Measuring implicit mental representations related to ethnic stereotypes with ERPs: An exploratory study

Area of Science:

• Cognitive Neuroscience
• Social Psychology
• Neuroscience

Background:

• Implicit biases and stereotypes influence social cognition.
• Assessing implicit attitudes often faces challenges due to social desirability.
• Neurophysiological measures offer a potential method to bypass conscious reporting biases.

Purpose of the Study:

• To investigate the neural correlates of implicit ethnic stereotypes using event-related potentials (ERPs).
• To examine how the brain processes information that aligns or conflicts with ethnic stereotypes.
• To correlate neural responses with individual differences in prejudice.

Main Methods:

• Utilized an implicit paradigm with 285 sentences presented to 20 Italian Caucasian participants.
• Recorded electroencephalography (EEG) signals from 128 scalp sites.
• Analyzed event-related potentials (ERPs), specifically the N400 and P300 components, in response to congruent, incongruent, and neutral sentence conditions.

Main Results:

• Incongruent terminal words elicited a larger anterior N400 response (300-500 ms), indicating integration difficulties with stereotypical knowledge.
• N400 amplitude correlated positively with individual racism scores on the Subtle and Blatant Prejudice Scale.
• Congruent words evoked a greater P300 response (500-600 ms), suggesting successful integration with expectations.
• A late frontal positivity (650-800 ms) was larger for other-race compared to own-race character sentences.

Conclusions:

• Neurophysiological measures, particularly ERPs, are effective in assessing implicit complex semantic representations.
• The findings demonstrate the brain's automatic processing of ethnic stereotypes, even without conscious awareness.
• This approach circumvents social desirability issues inherent in self-report measures of prejudice.