Multimodal and Site-Specific Plasticity of Amygdala Parvalbumin Interneurons after Fear Learning

Academic Article


  • Stimulus processing in fear conditioning is constrained by parvalbumin interneurons (PV-INs) through inhibition of principal excitatory neurons. However, the contributions of PV-IN microcircuits to input gating and long-term plasticity in the fear system remain unknown. Here we interrogate synaptic connections between afferent pathways, PV-INs, and principal excitatory neurons in the basolateral amygdala. We find that subnuclei of this region are populated two functionally distinct PV-IN networks. PV-INs in the lateral (LA), but not the basal (BA), amygdala possess complex dendritic arborizations, receive potent excitatory drive, and mediate feedforward inhibition onto principal neurons. After fear conditioning, PV-INs exhibit nucleus- and target-selective plasticity, resulting in persistent reduction of their excitatory input and inhibitory output in LA but not BA. These data reveal previously overlooked specializations of amygdala PV-INs and indicate specific circuit mechanisms for inhibitory plasticity during the encoding of associative fear memories.
  • Authors

    Published In

  • Neuron  Journal
  • Digital Object Identifier (doi)

    Author List

  • Lucas EK; Jegarl AM; Morishita H; Clem RL
  • Start Page

  • 629
  • End Page

  • 643
  • Volume

  • 91
  • Issue

  • 3