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Updated: May 1, 2026

Brain Imaging Investigation of the Neural Correlates of Emotional Autobiographical Recollection
Published on: August 26, 2011
Correlation Between Activation of the Prelimbic Cortex, Basolateral Amygdala, and Agranular Insular Cortex During
Akira Uematsu1, Akihiko Kitamura2, Ken Iwatsuki3
1Frontier Research Laboratories, Institute for Innovation, Ajinomoto Co., Inc., Kawasaki 210-8681, Japan Current address: Laboratory for Neural Circuitry of Memory, RIKEN Brain Science Institute, Saitama 351-0198, Japan.
This study reveals how the prelimbic cortex (PL) and connected brain regions, including the amygdala and insular cortex, work together during conditioned taste aversion learning in animals.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Learning and Memory
Background:
- Conditioned taste aversion (CTA) demonstrates taste-illness association.
- The prelimbic cortex (PL) is implicated in temporal event association.
- The whole-brain functional network of the PL during CTA is not well understood.
Purpose of the Study:
- To investigate the functional brain connectivity of the PL during CTA learning.
- To identify specific brain regions and neuronal pathways involved in CTA.
Main Methods:
- Awake functional magnetic resonance imaging (fMRI) and fiber tracking were employed.
- Blood oxygen-level-dependent (BOLD) signals were analyzed.
- Double immunofluorescence with neuronal activity and inhibitory markers, alongside retrograde tracers, was performed.
Main Results:
- Increased BOLD signal in the PL post-infusion.
- PL activity correlated with the amygdala and agranular insular cortex (IC).
- Structural connections between PL, amygdala, and IC were confirmed.
- Increased activity in excitatory neurons projecting to the PL from the basolateral amygdala (BLA) and agranular IC was observed.
Conclusions:
- Synchronized activity of the PL, agranular IC, and BLA is crucial for CTA learning.
- Identifies a specific neural circuit underlying taste aversion learning.
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