Functional Connectivity of the Human Amygdala

The amygdala is a pivotal limbic structure comprising multiple nuclei that integrate sensory, autonomic and cognitive inputs to orchestrate emotional and social behaviours. Functional connectivity analyses have revealed that its subdivisions—basolateral, centromedial and cortical groups—engage distinct networks spanning prefrontal, temporal, insular and subcortical regions. At rest and during task performance, coherent activity patterns between the amygdala and regions such as the medial prefrontal cortex, anterior cingulate and sensory cortices underpin processes including threat evaluation, decision making and interoception. Structural and functional parcellation approaches have delineated mediolateral topographies that correspond with emotional valuation, learning and physiological regulation. Dynamic investigations have further characterised the directionality and temporal hierarchy of information flow, demonstrating rapid bidirectional interactions with orbitofrontal, sensory–motor and salience networks. Together, these findings underscore the amygdala’s role as a network hub whose connectivity profiles are central to understanding affective regulation, individual variation in emotional traits and the pathophysiology of psychiatric disorders.

Research from Nature Portfolio

Recent longitudinal population analyses have mapped microanatomical changes across eighteen amygdala nuclei over several years. These studies reveal that distinct nuclei undergo parallel plasticity with prefrontal and salience circuitry and exhibit structural coupling patterns that align with behavioural and phenomic profiles, including decision-making and risk-taking traits. Connectivity-based parcellation using high-resolution diffusion imaging has identified three principal amygdala clusters arranged mediolaterally, each defined by unique white matter pathways to limbic and cognitive systems. This in vivo framework provides a basis for personalised circuit mapping in clinical populations. In addition, work combining intracranial electrical stimulation with electrophysiology and functional imaging has characterised the temporal order and directional influence of connections between medial and lateral subdivisions and their downstream cortical and subcortical targets, refining models of human amygdala network dynamics.

Functional Connectivity of the Human Amygdala publication trend

The graph below shows the total number of articles in functional connectivity of the human amygdala across all publications each year (not limited to Nature Index journals).

Technical terms

Functional connectivity: Statistical dependence between neural signals in distinct brain regions, reflecting coordinated activity.

Effective connectivity: Directed influence one neural element exerts over another, often inferred from stimulation or causal modelling.

Parcellation: Division of a brain structure into subregions based on anatomical or connectivity profiles.

Resting-state fMRI: Functional magnetic resonance imaging acquired in the absence of overt tasks, used to assess intrinsic connectivity networks.

Diffusion tractography: Imaging technique that reconstructs white matter pathways by modelling water diffusion in brain tissue.

Salience network: A set of brain regions, including the anterior cingulate and insula, involved in detecting and filtering salient stimuli.

References

1. Brainwide mesoscale functional networks revealed by focal infrared neural stimulation of the amygdala. National Science Review (2024).
2. Longitudinal microstructural changes in 18 amygdala nuclei resonate with cortical circuits and phenomics. Communications Biology (2024).
3. Connectivity-based parcellation of the amygdala and identification of its main white matter connections. Scientific Reports (2023).
4. Altered hippocampus and amygdala subregion connectome hierarchy in major depressive disorder. Translational Psychiatry (2022).
5. Mapping effective connectivity of human amygdala subdivisions with intracranial stimulation. Nature Communications (2022).