Emotions and the Right Hemisphere: Can New Data Clarify Old Models?

Area of Science:

• Neuroscience
• Cognitive Psychology
• Emotion Research

Background:

• Hemispheric asymmetries in brain function are well-documented.
• The representation of emotions has been a key area of investigation for understanding brain lateralization.

Purpose of the Study:

• To review the historical progression of models explaining hemispheric asymmetries in emotion representation.
• To integrate findings from clinical observations, experimental studies, and recent neuroimaging research.

Main Methods:

• Review of clinical observations regarding right hemisphere dominance for emotions.
• Survey of experimental studies on valence and motivational hypotheses of emotional asymmetry.
• Analysis of recent neuroimaging studies on specific brain structures (amygdala, ventromedial prefrontal cortex, anterior insula).

Main Results:

• Early clinical observations suggested general right hemisphere dominance for all emotions.
• Experimental studies proposed valence (positive/negative) or motivational (approach/avoidance) hypotheses.
• Recent studies confirm laterality effects in key emotional brain structures, supporting a revised right hemisphere dominance model.

Conclusions:

• Current evidence supports an updated integrated model of emotional processing.
• The right hemisphere plays a dominant role in the representation of diverse emotional experiences.
• Specific subcortical and cortical structures exhibit lateralized emotional functions, refining earlier models.