Neuronal Competition and Selection During Memory Formation

doi:10.1126/science.1139438

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Neuroscience

Science 20 April 2007:
Vol. 316. no. 5823, pp. 457 - 460
DOI: 10.1126/science.1139438

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Neuronal Competition and Selection During Memory Formation

Jin-Hee Han,¹^,2^,3^* Steven A. Kushner,⁴^,5^,6^* Adelaide P. Yiu,¹^,3 Christy J. Cole,¹^,2 Anna Matynia,⁴ Robert A. Brown,⁴ Rachael L. Neve,⁷ John F. Guzowski,⁸ Alcino J. Silva,⁴ Sheena A. Josselyn¹^,2^,3

Competition between neurons is necessary for refining neuralcircuits during development and may be important for selectingthe neurons that participate in encoding memories in the adultbrain. To examine neuronal competition during memory formation,we conducted experiments with mice in which we manipulated thefunction of CREB (adenosine 3',5'-monophosphate response element–bindingprotein) in subsets of neurons. Changes in CREB function influencedthe probability that individual lateral amygdala neurons wererecruited into a fear memory trace. Our results suggest a competitivemodel underlying memory formation, in which eligible neuronsare selected to participate in a memory trace as a functionof their relative CREB activity at the time of learning.

¹ Program in Neurosciences and Mental Health, Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada.
² Department of Physiology, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
³ Institute of Medical Sciences, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
⁴ Departments of Neurobiology, Psychology, and Psychiatry, and Brain Research Institute, Gonda Building, 695 Young Drive South, University of California, Los Angeles, CA 90095, USA.
⁵ Department of Psychiatry, Columbia University, New York, NY 10032, USA.
⁶ New York State Psychiatric Institute, New York, NY 10032, USA.
⁷ Molecular Neurogenetics Laboratory, Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont, MA 02478, USA.
⁸ Neurobiology and Behavior, School of Biological Sciences, University of California, Irvine, CA 92697, USA.

^* These authors contributed equally to this work.

To whom correspondence should be addressed. E-mail: sheena.josselyn{at}sickkids.ca

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