Brain activity and functional connectivity patterns associated with loneliness: A resting-state fMRI study.

Area of Science:

• Neuroscience
• Psychology
• Public Health

Background:

• Loneliness is a growing public health concern linked to adverse psychological and physical health outcomes.
• Urbanization and aging populations exacerbate loneliness, necessitating research into its neural underpinnings.
• Understanding the brain mechanisms of loneliness is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate the neural correlates of loneliness in young adults.
• To identify specific brain regions and networks associated with subjective feelings of loneliness.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) data were collected from 238 young adults (ages 17-26).
• Fractional amplitude of low-frequency fluctuations (fALFF) and functional connectivity (FC) analyses were employed.
• Statistical correlations were performed to link loneliness scores with brain activity and connectivity.

Main Results:

• Loneliness negatively correlated with fALFF in the right posterior precuneus, indicating altered intrinsic brain activity.
• Positive FC was found between the right posterior precuneus and right superior frontal gyrus in relation to loneliness.
• Negative FC was observed between the right ventromedial prefrontal cortex and a network including the cerebellum, fusiform gyrus, and superior occipital gyrus.

Conclusions:

• Distinct patterns of intrinsic activity in the posterior precuneus are associated with loneliness.
• Specific functional connectivity alterations involving social cognition and emotional regulation networks are linked to loneliness.
• Findings provide neural evidence for individual differences in loneliness and inform potential neurostimulation and cognitive-behavioral interventions.