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Anatomical and functional overlap within the insula and anterior cingulate cortex during interoception and phobic
Xavier Caseras1, Kevin Murphy, David Mataix-Cols
1MRC Centre for Neuropsychiatric Genetics and Genomics, Department of Psychological Medicine and Neurology, Cardiff University, Wales, United Kingdom. CaserasX@cardiff.ac.uk
Human Brain Mapping
|December 14, 2011
Summary
Brain regions anterior insula and dorsal anterior cingulate cortex (ACC) show overlapping activity during phobic reactions and interoception. This integration is linked to fear, but not consistently in blood-injection-injury (BII) phobias.
Area of Science:
- Neuroscience
- Psychology
- Medical Imaging
Background:
- The anterior insula and dorsal anterior cingulate cortex (ACC) are crucial for integrating external stimuli with internal bodily responses, forming emotional feelings.
- Understanding the overlap in brain activity during phobic reactions and interoception is key to understanding fear.
- Previous research suggests these areas are involved in emotional processing and self-awareness.
Purpose of the Study:
- To investigate the anatomical and functional overlap of brain activity in the anterior insula and dorsal ACC during phobic reactions and interoception.
- To compare these overlaps between spider phobics, blood-injection-injury (BII) phobics, and healthy controls.
- To explore the role of these brain regions in the subjective experience of fear.
Main Methods:
- Functional magnetic resonance imaging (fMRI) using Blood Oxygen Level-Dependent (BOLD) responses.
- Two experimental paradigms: phobic symptom provocation and interoceptive awareness tasks.
- Participants included 29 individuals with phobias (spider or BII) and 17 healthy controls.
Main Results:
- A significant anatomical overlap in BOLD responses was observed in the anterior insula and ACC during both phobic reactions and interoceptive awareness.
- Activity in these brain regions was correlated in spider phobia participants.
- No significant correlation was found in blood-injection-injury (BII) phobic participants, suggesting potential differences in fear processing.
Conclusions:
- The findings support the role of the anterior insula and ACC in integrating perceived stimuli and bodily responses, contributing to the experience of fear.
- The lack of correlation in BII phobics may indicate unique physiological responses (e.g., vasovagal responses) influencing fear processing in this group.
- Further research is needed to elucidate the specific mechanisms underlying BII phobia and its distinct neural correlates.
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