About the Authors

Timothy E Holy

To whom correspondence should be addressed. E-mail: holy@wustl.edu

Affiliation Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri, United States of America

Zhongsheng Guo

Affiliation Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

TEH conceived the experiments. TEH and ZG designed the experiments, built the custom hardware, and wrote the software. ZG collected the data. TEH analyzed the data and wrote the paper.