The amygdala-insula-medial prefrontal cortex-lateral prefrontal cortex pathway and its disorders

Area of Science:

• Neuroscience
• Cognitive Psychology
• Affective Science

Background:

• Existing models identify three stations for emotion processing: amygdala (discrete features), anterior insula (whole-body patterns), and medial prefrontal cortex (emotion concepts).
• A separate model highlights medial BA 9 for emotional state integration and lateral BA 9 for selection/inhibition.
• These models provide a foundation for understanding the neural basis of emotion processing.

Purpose of the Study:

• To propose an integrated four-station pathway for emotion processing.
• To link specific brain regions within this pathway to distinct emotional functions and clinical conditions.

Main Methods:

• Synthesizing existing models of emotion processing and prefrontal cortex function.
• Reviewing literature associating specific brain areas with psychological conditions.

Main Results:

• A proposed four-station pathway: amygdala (discrete body features), anterior insula (whole-body patterns), medial BA 9 (emotion concepts integration), and lateral BA 9 (concept selection/inhibition).
• Association of amygdala with psychopathy, anterior insula with alexithymia, medial BA 9 with somatosensory discrimination deficits, and lateral BA 9 with emotional impulsivity.

Conclusions:

• The integrated model offers a more comprehensive framework for understanding emotion processing.
• Specific brain regions within this pathway are implicated in various emotional and cognitive disorders.