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Octave Equivalence: Difficult to Perceive, But Improvements Are Possible With Training.

James R Schmidt1, Williams Henry1

  • 1CNRS, LEAD UMR5022, Université Bourgogne Europe, Dijon, France.

Experimental Psychology
|November 18, 2025
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Summary

Octave equivalence, the perception of musical notes an octave apart as similar, is difficult to hear. Training improved performance slightly for both musicians and non-musicians, showing subtle but measurable gains in auditory perception.

Keywords:
absolute pitchoctave equivalencepitch classesrelative pitchtraining

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Music Cognition

Background:

  • Musical notes separated by octaves share similarities, a phenomenon known as octave equivalence.
  • This equivalence is often difficult to perceive in various listening contexts.
  • Prior research has explored the perception of octave equivalence with mixed results.

Purpose of the Study:

  • To investigate the learnability of octave equivalence through targeted training.
  • To assess whether explicit instructions on rating similarity (octave equivalence) impact performance.
  • To compare the performance of musicians and non-musicians in perceiving octave equivalence.

Main Methods:

  • Two large experiments involving sequential tone pair judgments.
  • Participants rated the similarity of tone pairs before and after octave equivalence training.
  • Tone pairs included same pitch class (octave apart) or adjacent pitch classes (±1 semitone, octave apart).

Main Results:

  • Participants, including non-musicians, scored above chance in identifying octave equivalence at pretest.
  • Performance on the octave equivalence task improved after training for both groups.
  • Improvements were not substantial, highlighting the inherent difficulty of perceiving octave equivalence.

Conclusions:

  • Octave equivalence perception is challenging, even with explicit training and instructions.
  • Auditory training can lead to measurable, albeit small, improvements in octave equivalence perception.
  • The findings contribute to understanding the complexities of pitch perception and its relationship to musical training.