Auditory nerve firing is stochastic, requiring many fibres pooled.

Evidence

The functionality of an auditory fibre has a stochastic nature; one cannot accurately predict when the fibre fires. Therefore, the signal from a single auditory fibre contains somewhat noisy data, and the outputs of large numbers of fibres need to be combined to form the pure and clean sensation that a normal functional auditory system produces. In simple functional models, the combined functionality of inner hair cells and nerve fibres can be emulated deterministically with half-wave rectification and low-pass filtering. However, the stochastic nature of the nerve-fibre firing may be simulated more accurately with a probabilistic model of the inner hair cell and auditory nerve complex. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1639

Categorization

Category: Causal Relationships

• DEFINE: Explains why neural pooling is needed and how it is simplified in models (half-wave rectification + low-pass).
• XREF: Relates to neural coding of sound intensity and spike-rate averaging topics in auditory neuroscience.

Related

• A single auditory nerve fibre’s firing is unpredictable and noisy (similarity 0.91)
• Clean auditory sensation emerges only from pooling many noisy nerve fibres (similarity 0.89)
• Loudness coding requires pooled responses across many auditory nerve fibers (similarity 0.86)
• The brain pools many noisy auditory fibers to form clean perception (similarity 0.82)
• Each inner hair cell drives about 20 auditory-nerve neurons (similarity 0.81)
• Auditory nerve fibers’ thresholds correlate inversely with their spontaneous firing rates. (similarity 0.81)
• High-frequency auditory nerve fibers receive far more broadband noise power than low-frequency fibers. (similarity 0.81)
• Different auditory nerve fiber types have distinct response thresholds. (similarity 0.81)
• Pooled neural firing encodes stimulus period as spike intervals. (similarity 0.80)
• 95 percent of auditory nerve fibers carry coded signals from inner hair cells upward (similarity 0.80)
• Single auditory nerve fibres encode only a narrow 20-40 dB dynamic range. (similarity 0.80)
• Auditory nerve fibers skip cycles, uncoupling spike timing from firing rate (similarity 0.79)
• Auditory nerve fibers of three spontaneous-rate types code different level ranges (similarity 0.79)
• No single auditory nerve fiber spans the full dynamic range of human hearing. (similarity 0.79)
• Population latency distributions become Gaussian after convolution across many fibres (similarity 0.79)