fixation time on the image for each recording, if in recording A, the subject looked at the image for 10 seconds and at a specific object for 3 seconds and in recording B, the subject looked at the image for 10 minutes and at the specific object for 3 minutes. In this kind of Heat Map the data from recording A and recording B will have the same weight. Naturally, what is considered a fixation is dependent on the settings chosen in Fixation Filters.