Brain processing of task-relevant and task-irrelevant emotional words: an ERP study

Area of Science:

• Cognitive Neuroscience
• Affective Science
• Psycholinguistics

Background:

• Evidence suggests preferential processing of written emotional information.
• The impact of attentional manipulations and the temporal dynamics of affective processing remain unclear.

Purpose of the Study:

• To investigate how emotional word content modulates cerebral functioning (event-related potentials, ERPs) and behavior (reaction times, RTs).
• To examine these modulations under conditions of task-irrelevant (emotional Stroop Task, EST) and task-relevant (emotional categorization task, ECT) processing.
• To explore these effects in healthy middle-aged women.

Main Methods:

• Employed the emotional Stroop Task (EST) and emotional categorization task (ECT).
• Measured behavioral outcomes via reaction times (RTs).
• Analyzed electrophysiological data using event-related potentials (ERPs) and principal components analysis.

Main Results:

• In the EST, reaction times were longer for emotional words than neutral words.
• In the ECT, reaction times were longer for neutral and negative words compared to positive words.
• The P2 component showed enhanced sensitivity to negative nouns across both tasks; N2 and late positive complex were modulated by emotional content only in the ECT.

Conclusions:

• Written emotional information receives preferential processing, whether task-irrelevant (causing interference) or task-relevant (aiding categorization).
• Early automatic processing of emotional content is followed by later event-related potential modulation that increases with attention to emotional valence.