@InProceedings{vasalya:ro-man:2018, author = {Vasalya, Ashesh and Ganesh, Gowrishankar and Kheddar, Abderrahmane}, title = {Distinct motor contagions during and after observation of actions by a humanoid co-worker}, booktitle = {International Symposium on Robot and Human Interactive Communication}, year = {2018}, pages = {51--57}, address = {Nanjing, China}, month = {August 27-August 31}, url = {https://hal.archives-ouvertes.fr/hal-01819774/file/Distinct\%20motor\%20contagions\%20during\%20and\%20after\%20observation\%20of\%20actions\%20by\%20a\%20humanoid\%20co-worker.pdf}, keywords = {Motor Contagions; Humanoid Robot Coworker; Human-Robot Interaction}, doi = {10.1109/ROMAN.2018.8525641}, abstract = {Multiple studies have shown that the mere observation of movements by a robot can affect an observing human\textquotesingle s movement; effects referred to as motor contagions. However, previous studies have either analyzed motor contagions induced during (which we call on-line contagions), or induced after (off-line contagions) observation of the robot, but never both together. It thus remains unclear whether and how these two contagions differ from each other. Here, in an empirical industrial co-worker setting, we examine the differences in the off-line and on-line contagions induced in participants by the observation of the same movements performed by a human, or a humanoid robot co-worker. We observed that while the off-line contagions predominantly affect the participant\textquotesingle s movement velocity, the on-line contagions affect their movement frequency. Furthermore, the off-line contagions were prominent after observing another human, while the on-line contagions were equally strong with either a human or a humanoid coworker. These results suggest that actions by a humanoid robot can induce distinct effects on human behaviors, during and after observation.} }