Focused Review ARTICLE
Front. Neurosci., 15 September 2009 | http://dx.doi.org/10.3389/neuro.01.027.2009
Department of Psychiatry and Program in Neuroscience, USU, Bethesda, MD, USA
Center for Neural Science, NYU, New York, NY, USA
NAMC, CNRS-UMR8620, Université Paris-Sud, Orsay, France
The study of memory in most behavioral paradigms, including emotional memory paradigms, has focused on the feed forward components that underlie Hebb's first postulate, associative synaptic plasticity. Hebb's second postulate argues that activated ensembles of neurons reverberate in order to provide temporal coordination of different neural signals, and thereby facilitate coincidence detection. Recent evidence from our groups has suggested that the lateral amygdala (LA) contains recurrent microcircuits and that these may reverberate. Additionally this reverberant activity is precisely timed with latencies that would facilitate coincidence detection between cortical and sub cortical afferents to the LA. Thus, recent data at the microcircuit level in the amygdala provide some physiological evidence in support of the second Hebbian postulate.