Vempathy measures the test participants expressiveness, attention, and valence on a rolling basis throughout their recording. Just beneath the video player scrub bar at the bottom is a graph that represents the test participants emotional readings. This is helpful if you want to quickly visualize where the participant lost interest or had a negative experience. To switch between the expressiveness, attention, and valence graphs simply choose the reading that you would like to see in the filter toggle.
For your reference, please see our definitions of expressiveness, attention, and valence to ensure that you are correctly interpreting each. [LINK]