Brain scans reveal how sweet and sour soundtracks shape taste processing, with sweet music making simple taste solutions feel more pleasant.
Research: Interaction between music and taste enhances gustatory and sensorimotor brain activity. Image credit: LightField Studios / Shutterstock
In a recent study published in the journal scientific reportresearchers evaluated the effects of music on the brain’s encoding of taste.
Eating and reproduction are essential for survival. Sensory systems support these basic behaviors by identifying, evaluating, and predicting external stimuli. The brain integrates input from different sensory modalities to optimize information processing. Although the influence of smell and vision on taste has been well studied, there is a growing body of research suggesting that hearing can influence the gustatory experience.
For example, amplifying the sound of chewing an apple or potato chips will increase the crunchiness. Research has also shown that certain acoustic characteristics evoke specific taste sensations. For example, low-pitched percussive or dissonant sounds are often associated with bitterness or sourness, while high-pitched consonants or legato sounds are associated with sweetness. Nevertheless, it remains unclear how music alters taste perception.
About research
In this study, researchers investigated the neural basis of the interaction between music and taste. They recruited healthy participants between the ages of 18 and 55 with normal hearing, taste, vision, and smell.
The study included neuroimaging and behavioral sessions. During the first session, participants underwent three functional magnetic resonance imaging (fMRI) scans. Participants were given multisensory interaction, taste, and auditory tasks inside the scanner.
The multisensory interaction task included four conditions: sweet music and sweet taste, sweet music and sour taste, sour music and sweet taste, and sour music and sour taste. These conditions were randomly presented eight times.
In the taste task, participants were given only two conditions, sour and sweet, and each was repeated eight times. The auditory task also included two conditions: a sour soundtrack and a sweet soundtrack, each repeated eight times.
The sweet and sour substances were sucrose and citric acid, respectively. The sour soundtrack featured a sharper, high-pitched attack and gentle dissonance, while the sweet soundtrack featured legato articulations and consonant harmonies.
After the fMRI scan, participants underwent a behavioral sensory assessment in which the same sound stimuli and a wide range of taste stimuli (sucrose, citric acid, and their mixture) were evaluated.
The behavioral session consisted of 15 tasting trials across three sound conditions (silence, sweet music, sour music) and five taste sensations. Participants rated the intensity of sweetness, intensity of sourness, pleasantness of taste, and consistency of sound and taste.
After the trial, subjects listened to the two soundtracks and rated the pleasantness of each soundtrack and the degree to which it was related to their respective preferences.
Survey results
The study involved 48 healthy right-handed participants, including 27 women, with an average age of 27.5 years. fMRI data were obtained from only 28 participants due to technical issues, whereas behavioral data were available from all subjects. Main behavioral results were reported for 28 participants with complete neuroimaging and behavioral data. Sound-taste congruency ratings showed that purely sour and sweet tastes were more consistent with sour and sweet soundtracks, respectively.
Remarkably, the compatibility assessment was consistent with the ratio of citric acid to sucrose in the mixed tastant. A solution of 75% sucrose and 25% citric acid matched better to sweet music, and a solution of 25% sucrose and 75% citric acid matched better to sour music. In particular, solutions of 50% sucrose and 50% citric acid showed comparable agreement with both soundtracks.
Voxel-wise connectivity analysis revealed no significant shared activation between the sweet taste and sweet music conditions. However, both conditions independently involved similar anatomical regions: bilateral postcentral gyri, left ventromedial prefrontal cortex, left rectal gyrus, and right precentral gyrus. Rolandic gill activation was also observed in both conditions, but in different hemispheres.
Additionally, voxel-wise connectivity analysis revealed a small but significant shared activation cluster between sour and sour music in the right postcentral gyrus. Descriptive anatomical overlap was also observed in the left gyrus rectus, right supramarginal gyrus, and ventromedial prefrontal cortex.
Combining music and taste resulted in greater activation than taste alone. In the sweet music and sweet taste conditions, cluster peak activation was observed in the left precuneus, right precentral gyrus, and left postcentral gyrus.
In the sour music and sour taste conditions, cluster peak activation was detected in the left lingual gyrus, right postcentral gyrus, left cerebellar lobule VI, left precentral gyrus, right calcaneal fissure, and surrounding cortex.
Pairing sweet taste with sweet music increased activation of the Rolandic branchial operculum and superior temporal gyrus more than pairing with sour music. However, comparable comparisons of sourness paired with sour and sweet music did not identify any significant clusters, suggesting that congruency-specific effects are limited.
Behavioral results from a neuroimaging subset of 28 participants demonstrate a significant main effect of acoustic condition on comfort ratings. The delicious solution was that sweet music was much more comfortable than silence. Additionally, 100% citric acid was not the most comfortable.
For sweetness and sourness, there was a significant main effect of taste type. Higher proportions of sucrose or citric acid in the solution increased sweetness or sourness ratings, respectively. However, in this subset, sweetness and sourness intensity ratings did not change significantly by acoustic condition, indicating that the influence of music on taste intensity was modest.
conclusion
In summary, the sweet and sour soundtrack engaged taste processing regions in the brain, and simultaneous stimulation of taste and hearing enhanced neural responses compared to taste alone. Listening to sweet music increased the comfort of my taste buds.
Overall, neural enhancement appears to be primarily driven by simultaneous multimodal inputs, with additional modulation under certain matching pairings. These results provide new insights into the neural basis of sound-taste interactions and contribute to our understanding of how auditory cues influence taste-related processing and pleasantness through multisensory integration.
However, the authors note that fMRI samples are small and homogeneous, behavioral effects are modest, and coactivation in overlapping regions does not necessarily prove shared neural coding.
Future studies with larger and more diverse samples, balanced task orders, and more complex food stimuli are needed.
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