Fear conditioning occludes LTP-induced presynaptic enhancement of synaptic transmission in the cortical pathway to the lateral amygdala.

Abstract:

:Auditory information critical for fear conditioning, a model of emotional learning, is conveyed to the lateral nucleus of the amygdala via two routes: directly from the medial geniculate nucleus and indirectly from the auditory cortex. Here we show in the cortico-amygdala pathway that learned fear occludes electrically induced long-term potentiation (LTP). Quantal analysis of the expression of LTP in this pathway reveals a significant presynaptic component reflected in an increase in probability of transmitter release. Conditioned fear also is accompanied by the enhancement in transmitter release at this cortico-amygdala synapse. These results indicate that the synaptic projections from the auditory cortex to the lateral amygdala are modified during the acquisition and expression of fear to auditory stimulation, thus further strengthening the proposed link between LTP in the auditory pathways to the amygdala and learned fear.

journal_name

Neuron

journal_title

Neuron

authors

Tsvetkov E,Carlezon WA,Benes FM,Kandel ER,Bolshakov VY

doi

10.1016/s0896-6273(02)00645-1

subject

Has Abstract

pub_date

2002-04-11 00:00:00

pages

289-300

issue

2

eissn

0896-6273

issn

1097-4199

pii

S0896627302006451

journal_volume

34

pub_type

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