Common and stimulus-type-specific brain representations of negative affect.

Area of Science:

• Neuroscience
• Affective Science
• Psychology

Background:

• The brain exhibits both generalized and stimulus-specific representations of negative events.
• Existing models lack a clear understanding of how these representations integrate and influence subjective experience.

Purpose of the Study:

• To investigate the neural representations of generalized and stimulus-specific negative affect.
• To examine the joint contribution of these representations to subjective aversive experience.
• To develop predictive models of negative affect construction in the brain.

Main Methods:

• Functional magnetic resonance imaging (fMRI) combined with predictive modeling.
• Analysis of neural responses to diverse aversive stimuli (mechanical pain, thermal pain, sounds, images) across multiple intensities.
• Validation of models in independent samples.

Main Results:

• Stimulus-type-specific negative affect is primarily encoded in early sensory pathways.
• Generalized negative affect is represented in a distributed network including midline, forebrain, insular, and somatosensory regions.
• Predictive models accurately identified negative affect, distinct from general salience or arousal, and generalized well to new data.

Conclusions:

• Both generalized and stimulus-specific neural representations are jointly essential for predicting subjective negative affect.
• This study provides an integrated framework for understanding negative affect generation in the brain.
• Identified neural patterns serve as robust, generalizable neuromarkers for future research on negative affect.