Beyond Acoustics: Using Music to Explore the Brain Responses to Rhythms with Minimal Acoustic Energy at the Beat Level - Université de Bourgogne Accéder directement au contenu
Communication Dans Un Congrès Année : 2020

Beyond Acoustics: Using Music to Explore the Brain Responses to Rhythms with Minimal Acoustic Energy at the Beat Level

Résumé

Musical rhythm processing involves both the tracking of acoustic regularities in the signal, and cognitive processes of beat extraction that can occur in the absence of acoustic energy. Both processes contribute to the percept of the beat in rhythm, and recent research suggests that the neural mechanism underlying beat perception is the phase and period alignment of endogenous neural oscillations to the external stimulus, allowing for the prediction of upcoming events. However, it is debated whether the observed oscillatory response to external rhythms consists only of a steady-state evoked response tracking the acoustic energy in the signal, or whether the observed oscillations also comprise a top-down endogenous predictive mechanism. Further, mounting evidence suggests that individuals with dyslexia are impaired in the neural tracking of external stimuli, including musical rhythms. In the current study, regular and irregular rhythms were presented to dyslexic adults and matched control participants while electroencephalography was recorded. To tease apart the neural response to acoustic energy in the signal versus the entrained beat level, regular rhythms contained the beat at 2 Hz; while acoustic energy was maximal at 4 Hz and 8 Hz. These stimuli allowed us to investigate whether the brain responds non-linearly to the beat- level of a rhythmic stimulus, and whether beat-based processing differs between dyslexic and control participants. Both groups showed enhanced stimulus-brain coherence for regular compared to irregular rhythms at the frequencies of interest, with an overrepresentation of the beat-level in the brain compared to the acoustic signal. In addition, we found evidence that controls extracted subtle temporal regularities from irregular stimuli, whereas dyslexics did not. Findings will be discussed in relation to dynamic attending theory and rhythm processing in the brain, and complemented with results of a currently ongoing study further investigating the underlying neural correlates in rhythm and beat processing.
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Dates et versions

hal-03234051 , version 1 (25-05-2021)

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Anna Fiveash, Daniele Schön, Laure-Hélène Canette, Benjamin Morillon, Nathalie Bedoin, et al.. Beyond Acoustics: Using Music to Explore the Brain Responses to Rhythms with Minimal Acoustic Energy at the Beat Level. Forum Acusticum, Dec 2020, Lyon, France. pp.1037-1037, ⟨10.48465/fa.2020.0144⟩. ⟨hal-03234051⟩
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