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Related Experiment Video

Updated: May 10, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Published on: April 5, 2016

The prelimbic cortex is critical for context-dependent fear expression.

Eun Joo Kim¹, Namsoo Kim, Hyun Taek Kim

¹Department of Psychology, Korea University Seoul, Republic of Korea.

Frontiers in Behavioral Neuroscience

|June 27, 2013

Summary

This summary is machine-generated.

The prelimbic cortex (PL) is crucial for regulating fear responses based on context. Lesioning the PL disrupts context-dependent fear discrimination, showing its role in linking environmental cues to learned fear.

Keywords:

amygdala context fear discrimination hippocampus prelimbic cortex

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Area of Science:

Neuroscience
Behavioral Neuroscience
Cognitive Neuroscience

Background:

Emotional regulation is vital for survival and adaptive behavior.
Context-dependent fear discrimination (CDFD) involves learning to fear a cue in one environment but not another.

Purpose of the Study:

To investigate the role of the prelimbic cortex (PL) in contextual modulation of conditioned fear.
To determine if the PL is necessary for discriminating fear based on environmental context.

Main Methods:

Utilized a context-dependent fear discrimination (CDFD) task in rats.
Administered bilateral lesions to the prelimbic cortex (PL) and assessed freezing behavior.
Performed single-unit recordings in the PL during the CDFD task.
Conducted a separate context discrimination task to rule out general deficits.

Main Results:

Rats with PL lesions exhibited similar freezing responses to a conditioned stimulus (CS) in both fearful and safe contexts, unlike controls.
Lesioned rats could still discriminate between contexts in a simple discrimination task, indicating intact contextual processing.
PL neurons showed differential firing rates correlating with the context-dependent fear response.

Conclusions:

The prelimbic cortex (PL) plays a critical role in the selective expression of conditioned fear.
The PL integrates contextual information to modulate fear responses to explicit cues.
These findings highlight the PL's importance in context-dependent emotional regulation.