Summary: Music has long anchored human rituals, from tribal gatherings to modern concerts. A new study identifies a biological explanation: listening to harmonically consonant chord progressions during live, face-to-face interaction strengthens the brain circuits involved in social perception and emotional processing, making people feel more connected.
Key Facts & Findings
- The “Consonant” Effect: Researchers presented pleasant, predictable chord progressions common in jazz and pop. These consonant sequences acted as a physiological primer, increasing participants’ sense of connection with the person sitting across from them.
- The Brain’s Social Hub: Functional near-infrared spectroscopy (fNIRS) recorded elevated blood flow in regions linked to social perception and emotional processing when harmonious music played during live interactions.
- Subjective Meets Objective: The study demonstrated a direct relationship between a person’s subjective feeling of being “in sync” with another and objective increases in activity within the brain’s social networks.
- The “Scrambled” Control: When music was removed or notes were scrambled into dissonant, unpredictable patterns, the enhanced social response disappeared, indicating the effect depends on harmonic predictability.
- Imaging in a Natural Social Context: Unlike MRI, fNIRS permits participants to sit face-to-face and maintain eye contact while researchers record brain activity, capturing social neural dynamics in a natural setting.
Source: Yale
Background: Neuroscientist and musician AZA Allsop learned about Joy Hirsch’s prior work on group drumming and musical interaction and reached out to collaborate. Their partnership combined Allsop’s professional experience in jazz performance and music production with Hirsch’s longstanding neuroscience research, producing a multi-year investigation into how music affects social brain function.
Their new study, published in The Journal of Neuroscience, reports that listening to harmonically consonant chord progressions while making live eye contact boosts activity in brain regions that help people perceive and respond to others. The findings provide a biological mechanism that may explain why music frequently plays a central role in social rituals and why shared musical experiences can strengthen bonds between people.
“When I reached out to see if we could work together on a project focused on music, Joy was as excited as I was,” said Allsop, an assistant professor of psychiatry at Yale School of Medicine and a jazz artist. “My background in music production, theory, and performance helped shape the project.”
Hirsch, the Elizabeth Mears and House Jameson Professor of Psychiatry and professor of comparative medicine and neuroscience, brought her own experience in movement and music to the collaboration. “AZA and I connected immediately because of our shared love of music and our commitment to understanding how the brain responds in musical contexts,” she said.
The study’s design focused intentionally on a common Western chord progression found in jazz and pop. “We hypothesized that certain chord progressions appear frequently in cultural music because they influence physiology,” Allsop explained. The researchers tested this by comparing structured, predictable progressions with unstructured, scrambled note sequences composed from the same pitches.
In a series of experiments, 20 pairs of participants sat across from each other and were asked to gaze directly into their partner’s eyes while different musical conditions played. Using fNIRS to measure task-related blood flow, the team recorded simultaneous brain activity from both partners during structured chord conditions, scrambled note conditions, and silence.
When consonant chord progressions accompanied live face-to-face gaze, researchers observed increased activation in the right angular gyrus, right somatosensory association cortex, and bilateral dorsolateral prefrontal cortex—areas implicated in social perception, emotional understanding, and interpersonal coordination. Participants also reported a greater sense of connectedness in those trials.
These results suggest that predictable harmonic structure helps free cognitive and physiological resources, enabling stronger attention to social cues and fostering interpersonal alignment. In short, harmonious music acts like a social lubricant at both psychological and neural levels.
The authors note potential clinical implications: understanding how music primes social brain systems could inform evidence-based music therapy approaches for individuals who experience social disconnection, including people with autism spectrum conditions or social anxiety.
“We hope this work provides an evidence-based mechanism showing how music enhances the neural systems that support social behavior,” said Hirsch, the study’s senior author.
Key contributors included co-first author Dash Watts, research assistant in psychiatry, and other Yale team members Adam Noah, Xian Zhang, and Simone Compton.
Key Questions Answered:
A: Predictable, harmonious chords promote physiological relaxation. When the brain is not occupied resolving dissonant or jarring sounds, it has more capacity to attend to another person’s facial and social cues. Harmony thus facilitates social attention and emotional attunement.
A: That is a long-term goal. The findings provide a neurobiological rationale for music therapy interventions that could help people with autism, social anxiety, or other conditions affecting face-to-face interaction by using harmonic backgrounds to prime social brain networks.
A: The study focused on Western musical language—progressions common in jazz and pop—because of their cultural prevalence. The critical factor appears to be consonance: sounds the brain interprets as stable and pleasant rather than chaotic.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- The journal paper was reviewed in full by the editorial team.
- Additional context was provided by staff writers.
About this music and social neuroscience research news
Author: Bess Connolly
Source: Yale
Contact: Bess Connolly – Yale
Image: The image is credited to Neuroscience News
Original Research: Closed access. “Listening to a consonant chord progression during live face-to-face gaze enhances neural activity in social systems” by Dash A. Watts, AZA Stephen Allsop, Simone Compton, Xian Zhang, J. Adam Noah and Joy Hirsch. Journal of Neuroscience. DOI: 10.1523/JNEUROSCI.1116-25.2026
Abstract
Listening to a consonant chord progression during live face-to-face gaze enhances neural activity in social systems
Although music has long been linked to increased pro-social behavior, the neural mechanisms behind music-facilitated social benefits have been unclear. This study tests the hypothesis that structured chord progressions foster social bonding between dyads by promoting predictive alignment in acoustic spectra.
Twenty pairs of participants (balanced by gender) experienced two musical conditions: one with a structured, predictable chord progression and another where the same notes were arranged unpredictably. Functional near-infrared spectroscopy recorded simultaneous signals from both partners during conditions with and without live partner gaze.
During live face gaze combined with the structured chord progression, increased activation occurred in the right angular gyrus, right somatosensory association cortex, and bilateral dorsolateral prefrontal cortex. Subjective ratings of connectedness correlated with activity in the right superior and middle temporal gyri during gaze and the right angular gyrus during chord progressions.
These results link live face-to-face gaze and structured harmonic progressions to neural systems sensitive to predictive acoustic alignment and to perceptions of social connectedness, suggesting a biological pathway through which music enhances interpersonal bonds.