Typically, the actions of agents in classical animacy displays are synthetically created, thus forming artificial displays of biological movement. Therefore, the link between the motion in animacy displays and that of actual biological motion is unclear. In this chapter we will look at work being done to clarify this relationship. We will first discuss a modern approach to the creation of animacy displays whereby fullvideo displays of human interactions are reduced into simple animacy displays; this results in animate shapes whose motions are directly derived from human actions. Second, we will review what is known about the ability of typically developed adults and people with autism spectrum disorders to perceive the intentionality within these displays. Finally, we will explore the effects that motion parameters such as speed and acceleration, measured directly from original human actions, have on the perception of intent; fMRI studies that connect neural networks to motion parameters, and the resultant perception of animacy and intention, will also be examined.