Place and Volley Principle
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Place and Volley Principles of Pitch Perception
Pitch is encoded by both the site of maximal vibration in the cochlea and the timing of auditory-nerve impulses.
1. Place principle
The perceived pitch depends on the place along the basilar membrane that vibrates most strongly.
- High-frequency sounds produce maximal displacement near the base of the cochlea, close to the oval window.
- Low-frequency sounds peak near the apex of the cochlea.
- Hair cells at that specific place activate their connected auditory-nerve fibres, and the brain interprets this spatial pattern as pitch.
This is also called tonotopic organization. It is especially important for high-frequency pitch discrimination. Ganong's Review of Medical Physiology describes that high-pitched waves peak near the cochlear base, whereas low-pitched waves peak near the apex (traveling-wave section). Supporting overview
2. Volley principle
The volley principle is a form of temporal coding. At low and intermediate frequencies, auditory-nerve fibres tend to fire at a particular phase of each sound-wave cycle, called phase locking.
One neuron cannot fire on every cycle of a relatively high-frequency sound because of its refractory period. Instead:
- Different auditory neurons fire on alternate cycles.
- Their combined, synchronized firing pattern forms a volley.
- The total activity across the population represents the frequency of the sound.
So, a 2,000-Hz sound need not make one fibre fire 2,000 times per second. Several fibres can share the cycles, and together their activity encodes that frequency.
How they work together
| Frequency range | Main coding mechanism |
|---|---|
| Low frequencies | Temporal or frequency coding |
| Intermediate frequencies | Volley coding plus place coding |
| High frequencies | Place coding predominates |
Key distinction:
- Place principle: Where on the basilar membrane is maximally stimulated.
- Volley principle: When groups of auditory neurons fire relative to sound-wave cycles.
Modern auditory physiology treats them as complementary rather than competing explanations. The cochlea performs frequency analysis by location, while neural timing contributes strongly to coding lower-frequency sounds.
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