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The Basolateral Amygdalae and Frontotemporal Network Functions for Threat Perception
Ruud Hortensius1, David Terburg2, Barak Morgan3
1Brain and Emotion Laboratory, Department of Cognitive Neuroscience, Faculty of Psychology and Neuroscience, Maastricht University, Oxfordlaan 55, 6229 EV Maastricht, The Netherlands; Department of Psychiatry and Mental Health, University of Cape Town, J-Block, Groote Schuur Hospital, Observatory, Cape Town, South Africa.
Eneuro
|April 5, 2017
Summary
Damage to the basolateral amygdalae alters threat perception by reducing temporal lobe activity and increasing frontal lobe activity. This shift may cause hypersensitivity to threats.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Psychology
Background:
- The amygdalae are crucial for threat perception, but human research lacks detailed understanding of specific subnuclei roles.
- Animal studies highlight the need to examine amygdala subnuclei for a comprehensive view of threat processing.
- Human imaging limitations necessitate studies on individuals with selective amygdala lesions.
Purpose of the Study:
- To investigate the role of the basolateral amygdala (BLA) and its network connections in automatic threat perception.
- To understand how BLA damage affects neural activity and connectivity during threat processing.
Main Methods:
- Functional MRI (fMRI) was used to measure brain activation and connectivity.
- Study included five individuals with Urbach-Wiethe disease (focal BLA damage) and 12 matched controls.
- Participants viewed threatening face-body compound stimuli.
Main Results:
- BLA damage led to decreased activation in the temporal pole.
- Increased activity was observed in the ventral and dorsal medial prefrontal cortex and medial orbitofrontal cortex.
- Functional connectivity maps revealed a dissociation between frontal and temporal networks.
Conclusions:
- BLA damage shifts processing from temporal to frontal networks, impacting threat perception.
- This dissociation may impair ambiguity resolution and lead to dysfunctional threat signaling.
- Results support a dynamic, subnuclei-based model of amygdala involvement in fear perception and hypersensitivity to threat.