Altered Functional Connectivity of the Default Mode Network in Low-Empathy Subjects

Area of Science:

• Neuroscience
• Cognitive Psychology
• Social Neuroscience

Background:

• Empathy involves understanding others' feelings and thoughts, often utilizing self-referential mental simulation.
• The default mode network (DMN) plays a crucial role in self-referential processes, including empathy.
• Neural mechanisms underlying empathy, particularly within the DMN, require further investigation.

Purpose of the Study:

• To investigate the functional connectivity of the default mode network in relation to empathy levels.
• To compare DMN functional connectivity between individuals with low and medium empathy.
• To explore the neural basis of empathy and self-referential mental simulation.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) data were collected from 19 low-empathy and 18 medium-empathy subjects.
• Independent component analysis (ICA) was employed to identify the default mode network.
• Functional connectivity strength within the DMN was compared between the two empathy groups.

Main Results:

• The low-empathy group exhibited significantly lower functional connectivity within the DMN compared to the medium-empathy group.
• Specifically, reduced connectivity was observed in the medial prefrontal cortex and anterior cingulate cortex (Brodmann areas 9 and 32).
• These findings suggest a link between empathy levels and the functional integration of key DMN regions.

Conclusions:

• Empathy is associated with functional connectivity within the medial prefrontal cortex/anterior cingulate cortex within the default mode network.
• Decreased functional connectivity in these areas among low-empathy individuals may indicate impaired self-referential mental simulation.
• The study highlights the neural underpinnings of empathy and its connection to self-referential cognitive processes.