Areas Of Interest

jgideon

Hello,

I'm planning an experiment where participants will watch a video while their gaze behavior is recorded with an Eyelink eye tracker.

For this, I would like to define several areas of interest (AOI) - e.g. a face - that move in the video, to later see and analyze if, how many and how long fixations have fallen into these AOIs. Is there a way to define AOIs efficiently?

Unfortunately, I'm completely new to OpenSesame and don't know much about it yet. I've tried a couple of things but haven't really found anything satisfactory yet.

Thanks in advance :)

Joel

sebastiaan

Hi @jgideon ,

OpenSesame knows the locations of all elements on a Canvas . You can get this information by simply iterating over a Canvas object. Let's say that you have a sketchpad called my_sketchpad, then you can get the names and coordinates of all elements like so:

for name, element in items['my_sketchpad'].canvas:
    x, y, w, h = element.rect
    print(f'element {name}: top-left = {x}, {y}, size = {w}, {h}')

So the information is there. The next step will be to figure out how to actually use this information for an AOI analysis. This part is non-standard and depends entirely on how (and with which software) you intend to conduct the analysis, so I can't say much more about it!

Hope this helps!

— Sebastiaan