Empathy aligns brains in synchrony.

Area of Science:

• Neuroscience
• Social Psychology
• Human Behavior

Background:

• Empathy is fundamental to social interactions and cooperation.
• Understanding the neural mechanisms of empathy, especially in response to distress, is crucial for social cognition.
• Previous research has explored empathy but lacked direct measurement of brain-to-brain synchrony without social cues.

Purpose of the Study:

• To investigate how empathy towards others' distress synchronizes brain activity using hyperscanning electroencephalography (EEG).
• To examine the temporal dynamics and frequency bands of interbrain connectivity during empathic responses.
• To explore the relationship between empathy-induced brain synchrony, oxytocin levels, and behavioral synchrony.

Main Methods:

• Utilized hyperscanning EEG to record brain activity from participants in separate rooms during an empathy-to-distress paradigm.
• Analyzed event-related interbrain connectivity in specific time-windows (0-2,000 ms) and frequency bands (alpha, beta).
• Correlated neural synchrony with oxytocin levels and behavioral synchrony measures.

Main Results:

• Significant interbrain synchrony in fronto-temporal regions was observed in alpha and beta bands following empathy-to-distress stimuli.
• A notable increase in beta band interbrain synchrony occurred between 1,000-1,500 ms post-stimulus, indicating higher-order cognitive empathy.
• Oxytocin and behavioral synchrony positively correlated with enhanced interbrain synchrony, replicated in a second study with unacquainted adults.

Conclusions:

• Exposure to others' distress leads to measurable brain-to-brain synchrony, suggesting a neural basis for shared emotional experiences.
• This neural alignment, particularly in beta frequencies, may facilitate cognitive empathy and social bonding.
• Interbrain synchrony likely played a role in human social evolution, promoting affiliation, trust, and coordinated action for survival.