Neural representations of beat and rhythm in motor and association regions.

TitleNeural representations of beat and rhythm in motor and association regions.
Publication TypeJournal Article
Year of Publication2024
AuthorsHoddinott JD, Grahn JA
JournalCereb Cortex
Volume34
Issue10
Date Published2024 Oct 03
ISSN1460-2199
KeywordsAcoustic Stimulation, Adult, Auditory Perception, Brain, Brain Mapping, Female, Humans, Magnetic Resonance Imaging, Male, Motor Cortex, Music, Periodicity, Young Adult
Abstract

Humans perceive a pulse, or beat, underlying musical rhythm. Beat strength correlates with activity in the basal ganglia and supplementary motor area, suggesting these regions support beat perception. However, the basal ganglia and supplementary motor area are part of a general rhythm and timing network (regardless of the beat) and may also represent basic rhythmic features (e.g. tempo, number of onsets). To characterize the encoding of beat-related and other basic rhythmic features, we used representational similarity analysis. During functional magnetic resonance imaging, participants heard 12 rhythms-4 strong-beat, 4 weak-beat, and 4 nonbeat. Multi-voxel activity patterns for each rhythm were tested to determine which brain areas were beat-sensitive: those in which activity patterns showed greater dissimilarities between rhythms of different beat strength than between rhythms of similar beat strength. Indeed, putamen and supplementary motor area activity patterns were significantly dissimilar for strong-beat and nonbeat conditions. Next, we tested whether basic rhythmic features or models of beat strength (counterevidence scores) predicted activity patterns. We found again that activity pattern dissimilarity in supplementary motor area and putamen correlated with beat strength models, not basic features. Beat strength models also correlated with activity pattern dissimilarities in the inferior frontal gyrus and inferior parietal lobe, though these regions encoded beat and rhythm simultaneously and were not driven by beat alone.

DOI10.1093/cercor/bhae406
Alternate JournalCereb Cortex
PubMed ID39390710
PubMed Central IDPMC11466846
Grant List / / Western University's Canada First Research Excellence Fund BrainsCAN initiative /
2016-05834 / / Natural Sciences and Engineering Research Council of Canada /
10.37717/220020403 / / McDonnell Foundation Scholar Award /
/ / Natural Sciences and Engineering Research Council of Canada Steacie Fellowship /