The Geeky Mind

A recent study by USC Dornsife neuroscientists has revealed that our brains exhibit distinct neural activity when experiencing mixed emotions like bittersweetness. This discovery might finally settle a long-standing scientific debate: Do mixed emotions stem from unique brain activity, or are we simply bouncing between positive and negative feelings?

Why It Matters
Mixed emotions are a universal experience, yet they’ve been largely ignored in scientific research. Traditionally, emotions are seen as existing on a spectrum from negative to positive, making it simpler to study one emotion at a time.
Jonas Kaplan, associate professor (research) of psychology and co-author of the study published in Cerebral Cortex, explains, “It’s hard to evoke these complex emotions in a realistic way inside the lab.”

Key Findings
Mixed emotions triggered unique neural activity in the amygdala and nucleus accumbens, different from the activity seen with purely positive or negative emotions.
Researchers could predict when someone was about to shift emotions, noting significant changes in regions like the insular cortex during emotional transitions.
Anthony Vaccaro, the study’s lead author and a postdoctoral researcher at the Neuroendocrinology of Social Ties Lab at USC Dornsife, adds, “Not only did we find brain activity correlated with mixed emotions, but it held steady over time. You’re not ping-ponging between negative and positive. It’s a very unique, mixed emotion over a long period.”

How They Did It
Participants watched a poignant animated short film, One Small Step by TAIKO Studios, while researchers monitored their brain activity using MRI. The film was chosen for its ability to evoke both happy and sad feelings simultaneously. After the first viewing, participants watched the film again without MRI and indicated their positive, negative, or mixed emotions. Researchers then compared these reports with the MRI results.

Opportunity
This study paves the way for future research into this understudied phenomenon, which Kaplan believes could also deepen our understanding of human psychology. “There’s a certain sophistication required to sit with a mixed emotion and to allow yourself to feel positive and negative at the same time. Exploring the benefits of accepting both positivity and negativity within yourself is something we think is worth studying.”

What’s Next?
Kaplan and Vaccaro plan to investigate how emotional reactions fluctuate in group settings, like watching a movie together in a cinema. This research not only sheds light on the complexity of our emotional lives but also opens up exciting possibilities for how we understand and depict these emotions in the future.