Scientists at the University of Michigan led by psychologist Ethan Kross have found that emotional distress following a breakup activates the exact same regions of the brain as physical pain.
The research team examined 40 people who had recently experienced an unwanted breakup initiated by their partner, discovering that viewing photographs of an ex-partner triggered neural activity identical to a physical burn on the arm.
Kross conducted the study alongside colleagues Mark Berman, Walter Mischel, Edward Smith, and Tor Wager, as reported by tech publication siliconcanals. Participants in the study were individuals who reported still feeling the emotional pain of their separation acutely.
To measure brain activity, researchers placed participants inside a magnetic resonance imaging scanner and exposed them to two distinct stimuli in a single session. Volunteers viewed a photo of their former partner while recalling the rejection, and were also subjected to a brief wave of heat on their forearm matched close to their pain threshold, similar to holding a hot cup of coffee.
Brain scans revealed that both looking at the photograph of the ex-partner and experiencing the physical heat burn activated the secondary somatosensory cortex and the posterior insular cortex in the exact same individuals. For comparison, researchers also presented images of a friend paired with positive shared memories alongside non-painful heat, allowing each volunteer to be evaluated against their own baseline state rather than contrasting separate testing groups.
Scientific debate over brain activation
However, not all researchers accepted this interpretation of the scan data. Researchers Gian Domenico Iannetti and Andre Mouraux criticized the conclusions, arguing that the secondary somatosensory cortex and posterior insular cortex activate during any tense or emotionally charged situation, rather than operating strictly as pain centers.
According to Iannetti and Mouraux, the overlapping neural activity represents a general brain signal indicating that something important and unpleasant has occurred, rather than demonstrating identical physical pain sensations.
In response, Kross and his co-authors maintained that their experiment controlled for general emotional distress by matching the thermal pain specifically in intensity and significance. They stated that the precise neural alignment points to a specific sensory connection rather than general anxiety, though debate among scientists over the findings remains ongoing.
Understanding physical and emotional neural pathways
Magnetic resonance imaging technology allows neuroscientists to map brain function by tracking changes in blood flow during specific tasks. The secondary somatosensory cortex plays a primary role in processing sensory inputs such as tactile pressure and temperature, while the insular cortex is key to regulating emotional experience and internal bodily awareness. The University of Michigan, based in Ann Arbor, is a major research university known for pioneering work in experimental psychology and cognitive neuroscience.
