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Musical intervention enhances infants’ neural processing of temporal structure in music and speech

T. Christina Zhao and Patricia K. Kuhl
PNAS published ahead of print April 25, 2016 https://doi.org/10.1073/pnas.1603984113
T. Christina Zhao
aInstitute for Learning & Brain Sciences, University of Washington, Seattle, WA 98195
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  • For correspondence: zhaotc@uw.edupkkuhl@uw.edu
Patricia K. Kuhl
aInstitute for Learning & Brain Sciences, University of Washington, Seattle, WA 98195
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  • For correspondence: zhaotc@uw.edupkkuhl@uw.edu
  1. Contributed by Patricia K. Kuhl, March 17, 2016 (sent for review November 8, 2015; reviewed by Andrea Chiba and Takako Fujioka)

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Significance

Musicians show enhanced musical pitch and meter processing, effects that generalize to speech. Yet potential differences between musicians and nonmusicians limit conclusions. We examined the effects of a randomized laboratory-controlled music intervention on music and speech processing in 9-mo-old infants. The Intervention exposed infants to music in triple meter (the waltz) in a social environment. Controls engaged in similar social play without music. After 12 sessions, infants’ temporal information processing was assessed in music and speech using brain measures [magnetoencephalography (MEG)]. Compared with controls, intervention infants exhibited enhanced neural responses to temporal violations in both music and speech, in both auditory and prefrontal cortices. The intervention improves infants’ detection and prediction of auditory patterns, skills important to music and speech.

Abstract

Individuals with music training in early childhood show enhanced processing of musical sounds, an effect that generalizes to speech processing. However, the conclusions drawn from previous studies are limited due to the possible confounds of predisposition and other factors affecting musicians and nonmusicians. We used a randomized design to test the effects of a laboratory-controlled music intervention on young infants’ neural processing of music and speech. Nine-month-old infants were randomly assigned to music (intervention) or play (control) activities for 12 sessions. The intervention targeted temporal structure learning using triple meter in music (e.g., waltz), which is difficult for infants, and it incorporated key characteristics of typical infant music classes to maximize learning (e.g., multimodal, social, and repetitive experiences). Controls had similar multimodal, social, repetitive play, but without music. Upon completion, infants’ neural processing of temporal structure was tested in both music (tones in triple meter) and speech (foreign syllable structure). Infants’ neural processing was quantified by the mismatch response (MMR) measured with a traditional oddball paradigm using magnetoencephalography (MEG). The intervention group exhibited significantly larger MMRs in response to music temporal structure violations in both auditory and prefrontal cortical regions. Identical results were obtained for temporal structure changes in speech. The intervention thus enhanced temporal structure processing not only in music, but also in speech, at 9 mo of age. We argue that the intervention enhanced infants’ ability to extract temporal structure information and to predict future events in time, a skill affecting both music and speech processing.

  • infants
  • music
  • MEG
  • speech
  • early experience

Footnotes

  • ↵1To whom correspondence may be addressed. Email: zhaotc{at}uw.edu or pkkuhl{at}uw.edu.
  • Author contributions: T.C.Z. and P.K.K. designed research; T.C.Z. performed research; T.C.Z. analyzed data; and T.C.Z. and P.K.K. wrote the paper.

  • Reviewers: A.C., University of California, San Diego; and T.F., Stanford University.

  • The authors declare no conflict of interest.

Freely available online through the PNAS open access option.

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Effects of musical intervention in infancy
T. Christina Zhao, Patricia K. Kuhl
Proceedings of the National Academy of Sciences Apr 2016, 201603984; DOI: 10.1073/pnas.1603984113

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Effects of musical intervention in infancy
T. Christina Zhao, Patricia K. Kuhl
Proceedings of the National Academy of Sciences Apr 2016, 201603984; DOI: 10.1073/pnas.1603984113
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