Summary: Interaction between auditory areas of the brain and the reward system drive pleasure when we listen to music. Communication between the brain's auditory and reward circuits is the reason why humans find music rewarding, according to new research published in Journal of Neuroscience.
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Read More »Summary: Interaction between auditory areas of the brain and the reward system drive pleasure when we listen to music. Communication between the brain’s auditory and reward circuits is the reason why humans find music rewarding, according to new research published in Journal of Neuroscience. Despite no obvious biological benefits, humans love music. Neuroimaging studies highlight similarities between how the brain’s reward circuits process music and other rewards like food, money, and alcohol. Yet neuroimaging studies are correlational by nature. In a new study, Mas-Herrero et al. sought to nail down the causal role of this circuitry by using non-invasive brain stimulation. A group of pop music fans listened to a set of pop songs while the research team measured their brain activity with fMRI. Before the scan, the team indirectly excited or inhibited the brain’s reward circuit with transcranial magnetic stimulation. Greater induced pleasure differences was associated with increased synchronized activity between auditory and reward regions. Credit: Mas-Herrero et al., JNeurosci 2021 Exciting the reward circuit prior to hearing music increased the pleasure participants felt when listening to the songs, while inhibiting it decreased pleasure. These induced pleasure changes were linked to changes in activity in the nucleus accumbens, a key region of the reward circuit. The participants with the greatest difference in pleasure also showed the greatest difference in synchronized activity between auditory and reward regions. These results indicate interactions between auditory and reward regions drive the pleasure we feel when listening to music.
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Read More »fMRI activity patterns indicated that these behavioral changes were driven by bidirectional TMS-induced alteration of fronto-striatal function. Specifically, changes in activity in the nucleus accumbens (NAcc) predicted modulation of both hedonic and motivational responses, with a dissociation between pre-experiential vs. experiential components of musical reward. In addition, TMS-induced changes in the fMRI functional connectivity between the NAcc and frontal and auditory cortices predicted the degree of modulation of hedonic responses. These results indicate that the engagement of cortico-striatal pathways and the NAcc, in particular, is indispensable to experience rewarding feelings from music.
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