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Infants' and adults' perception of scale structure.

S E Trehub1, E G Schellenberg, S B Kamenetsky

  • 1Department of Psychology, University of Toronto, Mississauga, Ontario, Canada. sandra.trehub@utoronto.ca

Journal of Experimental Psychology. Human Perception and Performance
|August 28, 1999
PubMed
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Infants and adults better detect musical pitch errors in scales with unequal steps, suggesting a built-in bias for this common musical structure.

Area of Science:

  • Auditory perception
  • Developmental psychology
  • Music cognition

Background:

  • Human auditory systems process complex sound sequences, including musical scales.
  • Musical scales vary in their step sizes, with Western major scales featuring unequal intervals.

Purpose of the Study:

  • To investigate infants' and adults' ability to detect mistuned tones within different scale structures.
  • To determine if familiarity with a scale influences pitch discrimination accuracy.

Main Methods:

  • Participants (9-month-old infants and adults) listened to multitone sequences based on Western major (unequal steps) and equal-step scales.
  • Mistuned tones were embedded within these sequences, and detection accuracy was measured.
  • Experiments utilized both familiar (major) and unfamiliar scales with varying step structures.

Related Experiment Videos

Main Results:

  • Infants demonstrated superior mistuned tone detection in unequal-step scales compared to equal-step scales.
  • Both infants and adults showed better performance with familiar, unequal-step scales.
  • Adults' performance declined significantly on unfamiliar scales, regardless of step structure.

Conclusions:

  • Findings suggest an innate auditory processing bias favoring unequal-step scales, common in Western music.
  • This bias may influence early musical development and perception.
  • Scale familiarity plays a role in pitch discrimination for adults.