About the Authors

Piers D.L. Howe

To whom correspondence should be addressed. E-mail: phowe@hms.harvard.edu

Affiliation Department of Neurobiology, Harvard Medical School, Boston, Massachusetts, United States of America

Margaret S. Livingstone

Affiliation Department of Neurobiology, Harvard Medical School, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ML PH. Performed the experiments: PH. Analyzed the data: PH. Wrote the paper: ML PH.