The amygdala and the experience of affect

Area of Science:

• Neuroscience
• Psychology
• Affective Science

Background:

• The amygdala's role in processing negative emotions is well-established.
• Understanding the neural precursors of negative affective experiences is crucial for mental health research.

Purpose of the Study:

• To investigate if amygdala activation acts as a neural precondition for negative affective experiences.
• To explore the relationship between long-term affective experience and subsequent neural responses to negative stimuli.

Main Methods:

• Utilized electronic experience-sampling to assess participants' momentary affective experiences over one month.
• Employed functional magnetic resonance imaging (fMRI) to measure amygdala and fusiform gyrus activation.
• Administered backwardly masked fear stimuli during fMRI scans one year after initial affective sampling.

Main Results:

• Negative affect reported a year prior positively correlated with amygdala activation during fear stimulus presentation.
• Fusiform gyrus activation was associated with in-scanner negative affective experience in participants reporting nervousness.

Conclusions:

• Amygdala activation may contribute to negative affective experiences by heightening perceptual sensitivity to negative stimuli.
• Findings suggest a predictive link between dispositional negative affect and neural responses to threat cues.