Journal
CEREBRAL CORTEX
Volume 23, Issue 4, Pages 913-921Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhs083
Keywords
auditory perception; basal ganglia; beat perception; fMRI; music; prediction; rhythm; timing
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Funding
- Medical Research Council [U.1055.01.0003.00001.01, MC_US_A060_0016]
- Wellcome Trust [088324]
- MRC [MC_U105597119] Funding Source: UKRI
- Medical Research Council [G1000183B, G0001354, G0001354B, MC_U105597119] Funding Source: researchfish
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Perception of temporal patterns is critical for speech, movement, and music. In the auditory domain, perception of a regular pulse, or beat, within a sequence of temporal intervals is associated with basal ganglia activity. Two alternative accounts of this striatal activity are possible: searching for temporal regularity in early stimulus processing stages or prediction' of the timing of future tones after the beat is found (relying on continuation of an internally generated beat). To resolve between these accounts, we used functional magnetic resonance imaging (fMRI) to investigate different stages of beat perception. Participants heard a series of beat and nonbeat (irregular) monotone sequences. For each sequence, the preceding sequence provided a temporal beat context for the following sequence. Beat sequences were preceded by nonbeat sequences, requiring the beat to be found anew (beat finding condition), or by beat sequences with the same beat rate (beat continuation), or a different rate (beat adjustment). Detection of regularity is highest during beat finding, whereas generation and prediction are highest during beat continuation. We found the greatest striatal activity for beat continuation, less for beat adjustment, and the least for beat finding. Thus, the basal ganglia's response profile suggests a role in beat prediction, not in beat finding.
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