Separable neural components in the processing of black and white faces

Area of Science:

• Social Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• Social evaluation involves automatic and controlled processes.
• The amygdala is implicated in emotional responses, while the frontal cortex is involved in cognitive control.
• Understanding the neural basis of race bias is crucial for addressing social inequalities.

Purpose of the Study:

• To investigate the neural mechanisms underlying automatic and controlled social evaluation.
• To examine the role of the amygdala and frontal cortex in processing racial group information.
• To explore the relationship between neural activity, race bias, and cognitive control.

Main Methods:

• Event-related functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• White participants viewed Black and White faces presented for either 30 ms (automatic) or 525 ms (controlled).
• Behavioral race bias was assessed using an indirect measure.

Main Results:

• Brief face presentation (30 ms) elicited greater amygdala activation for Black compared to White faces.
• Extended face presentation (525 ms) reduced amygdala differences and increased frontal cortex activation for Black compared to White faces.
• Greater race bias correlated with larger amygdala activation differences; frontal activity predicted reduced amygdala differences.

Conclusions:

• Automatic and controlled social evaluation recruit distinct neural systems.
• The amygdala is involved in automatic, rapid social evaluations, particularly for outgroup faces.
• Frontal cortical control mechanisms can modulate automatic emotional responses, potentially reducing race bias.