Original Research ARTICLE

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A recurrent network in the lateral amygdala: a mechanism for coincidence detection

1
W. M. Keck Foundation Laboratory of Neurobiology, Center for Neural Science, New York, USA
2
CSTS, Department of Psychiatry, USU, Bethesda, USA
3
CNRS-UMR8620, NAMC, Universitè Paris-Sud, Orsay, France
4
Queens College and the Graduate Center, CUNY, NY, USA
Synaptic changes at sensory inputs to the dorsal nucleus of the lateral amygdala (LAd) play a key role in the acquisition and storage of associative fear memory. However, neither the temporal nor spatial architecture of the LAd network response to sensory signals is understood. We developed a method for the elucidation of network behavior. Using this approach, temporally patterned polysynaptic recurrent network responses were found in LAd (intra-LA), both in vitro and in vivo, in response to activation of thalamic sensory afferents. Potentiation of thalamic afferents resulted in a depression of intra-LA synaptic activity, indicating a homeostatic response to changes in synaptic strength within the LAd network. Additionally, the latencies of thalamic afferent triggered recurrent network activity within the LAd overlap with known later occurring cortical afferent latencies. Thus, this recurrent network may facilitate temporal coincidence of sensory afferents within LAd during associative learning.
Keywords:
reverberation, autoassociative, Hopfield, LTD, feedback, polysynaptic
Citation:
Johnson LR, Hou M, Ponce-Alvarez A, Gribelyuk LM, Alphs HH, Albert Jr L, Brown BL, LeDoux JE and Doyére V (2008). A recurrent network in the lateral amygdala: a mechanism for coincidence detection. Front. Neural Circuits 2:3. doi: 10.3389/neuro.04.003.2008
Received:
21 February 2008;
 Paper pending published:
15 April 2008;
Accepted:
17 September 2008;
 Published online:
24 November 2008.

Edited by:

Gilles Laurent, California Institute of Technology, USA

Reviewed by:

Shreesh P. Mysore, Stanford University, USA
Rafael Yuste, Columbia University, USA
Copyright:
© 2008 Johnson, Hou, Ponce-Alvarez, Gribelyuk, Alphs, Albert, Brown, LeDoux and Doyère. This is an open-access article subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.
*Correspondence:
Luke R. Johnson, Department of Psychiatry and Program in Neuroscience, Uniformed Services University, Bethesda, MD 20814, USA. e-mail: Luke.Johnson@usuhs.mil; Valérie Doyère, CNRS-UMR8620, NAMC, Université Paris-Sud, 91405 Orsay, France. e-mail: valerie.doyere@u-psud.fr.
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