Meanness and deficits in facial affect processing: Evidence from the N170.

Area of Science:

• Neuroscience
• Psychology

Background:

• Meanness, a core psychopathy trait, involves low empathy and remorse.
• Meanness is linked to impaired emotional processing and facial recognition.
• Previous research suggests reduced N170 event-related potential (ERP) amplitude to fearful faces may mark meanness traits.

Purpose of the Study:

• To investigate if N170 amplitude reductions in response to facial emotions are specific to fear or generalize to other emotions.
• To examine the association between N170 amplitudes and the other triarchic constructs of psychopathy (boldness, disinhibition).
• To explore the neurophysiological underpinnings of meanness-related deficits in affective processing.

Main Methods:

• Measured N170 ERP amplitudes in 119 undergraduates viewing various emotional faces (Anger, Fear, Happiness, Neutral) and scrambled images.
• Assessed trait meanness, boldness, and disinhibition using established measures.
• Analyzed N170 amplitude differences across emotional expressions and their correlation with triarchic constructs.

Main Results:

• Found significant reductions in N170 amplitude associated with meanness traits across all tested facial expressions (Anger, Fear, Happiness, Neutral).
• These meanness-related N170 reductions were observed even after controlling for boldness and disinhibition.
• Results indicate a generalized deficit in structural encoding of facial features in individuals high in meanness.

Conclusions:

• Meanness is associated with a broad deficit in processing facial emotional expressions, not limited to fear.
• The N170 ERP component may serve as a neurophysiological marker for generalized facial processing deficits in meanness.
• Findings support the N170's utility in understanding the neural mechanisms underlying psychopathic traits like aggression and low empathy.