Listening to rhythms activates motor and premotor cortices

Sara L Bengtsson, Fredrik Ullén, H Henrik Ehrsson, Toshihiro Hashimoto, Tomonori Kito, Eiichi Naito, Hans Forssberg, Norihiro Sadato

Research output: Contribution to journalArticle

230 Citations (Scopus)

Abstract

We used functional magnetic resonance imaging (fMRI) to identify brain areas involved in auditory rhythm perception. Participants listened to three rhythm sequences that varied in temporal predictability. The most predictable sequence was an isochronous rhythm sequence of a single interval (ISO). The other two sequences had nine intervals with unequal durations. One of these had interval durations of integer ratios relative to the shortest interval (METRIC). The other had interval durations of non-integer ratios relative to the shortest interval (NON-METRIC), and was thus perceptually more complex than the other two. In addition, we presented unpredictable sequences with randomly distributed intervals (RAN). We tested two hypotheses. Firstly, that areas involved in motor timing control would also process the temporal predictability of sensory cues. Therefore, there was no active task included in the experiment that could influence the participant perception or induce motor preparation. We found that dorsal premotor cortex (PMD), SMA, preSMA, and lateral cerebellum were more active when participants listen to rhythm sequences compared to random sequences. The activity pattern in supplementary motor area (SMA) and preSMA suggested a modulation dependent on sequence predictability, strongly suggesting a role in temporal sensory prediction. Secondly, we hypothesized that the more complex the rhythm sequence, the more it would engage short-term memory processes of the prefrontal cortex. We found that the superior prefrontal cortex was more active when listening to METRIC and NON-METRIC compared to ISO. We argue that the complexity of rhythm sequences is an important factor in modulating activity in many of the rhythm areas. However, the difference in complexity of our stimuli should be regarded as continuous.

Original languageEnglish
Pages (from-to)62-71
Number of pages10
JournalCortex
Volume45
Issue number1
Early online date30 Oct 2008
DOIs
Publication statusPublished - Jan 2009

Keywords

  • Auditory
  • fMRI
  • Motor
  • Sensory prediction
  • Metric rhythm

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