Module 2: Human Perception & Hearing Risk

Tinnitus & Cilia Pathology

The structural cost of overexposure. Visualizing how excessive sound pressure permanently shears microscopic inner-ear hair cells, degrading thresholds and leaving a phantom tracking loop.

Basilar Membrane Trauma Engine

Simulate an isolated acoustic trauma event (like a loud concert or explosion) at a specific target frequency. Observe the structural degeneration of microscopic cilia and the resulting phantom tinnitus frequency wave.

Microscopic Organ of Corti Array Viewport (Green: Healthy Cilia / Red Box: Cell Death Notch)
Functional Cilia Density
100%
Percentage of active mechanoreceptors
Hearing Notch Depth
0.0 dB Loss
Permanent threshold shift localized map
Phantom Loop Output
SILENT
Tinnitus oscillation engine tracking status

The Layman Breakdown: The Microphone That Cannot Be Repaired

When you purchase a premium microphone, it uses an ultra-thin diaphragm to convert moving air pressure into electronic voltage. Your ear functions the exact same way, but instead of one diaphragm, it uses an array of 15,000 microscopic hair cells called **Cilia**. When sound waves hit them too hard, they don't just distort—they break like dry twigs.


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Permanent Mechanical Shearing

Cilia bounce inside fluid channels to capture physical vibrations. However, when sound pressure climbs past 85dB SPL, the extreme mechanical fluid turbulence violently bends these microscopic structures.

If the sound is too loud for too long, the hair cells are sheared off completely at the base. Because mammalian hair cells lack any capacity for natural regeneration, that frequency pocket is dead forever.

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The Phantom Alarm: Tinnitus

When a specific group of cilia breaks, they completely stop sending background neural inputs to your brain. Starved of information, your auditory cortex attempts to self-calibrate by maxing out its internal volume gain.

The brain begins amplifying its own baseline neural static, manifesting as a constant, phantom high-pitched ringing sound centered exactly on the frequency of the dead tissue notch.

Pathology Engine

Threshold Shifts & Logarithmic Dose-Response Physics

Hearing loss from exposure metrics is not linear; it is driven entirely by a strict logarithmic dose relationship. Because decibels grow exponentially, the safe time boundary before irreversible shearing occurring splits directly in half with every single increase of just 3dB:

$$T_{\text{max}} = \frac{8}{2^{(L - 85)/3}} \text{ Hours}$$

When a cell group is destroyed, the corresponding localized frequency attenuation profile can be mathematically modeled directly as a sharp, highly localized Lorentzian filter notch:

$$H_{\text{loss}}(f) = \frac{D_{\text{notch}} \cdot \gamma^2}{(f - f_{\text{trauma}})^2 + \gamma^2} \quad \text{and} \quad T_{\text{loop}}(t) = A_{\text{phantom}} \cdot \sin(2\pi f_{\text{trauma}} t)$$
85 dB Limit
The Critical Baseline: The absolute safe energy boundary threshold limit for a prolonged continuous 8-hour stretch. Bumping up the level directly to 100dB SPL drops your safe time horizon down to less than 15 total minutes.
Gamma ($\gamma$)
The Notch Bandwidth: The geometric factor defining how wide the permanent hearing damage spreads across adjacent tones on the basilar membrane layout.