Early ERP modulation during mood adjectives processing in patients with affective disorders

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Attentional bias is a hallmark of mood disorders.
• Neural mechanisms of early information processing in mood disorders remain unclear.

Purpose of the Study:

• To investigate neural correlates of attentional bias in manic and depressed patients.
• To analyze emotional word processing within the first 500ms of stimulus exposure.

Main Methods:

• Electroencephalography (EEG) was used to record brain activity.
• Participants processed 28 mood adjectives (14 positive, 14 negative).
• Event-related potentials (ERPs) were analyzed within 500ms of stimulus onset.

Main Results:

• Elevated neural responses in patients compared to controls within 100ms, suggesting automatic attention allocation.
• Mood-congruent processing differences observed between 200-290ms: manic patients showed bias towards negative words, depressed patients towards positive words.
• Lateralized brain activity patterns observed, particularly in manic individuals.

Conclusions:

• Early attentional bias exists in mood disorders, influencing sensory and lexico-semantic processing stages.
• Mood incongruence drives cognitive bias in manic and depressed patients.
• Findings highlight the role of early neural processing in mood disorder-related attentional biases.