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Updated: May 11, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
Published on: April 5, 2016
Amygdala inputs drive feedforward inhibition in the medial prefrontal cortex
Jonathan Dilgen1, Hugo A Tejeda, Patricio O'Donnell
1Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA.
Basolateral amygdala (BLA) stimulation inhibits prefrontal cortex (PFC) activity by activating local inhibitory interneurons. This research clarifies how the amygdala influences PFC function through inhibitory circuits.
Area of Science:
- Neuroscience
- Neurobiology
- Behavioral Neuroscience
Background:
- The amygdala and prefrontal cortex (PFC) are crucial for emotional regulation of behavior.
- The precise mechanism by which the amygdala influences PFC function remains unclear.
- Basolateral amygdala (BLA) output neurons are typically excitatory, yet BLA stimulation inhibits PFC neuronal firing.
Purpose of the Study:
- To investigate whether BLA inputs evoke feedforward inhibition in the PFC.
- To elucidate the role of local PFC interneurons in mediating BLA's effects on PFC activity.
Main Methods:
- In vivo juxtacellular and intracellular recordings in anesthetized rats.
- Stimulation of the basolateral amygdala (BLA).
- Administration of GABA-A antagonist picrotoxin.
Main Results:
- BLA stimulation activated PFC interneurons and inhibited pyramidal neurons.
- Pyramidal neurons exhibited depolarizing postsynaptic potentials with a negative reversal potential, indicating inhibitory input.
- Picrotoxin administration blocked inhibition, leading to action potential firing during BLA-evoked responses.
Conclusions:
- BLA stimulation activates local inhibitory interneurons within the PFC.
- This activation mediates a powerful feedforward inhibitory mechanism in the PFC.
- The findings clarify the circuit-level interactions between the amygdala and PFC in emotional processing.
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