About the Authors

Maurice A Smith

To whom correspondence should be addressed. E-mail: mas@deas.harvard.edu

Affiliation Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, United States of America

Ali Ghazizadeh

Affiliation Department of Bioengineering, University of California Berkeley, Berkeley, California, United States of America

Reza Shadmehr

Affiliation Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

MAS conceived and designed the experiments. MAS and AG performed the experiments and analyzed the data. MAS and RS contributed reagents/materials/analysis tools. MAS and RS wrote the paper.