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History
- Received June 22, 2010
- Revision received December 23, 2010
- Accepted January 21, 2011
- First published March 23, 2011.
- Version of record published March 23, 2011.
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Copyright © 2011 the authors 0270-6474/11/314466-09$15.00/0
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Disclosures
- Received June 22, 2010.
- Revision received December 23, 2010.
- Accepted January 21, 2011.
This work was supported in part by grants from the National Institutes of Health [National Institute on Aging Grant AG31164 (M.P.W.)] and the University of California, Berkeley (M.P.W.). We thank Edwin Robertson and Jonathan Wallis for their thoughtful insights and comments on this work.
- Correspondence should be addressed to Matthew P. Walker, Department of Psychology, Tolman Hall 3331, University of California, Berkeley, Berkeley, CA 94720-1650. mpwalker{at}berkeley.edu