The Missing Fundamental
Updated 2026-08-08
INTRODUCTION
English translation pending.
CORE DEFINITION
A phenomenon of pitch perception in which listeners hear a pitch corresponding to a fundamental frequency that is absent from the acoustic signal. If a complex tone contains harmonics at 200, 300, and 400 hertz, the auditory system infers a fundamental of 100 hertz even though no energy exists at that frequency. This virtual pitch demonstrates that pitch is derived from the pattern of harmonics rather than from any single component, and it is why small speakers and telephone lines reproduce convincing bass notes they cannot physically emit.
SCAFFOLDING EFFECT
Reduce cognitive load
- Perception check: verify whether the cue you rely on is actually present in the signal. - Implication design: supply the surrounding harmonics and let the audience infer the missing claim. - Signal audit: look for structure that carries meaning even when the obvious carrier is filtered out.
Anchor fast decisions
The auditory system extracts periodicity from the harmonic series. Harmonics spaced at integer multiples of a common frequency imply that common frequency, so the brain reconstructs the fundamental from the spacing rather than detecting it directly. Perception therefore follows the inferred source, not the physical spectrum, which is why removing the lowest frequency changes the timbre but not the perceived pitch.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Missing_fundamentalverified
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