SennsLab: Guide to Areas of Interest (AOI)

How to create Areas of Interest in SennsLab

An AOI is a specific region of the image that is defined to allow for statistical comparison in the analysis.  With AOI, emotional and attention data can be compared for different areas of the image (i.e. between the logo and the product image), or between similar areas in multiple images (i.e. the product logo in two different versions of an advertisement).  Using AOI allows you to segment the data into finer detail than just the image itself.   

To Setup AOI:

  1. To enable AOI, click on the "Use Area of Interest" selection.  The location depends on the template used:
    1. For the Passive Image Template this is found under the stimuli class list in the "Methodology" tab.
    2. For the Active Image Template, this is under the task description on the right side of the screen in the "Tasks" tab.
  2. Add images to the experiment
  3. For each stimulus image on the right, click on the Aoi icon in the upper right corner.  This will open the AOI definition window.
  4. Next to Areas of Interest, click on "new" and designate a name for your AOI.
  5. Draw the AOI directly on your image by clicking to define the first "corner" of each straight line in the object.  Click to complete the line and create the next, outlining your area of interest until you've come back to where you've started.  AOI can be any shape or size, but the lines you draw can not cross.  Click "done" to complete the AOI, then "new" to define the next.

Tip: AOI can be created and modified in the analysis phase as well.

Notes for using AOI: 

  • AOI analysis is available for the following templates only:  Passive Image Test, Active Image Test
  • AOI can only be defined for Target Stimuli
  • You can define a maximum of 40 AOI per image
  • AOI can overlap but this will alter how some of the data is analyzed. 
  • AOI size is limited by the precision and accuracy of your eye tracking system, visual acuity of your participant, and the fovea size of the human eye.  AOI that are smaller than 2 degrees of visual angle are likely not useful in most experiments. 
  • To use AOI fully, you need a fixed eye tracking system.