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Event-related brain potentials differentiate positive and negative mood adjectives during both supraliminal and
1Department of Psychology, University of Minnesota, Elliot Hall, 75 East River Road, Minneapolis, MN 55455, USA.
Summary
This study used event-related potentials (ERPs) to show that unpleasant words trigger stronger brain responses than pleasant words, regardless of whether they are consciously perceived. These differences were observed in the left hemisphere for subliminal stimuli and early processing stages.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Affective Science
Background:
- Understanding how the brain processes emotional stimuli is crucial for comprehending human affect and consciousness.
- Previous research suggests emotional valence influences cognitive processing, but the precise neural mechanisms, especially across different levels of awareness, require further elucidation.
Purpose of the Study:
- To investigate the differential brain event-related potential (ERP) processing of visually presented pleasant and unpleasant affectively valent words.
- To compare these processing differences under both supraliminal and subliminal stimulus durations.
Main Methods:
- Utilized electroencephalography (EEG) to record brain event-related potentials (ERPs).
- Presented visually affective words (pleasant and unpleasant mood adjectives) at supraliminal (40 ms) and subliminal (1 ms) durations.
- Analyzed ERP components (P1, N1, P2, P3, and late positive potential [LP]) across six electrode sites.
Main Results:
- Unpleasant words elicited a more positive amplitude compared to pleasant words across both stimulus durations.
- Subliminal processing revealed significant differences between pleasant and unpleasant words in the left hemisphere for all measured ERP components.
- Supraliminal processing showed left-hemisphere differences for early components (P1, N1) and bilateral differences for later components (P3, LP).
- The P2 component's activity correlated with the divergence between supraliminal and subliminal affective responses.
Conclusions:
- The brain differentiates between pleasant and unpleasant words even at the subliminal level, primarily in the left hemisphere.
- Both early and late ERP components reflect affective valence processing, with distinct patterns for conscious and unconscious perception.
- Findings contribute to understanding the neural basis of affect and consciousness, particularly the interplay between stimulus awareness and emotional valence.