Article Information
- Received December 13, 2011
- Revision received June 8, 2012
- Accepted July 5, 2012
- First published August 29, 2012.
- Version of record published August 29, 2012.
Author Information
Author contributions
Author contributions: R.R. designed research; V.N., R.L., and R.R. performed research; A.P.-A. and A.R. analyzed data; A.P.-A., A.R., and R.R. wrote the paper.
Disclosures
- Received December 13, 2011.
- Revision received June 8, 2012.
- Accepted July 5, 2012.
A.P.-A. was supported by a doctoral fellowship from the Consejo Nacional de Ciencia y Tecnología (CONACYT). A.R. was partially supported by French National Research Agency Grant ANR-05-NEUR045-01. The research of R.R. was partially supported by an International Research Scholars Award from the Howard Hughes Medical Institute, and grants from the Dirección del Personal Académico de la Universidad Nacional Autónoma de México and CONACYT. We thank Nicolas Brunel, Moshe Abeles, Bjørg Kilavik, and Joachim Confais for critical comments and ideas to earlier versions of this work, and Adrián Hernandez, Antonio Zainos, and Manuel Alvarez for technical assistance.
- Correspondence should be addressed to Ranulfo Romo at the above address. rromo{at}ifc.unam.mx
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