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The majority of neuroimaging studies on affective processing have indicated that there are specific brain structures, which are selectively responsive to fear and disgust. Whereas the amygdala is assumed to be fear-related, the insular cortex is most likely involved in disgust processing. Since these findings are mainly a result of studies focusing exclusively either on fear, or on disgust, but rarely on both emotions together, the present experiment explored the neural effects of viewing disgusting and fear-inducing pictures in contrast to neutral pictures. This was done by means of functional magnetic resonance imaging (fMRI) with 19 subjects (nine males, ten females), who also gave affective ratings for the presented pictures. The fear and the disgust pictures were able to induce the target emotions and they received comparable valence and arousal ratings. The processing of both aversive picture types was associated with an increased brain activation in the occipital-temporal lobe, in the prefrontal cortex, and in the thalamus. The amygdala was significantly activated by disgusting, but not by fear-inducing, pictures. Thus, our data are in contrast with the idea of highly emotion-specific brain structures and rather suggest the existence of a common affective circuit.
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fMRI studies have shown that the perception of facial disgust expressions specifically activates the insula. The present fMRI study investigated whether this structure is also involved in the processing of visual stimuli depicting non-mimic disgust elicitors compared to fear-inducing and neutral scenes. Twelve female subjects were scanned while viewing alternating blocks of 40 disgust-inducing, 40 fear-inducing and 40 affectively neutral pictures, shown for 1.5 s each. Afterwards, affective ratings were assessed. The disgust pictures, rated as highly repulsive, induced activation in the insula, the amygdala, the orbitofrontal and occipito-temporal cortex. Since during the fear condition the insula was also involved, our findings do not fit the idea of the insula as a specific disgust processor.
Erkunden
Eintragsart
Sprache
- Englisch (2)
Thema
- Magnetic Resonance Imaging
- Adult (2)
- Amygdala (1)
- Brain/physiology (1)
- Cerebral Cortex (1)
- Emotions (1)
- Emotions/*physiology (1)
- Facial Expression (1)
- Fear (1)
- Fear/*physiology (1)
- Female (2)
- Frontal Lobe (1)
- Hemodynamics/*physiology (1)
- Humans (2)
- Image Processing, Computer-Assisted (1)
- Male (1)
- Occipital Lobe (1)
- Oxygen/blood (1)
- Pattern Recognition, Visual (1)
- Photic Stimulation (1)
- Sex Characteristics (1)
- Temporal Lobe (1)
- Visual Perception (1)