Posterior medial frontal cortex regulates sympathy: A TMS study

Area of Science:

• Neuroscience
• Social Psychology
• Cognitive Neuroscience

Background:

• Differential sympathy responses to harm suggest complex regulatory mechanisms.
• The posterior medial frontal cortex (PMFC) is implicated in social cognition, including empathy and self-representation.

Purpose of the Study:

• To investigate the role of the PMFC in regulating sympathy.
• To explore the PMFC's involvement in mentalizing and self-other overlap.
• To examine how disrupting PMFC function affects sympathy and related social-cognitive processes.

Main Methods:

• Transcranial magnetic stimulation (TMS) was used to temporarily down-regulate activity in the PMFC or a control region.
• Participants rated their sympathy and self-other overlap towards characters experiencing harm.
• Mentalizing abilities, specifically inferring cognitive and affective states, were assessed.

Main Results:

• Down-regulating the PMFC significantly increased participants' sympathy for both adversarial and affiliative characters.
• Contrary to predictions, PMFC down-regulation enhanced, rather than impaired, second-order cognitive inference abilities.
• No significant effect of PMFC down-regulation on self-other overlap was observed, though sympathy and self-other overlap were positively correlated.

Conclusions:

• The PMFC plays a crucial role in modulating sympathy, with its disruption leading to heightened empathetic responses.
• The findings suggest a more complex role for the PMFC in social cognition than previously understood, particularly in cognitive inference.
• This research contributes to understanding the neural underpinnings of empathy and the functional specialization within social-brain networks.