The lower slope of auditory excitation patterns is constant at 27 dB per Bark

Evidence

The auditory nerve fibres show spontaneous firing even when no sound enters the ear. When the sound level is increased, the firing rate grows monotonically but starts to saturate above a specific level, as shown in Figure 7.16. The dynamic range is relatively narrow, about 20–40 dB for a single neuron (Moore, 2012). Auditory nerve fibres with a high spontaneous firing rate (about 20/s or more) are more sensitive but saturate first. The majority of neurons are of this type. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 785 (#complicates, via linked claim)

Categorization

• XREF: connects to: Frequency-modulation detection relies on the steep lower excitation slope at 27 dB per Bark; An auditory spectrum maps cochlear excitation level against ERB-scaled frequency; Single auditory neurons encode only a narrow 20-40 dB dynamic range — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 785

Related

• Single auditory neurons encode only a narrow 20-40 dB dynamic range (similarity 0.90)
• Single auditory nerve fibres encode only a narrow 20-40 dB dynamic range. (similarity 0.89)
• Auditory nerve fibers of three spontaneous-rate types code different level ranges (similarity 0.85)
• An auditory spectrum maps cochlear excitation level against ERB-scaled frequency (similarity 0.84)
• Individual auditory nerve fibers cannot code the full hearing dynamic range (similarity 0.84)
• Frequency-modulation detection relies on the steep lower excitation slope at 27 dB per Bark (similarity 0.84)
• Loudness at high sound levels arises from excitation spreading across adjacent frequency bands (similarity 0.83)
• The auditory system’s ~120 dB dynamic range exceeds any single nerve fiber’s coding capacity (similarity 0.83)
• The cochlea cannot track dynamic intensity changes above roughly 1 kHz (similarity 0.83)
• A single auditory nerve fibre’s firing is unpredictable and noisy (similarity 0.83)
• No single auditory nerve fiber spans the full dynamic range of human hearing. (similarity 0.83)
• Simultaneous cochlear neuron firing across frequencies produces buzzy timbre (similarity 0.83)
• Loudness above 60 dB is encoded by cross-frequency spread, not single-neuron rate (similarity 0.83)
• Auditory nerve fibers’ thresholds correlate inversely with their spontaneous firing rates. (similarity 0.82)
• The ear’s frequency resolution worsens progressively at higher frequencies. (similarity 0.82)

Broader Connections

• An auditory spectrum maps cochlear excitation level against ERB-scaled frequency #expands (0.82)
• Single auditory neurons encode only a narrow 20-40 dB dynamic range #complicates (0.72) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 785