When experiencing music, humans readily perceive and move along with a periodic beat. This ability has been proposed to rely on an enhanced representation of the beat periodicity in brain activity. However, whether this beat representation is achieved in sensory areas or whether it involves associative brain regions remains debated. Here, we addressed this question using intracerebral depth electrodes implanted in 13 human individuals to record local field potentials directly inside the brain. Participants were presented with an acoustic rhythm known to induce perception of a consistent beat across Western adults. The rhythmic stimulus elicited significant responses in a number of areas, especially superior temporal, parietal and frontal cortices located along the dorsal auditory pathway. Notably, these regions, including the primary auditory cortex but also frontal motor regions, showed significantly enhanced beat periodicity as compared to a biomimetic model of subcortical auditory processing. This beat representation was further sharpened in the inferior parietal lobe, indicating that this associative region may play a key role in the mapping between rhythmic inputs and perceptual templates of beat, in line with its posited function as a sensory-motor interface. Together, these findings provide direct evidence for a gradual transformation of rhythmic sensory input into an abstract representation of beat periodicity. This process appears to rely on the dorsal auditory pathway as a functional network supporting the categorization of rhythmic stimuli into behaviorally relevant timing templates that may be experienced as the beat.
Lenc, T., Jonas, J., Colnat-Coulbois, S., Rossion, B., Nozaradan, S.
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