Researchers from Radboud University and ZAS Berlin have developed a new perspective on why humans often move their hands rhythmically during speaking. The perspective published in Neuroscience and Biobehavioral Reviews, suggests that there are striking connections between animal and human behavior when it comes to moving with sounds. For example, flying bats synchronize their echo-locating vocalization and their wingbeats which can be directly related to how humans synchronize acoustic features of their voice and move their upper limbs.