About the Authors

Jooeun Ahn

aje@mit.edu

Affiliation Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Neville Hogan

Affiliations Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Competing Interests

NH holds equity in Interactive Motion Technologies, Inc. that manufactures the robotic technology used in this study. The authors confirm that NH's affiliation to Interactive Motion Technologies, Inc. does not alter the authors' adherence to the PLoS ONE policies on sharing data and materials. As declared in Funding, this work was supported in part by Samsung Scholarship. Although it shares the same name as Samsung which is a commercial organization, Samsung Scholarship foundation is a nonprofit organization which supports young scholars without any obligation related with Samsung. (More information about Samsung Scholarship foundation is available from http://www.ssscholarship.com). Therefore, this does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: JA NH. Performed the experiments: JA. Analyzed the data: JA. Wrote the paper: JA NH.