You can draw AOIs at any time: prior to launching an experiment, while it is in fielding or when you receive your results.
On the left panel there are several tools:
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Zoom. You can zoom in and out on the media to focus on certain areas at a time.
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Draw. Switch between drawing a rectangular or polygonal AOI shape. If you select the rectangular tool simply click and drag the mouse to start to draw an AOI. Select the polygon tool to make an irregular form by clicking and adding points to the shape, just make sure to have the last point and the first point meet in the same location.
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Select. The multi-select tool will allow you to select the entire AOI and adjust it's placement or resize the area. The single select will allow you to choose a specific point in the area of interest and adjust it's placement.
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Import. If you created an experiment in the past, that has very similar AOIs to your new experiment, you can import the already drawn AOIs to save you time not having to redraw them. Importing a new representation is used on more advanced pieces of media where you need to change the representation of the entire media.
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Media. If you uploaded more than one media you can switch between them by clicking on the one you'd like to edit.
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Areas of Interest. As you add more areas you will see the list of your AOIs here. You can select the different areas from the list, open the properties, edit, copy or delete them.