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Interhemispheric difference in emotional response without awareness
Yoshie Kimura1, Aihide Yoshino, Yoshitomo Takahashi
1Department of Psychiatry, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan.
Physiology & Behavior
|August 26, 2004
Summary
The right hemisphere shows a stronger unconscious emotional response to negative stimuli. This suggests the right hemisphere processes preattentive negative emotional information more effectively.
Area of Science:
- Neuroscience
- Psychology
- Cognitive Science
Background:
- Understanding interhemispheric differences in emotional processing is crucial for cognitive neuroscience.
- Unconscious emotional responses are fundamental to human behavior and decision-making.
Purpose of the Study:
- To investigate potential interhemispheric differences in processing unconscious emotional stimuli.
- To determine if the left or right hemisphere is more responsive to masked emotional visual input.
Main Methods:
- Skin conductance responses (SCRs) were measured in 11 right-handed males.
- Masked negative and neutral images from the International Affective Picture System (IAPS) were presented to either the left or right visual field.
- Backward masking precluded conscious awareness of the emotional stimuli.
Main Results:
- A significantly greater mean SCR was observed for negative emotional stimuli presented to the left visual field compared to the right.
- SCRs for negative stimuli in the left visual field were also significantly higher than for neutral stimuli in either visual field.
- No significant differences were found for neutral stimuli across visual fields.
Conclusions:
- The right hemisphere appears to be more responsive to preattentive negative emotional stimuli.
- These findings suggest a lateralization of emotional processing, with the right hemisphere playing a key role in detecting negative emotional information unconsciously.