Next, using ultra-high-field fMRI, we found that both environmental features affected neural activity in regions linked to foraging—including dorsal raphe nucleus, and substantia nigra

That analogous circuits track food and friendship might speak to social connection as a fundamental human need.

We also found individual differences: General social behaviour and sensitivity to these environmental features correlated with mental health dimensions like social thriving and anhedonia.

These patterns could help us identify who might benefit from interventions, opening paths to targeted support

In a pre-registered study with 700+ participants, we found that both friendliness and density had a significant influence on choices.

In other words, social environments might shape our tendency to initiate connection.

We developed a novel paradigm where participants sent friend requests in different social environments.

These environments varied in two features:

Friendliness: How likely is my request accepted?
Density: How many people are around?

How do we decide to reach out and make friends?

My PhD work on this question is out today in @pnas.org 🎉

Study done in collaboration with the incredible
@mirunarascu.bsky.social, @sorcha-hamilton.bsky.social, Ingrid Yu, and my two amazing supervisors, Matthew Rushworth and @mkflugge.bsky.social👇