-    the size of the nodes represents the number of times that this element has been studied
-    the width of the arrows correspond to the number of times that this relationship has been identified in the literature
-    the colors correspond to the six high level modalities (e.g., gaze, log data, body, head, vertbal and physiological data)
-    you can click on an actual measure of collaboration or multimodal feature, and it will provide a google scholar link to the actual paper