How distinct functional insular subdivisions mediate interacting neurocognitive systems.

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• The insula is theorized as a central hub for interoceptive awareness.
• It modulates two key neurocognitive systems: self-control and reward-seeking.
• Specific roles of the posterior insula (PI), dorsal anterior insula (dAI), and ventral anterior insula (vAI) are proposed.

Purpose of the Study:

• To test the proposed neurocognitive model of insular function.
• To investigate the relationship between insular connectivity and cognitive performance.
• To validate findings using multimodal neuroimaging data.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) on 120 undergraduate students.
• fMRI during an Iowa Gambling Task to assess neuro-cognitive associations.
• Validation using an independent multimodal imaging dataset.

Main Results:

• The dAI showed strong connectivity with prefrontal regions involved in self-control.
• The vAI was primarily connected to the amygdala-striatal reward circuit.
• The PI connected mainly to visceral-sensorimotor systems.
• Connectivity between dAI and ventrolateral prefrontal cortex correlated positively with self-control performance.
• Connectivity between vAI and orbitofrontal cortex/subgenual anterior cingulate cortex correlated negatively with reward-seeking behavior.

Conclusions:

• The findings support distinct functional roles for sub-regions of the insula.
• Insular connectivity patterns are linked to self-control and reward-seeking processes.
• This study elucidates the insula's critical role in integrating interoception with higher-order cognition.