Summary: A new Northwestern Medicine study reveals continuous communication between the human brain’s social cognitive network — the regions responsible for understanding others’ thoughts and intentions — and the amygdala, the evolutionarily older structure that evaluates emotional significance and threat. High-resolution functional MRI (fMRI) scans show that this link allows social reasoning networks to access the amygdala’s emotional processing, offering insight into how emotion and social cognition are integrated in the human brain.
Researchers say this discovery could guide less-invasive interventions, such as transcranial magnetic stimulation (TMS), to influence circuits involved in anxiety and depression by targeting cortical regions connected to the amygdala. The findings also illuminate how recent expansions in human association cortex cooperate with ancient emotional centers to support complex social behavior.
Key Facts:
- The social cognitive network maintains ongoing communication with the amygdala, shaping social perception and emotion-driven behaviors.
- Ultra high-resolution fMRI allowed identification of previously undetected network regions and their specific connections to the amygdala’s medial subregions.
- These connectivity maps suggest new, potentially noninvasive treatment targets for conditions tied to amygdala overactivity, including anxiety and depression.
Source: Northwestern University
We’ve all experienced it: moments after leaving a social event you find your mind replaying interactions — wondering what others thought, whether a joke landed, or whether you said something awkward. Those everyday mental checks rely on the brain’s ability to model other people’s thoughts and intentions, a capacity often called “theory of mind.”
A team at Northwestern Medicine set out to understand how the human brain developed such refined social reasoning. Their study focused on how recently evolved association areas that support social cognition connect with older limbic structures that process emotional significance.
“We spend a lot of time wondering what another person feels or thinks — whether we’ve offended them or whether our behavior was appropriate,” said senior author Rodrigo Braga. He noted that the brain areas supporting that kind of social inference are part of association cortex that expanded during recent human evolution, suggesting that sophisticated social thinking is a relatively new development in our lineage.
The new research shows that these expanded social-cognitive regions are not isolated. Instead, they are in continuous communication with the amygdala, an evolutionarily older structure implicated in fear, threat detection, and a variety of social behaviors such as parenting, mating, aggression, and navigating dominance hierarchies.
Previous studies reported co-activation of the amygdala and social-cognitive regions during tasks. What distinguishes this work is evidence that the communication between these systems is ongoing even at rest, implying intrinsic circuit associations rather than transient task-driven links.
High-resolution imaging revealed new details
Key to the discovery were exceptionally high-resolution fMRI scans from the Natural Scenes Dataset. Those data permitted the team to visualize fine-grained functional anatomy inside the medial temporal lobe and to detect specific amygdala subregions — including the medial nucleus and areas near the basolateral complex — that show selective connections to social cognitive association zones.
Co-corresponding author Donnisa Edmonds emphasized that these scans allowed identification and replication of network regions previously unseen on lower-resolution imaging. “We were able to identify network regions we weren’t able to see before,” she said, noting that the clarity of the data made it possible to observe consistent patterns within individuals.
Implications for anxiety and depression treatment
Both anxiety and depression have been linked to amygdala hyperactivity, which can intensify emotional responses and impair regulation. Traditional approaches to directly modulate deep structures like the amygdala can require invasive surgery, such as deep brain stimulation. The study’s connectivity findings suggest a different strategy: because the amygdala communicates with cortical regions that lie closer to the skull, noninvasive methods like TMS could be used to influence amygdala-driven circuits indirectly by stimulating these accessible cortical nodes.
Edmonds explained that this circuit-based perspective opens opportunities to refine therapeutic targeting for affective disorders by leveraging functional connections, potentially improving outcomes while avoiding invasive procedures.
About this neuroscience, emotion, and social skills research news
Author: Kristin Samuelson
Source: Northwestern University
Contact: Kristin Samuelson – Northwestern University
Image: The image is credited to Neuroscience News
Original Research: Open access. “The human social cognitive network contains multiple regions within the amygdala” by Rodrigo Braga et al., published in Science Advances (DOI: 10.1126/sciadv.adp0453)
Abstract
The human social cognitive network contains multiple regions within the amygdala
Reasoning about other people’s thoughts and intentions — commonly described as “theory of mind” — is central to social cognition. This capacity depends on association areas of the cortex that expanded markedly in the human lineage. Prior work has shown that these association zones form parallel, distributed networks that occupy adjacent, interdigitated cortical territory yet support distinct functions. One such network is preferentially engaged by social-cognitive processing. What circuit-level features distinguish these parallel networks?
In this study, we demonstrate that social-cognitive association regions are intrinsically and selectively connected to anterior medial temporal lobe structures involved in emotional learning and social behavior. Specifically, the social-cognitive network shows selective connectivity with amygdala regions near the basolateral complex and the medial nucleus. These results indicate that social cognition arises through coordinated interactions between amygdala microcircuits and a broader distributed association network, and they suggest the medial nucleus of the amygdala may play a meaningful role in human social cognition.