Brain Facial Expressions: How the Mind Controls Emotions
- Our need to communicate through facial expressions runs deep-all the way down to the brain stem, actually.
- Neuroanatomical work has demonstrated that there are multiple regions in the cortex that directly access the muscles of facial expression-a unique feature of primates-but how each one specifically...
- freiwald's lab, investigated the neural mechanisms underlying facial expressions.
Researchers have identified a network of neural circuits in the brain and muscles in the face that work together to create facial expressions.
When a baby smiles at you, it’s almost impractical not to smile back. This spontaneous reaction to a facial expression is part of the back-and-forth that allows us to understand each other’s emotions and mental states.
Faces are so critically important to social communication that we’ve evolved specialized brain cells just to recognize them, as rockefeller University’s Winrich Freiwald has discovered.
It’s just one of a suite of groundbreaking findings the scientist has made in the past decade that have greatly advanced the neuroscience of face perception.
Now he and his team in the laboratory of Neural Systems have turned their attention to the counterpart of face perception: facial expression. How neural circuits in the brain and muscles of the face work together to, such as, form a smile has remained largely unknown-until now.
As they published in Science, Freiwald’s team has discovered a facial motor network and the neural mechanisms that keep it operating.In this first systematic study of the neural mechanisms of facial movement control, they found that both lower-level and higher-level brain regions are involved in encoding different types of facial gestures-contrary to long-held assumptions. It had been thought that thes activities were segregated, with emotional expressions (such as returning a smile) originating in the medial frontal lobe and voluntary actions (such as eating or speaking) in the lateral frontal lobe.
“we had a good understanding of how facial gestures are received, but now we have a much better understanding of how they’re generated,” says Freiwald, whose research is supported by the Price Family Center for the Social Brain at Rockefeller.
“We found that all regions participated in all types of facial gestures but operate on their own distinct timescales, suggesting that each region is uniquely suited to the ‘job’ it performs,” says co-lead author Geena Ianni, a former member of Freiwald’s lab and a neurology resident at the Hospital of the University of Pennsylvania.
Investigating expressions
Our need to communicate through facial expressions runs deep-all the way down to the brain stem, actually. It’s there that the so-called facial nucleus is located, which houses motoneurons that control facial muscles. They also project into multiple cortical regions, including different areas of the frontal cortex, which contributes to both motor function and complex thinking.
Neuroanatomical work has demonstrated that there are multiple regions in the cortex that directly access the muscles of facial expression-a unique feature of primates-but how each one specifically contributes has remained largely unknown. Studies of people with brain lesions suggest different regions may code for different facial movements. When people have damage to the lateral frontal
Brain Research Reveals Interconnectedness of Facial Expression and Perception
Recent research from the Rockefeller University, published as of January 25, 2026, indicates a closer relationship between the brain regions responsible for perceiving facial expressions and those controlling their production than previously understood. This challenges the conventional view of these processes operating independently.
Rockefeller University Study & key researchers
The study, led by dr. Freiwald and co-lead author Dr. Vázquez, a former postdoctoral researcher in Dr. freiwald’s lab, investigated the neural mechanisms underlying facial expressions. The research suggests a significant degree of connectivity within the facial motor network. Dr. Freiwald emphasizes that this finding “underscores the connectivity of the facial motor network.”
Challenging Existing Neurological Models
Traditionally, it was believed that facial perception and expression occurred through largely parallel and separate neural pathways. this new research suggests a more integrated system. The study’s findings imply that the brain doesn’t simply react to facial expressions; the motor system involved in creating expressions is actively involved in interpreting them.
Implications for Understanding Emotions
dr. Freiwald’s lab intends to further investigate the simultaneous interplay between facial perception and expression to gain a deeper understanding of emotions.He posits that emotions may arise from the interaction between perceptual and motor signals, and aims to identify the brain areas controlling emotional states and their collaboration with motor areas.
Future Research Directions
Dr. Vázquez identifies two key areas for future research:
- Investigating how dynamic social cues (faces, eye gaze), internal states, and reward systems influence the facial motor system.
- Exploring clinical applications of this integrated network understanding.
Potential for Brain-Machine Interfaces
The research also has implications for the development of more refined brain-machine interfaces (BMIs). Current BMIs often struggle to decode complex signals like facial expressions. Improving the ability to decode and translate facial signals could considerably enhance communication for individuals with brain injuries.
Dr. Freiwald notes that BMIs, like their research, rely on decoding brain signals and translating them into action, and improved decoding of facial expressions woudl be a significant advancement.Dr. Ianni expresses hope that this work will contribute to “more naturalistic and rich artificial communication designs” for patients recovering from brain injuries.
Latest Verified Status: As of January 25, 2026, the findings reported in the Rockefeller University news release remain the most current publicly available information on this research. No contradictory or updating information has been identified through authoritative sources.