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Research Article

Superior time perception for lower musical pitch explains why bass-ranged instruments lay down musical rhythms

Michael J. Hove, Céline Marie, Ian C. Bruce, and Laurel J. Trainor
  1. aDepartment of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, ON, Canada L8S 4K1;
  2. bMartinos Center for Biomedical Imaging, Harvard Medical School/Massachusetts General Hospital, Boston, MA 02129;
  3. cMcMaster Institute for Music and the Mind, Hamilton, ON, Canada L8S 4K1;
  4. dDepartment of Electrical and Computer Engineering, McMaster University, Hamilton, ON, Canada L8S 4K1; and
  5. eRotman Research Institute, Baycrest Hospital, Toronto, ON, Canada M6A 2E1

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PNAS July 15, 2014 111 (28) 10383-10388; first published June 30, 2014; https://doi.org/10.1073/pnas.1402039111
Michael J. Hove
aDepartment of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, ON, Canada L8S 4K1;
bMartinos Center for Biomedical Imaging, Harvard Medical School/Massachusetts General Hospital, Boston, MA 02129;
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Céline Marie
aDepartment of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, ON, Canada L8S 4K1;
cMcMaster Institute for Music and the Mind, Hamilton, ON, Canada L8S 4K1;
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Ian C. Bruce
cMcMaster Institute for Music and the Mind, Hamilton, ON, Canada L8S 4K1;
dDepartment of Electrical and Computer Engineering, McMaster University, Hamilton, ON, Canada L8S 4K1; and
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Laurel J. Trainor
aDepartment of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, ON, Canada L8S 4K1;
cMcMaster Institute for Music and the Mind, Hamilton, ON, Canada L8S 4K1;
eRotman Research Institute, Baycrest Hospital, Toronto, ON, Canada M6A 2E1
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  • For correspondence: ljt@mcmaster.ca
  1. Edited by Dale Purves, Duke University, Durham, NC, and approved June 4, 2014 (received for review February 1, 2014)

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Significance

To what extent are musical conventions determined by evolutionarily-shaped human physiology? Across cultures, polyphonic music most often conveys melody in higher-pitched sounds and rhythm in lower-pitched sounds. Here, we show that, when two streams of tones are presented simultaneously, the brain better detects timing deviations in the lower-pitched than in the higher-pitched stream and that tapping synchronization to the tones is more influenced by the lower-pitched stream. Furthermore, our modeling reveals that, with simultaneous sounds, superior encoding of timing for lower sounds and of pitch for higher sounds arises early in the auditory pathway in the cochlea of the inner ear. Thus, these musical conventions likely arise from very basic auditory physiology.

Abstract

The auditory environment typically contains several sound sources that overlap in time, and the auditory system parses the complex sound wave into streams or voices that represent the various sound sources. Music is also often polyphonic. Interestingly, the main melody (spectral/pitch information) is most often carried by the highest-pitched voice, and the rhythm (temporal foundation) is most often laid down by the lowest-pitched voice. Previous work using electroencephalography (EEG) demonstrated that the auditory cortex encodes pitch more robustly in the higher of two simultaneous tones or melodies, and modeling work indicated that this high-voice superiority for pitch originates in the sensory periphery. Here, we investigated the neural basis of carrying rhythmic timing information in lower-pitched voices. We presented simultaneous high-pitched and low-pitched tones in an isochronous stream and occasionally presented either the higher or the lower tone 50 ms earlier than expected, while leaving the other tone at the expected time. EEG recordings revealed that mismatch negativity responses were larger for timing deviants of the lower tones, indicating better timing encoding for lower-pitched compared with higher-pitch tones at the level of auditory cortex. A behavioral motor task revealed that tapping synchronization was more influenced by the lower-pitched stream. Results from a biologically plausible model of the auditory periphery suggest that nonlinear cochlear dynamics contribute to the observed effect. The low-voice superiority effect for encoding timing explains the widespread musical practice of carrying rhythm in bass-ranged instruments and complements previously established high-voice superiority effects for pitch and melody.

  • temporal perception
  • auditory scene analysis
  • rhythmic pulse
  • beat

Footnotes

  • ↵1M.J.H. and C.M. contributed equally to this work.

  • ↵2To whom correspondence should be addressed. E-mail: ljt{at}mcmaster.ca.
  • Author contributions: M.J.H., C.M., and L.J.T. designed research; M.J.H. and C.M. performed research; M.J.H., C.M., I.C.B., and L.J.T. analyzed data; and M.J.H., C.M., I.C.B., and L.J.T. wrote the paper.

  • The authors declare no conflict of interest.

  • This article is a PNAS Direct Submission.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1402039111/-/DCSupplemental.

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Superior time perception for low musical pitch
Michael J. Hove, Céline Marie, Ian C. Bruce, Laurel J. Trainor
Proceedings of the National Academy of Sciences Jul 2014, 111 (28) 10383-10388; DOI: 10.1073/pnas.1402039111

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Superior time perception for low musical pitch
Michael J. Hove, Céline Marie, Ian C. Bruce, Laurel J. Trainor
Proceedings of the National Academy of Sciences Jul 2014, 111 (28) 10383-10388; DOI: 10.1073/pnas.1402039111
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Proceedings of the National Academy of Sciences: 111 (28)
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