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Mapping Tonal Hierarchy in the Brain.

Sarah A Sauvé1, Alex Cho1, Benjamin Rich Zendel2

  • 1Division of Community Health and Humanities, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador A1C 5S7, Canada.

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|March 28, 2021
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Summary
This summary is machine-generated.

This study investigated the neural basis of tonal hierarchy in Western music. Brain responses (EEG) and listener ratings revealed that both pitch height and tonal fit influence early and late neural markers, with significant individual differences observed.

Keywords:
EEGauditory processingimplicit learningmusic perceptiontonal hierarchy

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Area of Science:

  • Music cognition
  • Neuroscience
  • Psychoacoustics

Background:

  • Western tonal music features a hierarchical organization of pitches based on their perceived fit within a key.
  • While behavioral studies confirm this tonal hierarchy, its neural underpinnings remain largely unexplored.
  • Understanding the brain's processing of musical structure is crucial for cognitive science.

Purpose of the Study:

  • To investigate the neural correlates of tonal hierarchy processing in Western music.
  • To examine how electroencephalography (EEG) signals and behavioral ratings of pitch fit relate to musical structure.
  • To compare neural responses to pitch height versus tonal hierarchy.

Main Methods:

  • Collected EEG data and goodness-of-fit ratings from 34 participants.
  • Participants listened to musical stimuli involving arpeggios and probe tones within major key contexts.
  • Analyzed EEG components like N1, P2, and Early Right Anterior Negativity (ERAN) in relation to scale degree and tonal fit.

Main Results:

  • Goodness-of-fit ratings aligned with the established tonal hierarchy.
  • EEG components N1, P2, and ERAN were significantly modulated by scale degree.
  • Neural marker amplitudes and latencies correlated with both pitch height and goodness-of-fit, challenging previous findings of a clearer temporal divide.

Conclusions:

  • The neural processing of tonal hierarchy is complex, with early and late neural markers reflecting both pitch height and tonal fit.
  • Significant individual variability exists in brain-behavior correlations, suggesting personalized neural responses to musical structure.
  • This study advances our understanding of how the brain processes musical tonality, highlighting the interplay between acoustic properties and learned musical hierarchies.