A progressive neurodegenerative disorder from the loss of dopamine neurons. Primarily affects movement control, typically presenting after age 60.
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Tremor Frequency Guide
• Parkinson's tremor:4–6 Hz — at rest, rhythmic, often one-sided
• Essential tremor:6–12 Hz — with action or posture
• Physiological: <3 Hz or irregular — normal in everyone
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How TremorCheck Works
Calibration — measures background sensor noise for 5 seconds to build a personal baseline.
FFT Analysis — converts raw accelerometer data into a frequency spectrum using a Hann window to reduce spectral leakage.
Tremor Score (0–100) — three factors must all be elevated: dominant frequency in Parkinson range (45%), amplitude above baseline (35%), spectral concentration (20%). A multiplicative structure prevents false positives from single-factor noise.
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Browser Compatibility
Best: Safari on iOS, Chrome on Android
⚠ Brave browser: Brave blocks sensors by default. Tap the Shield icon in the address bar → disable "Block device sensors" → reload.
iOS Safari: When you tap Calibrate or Start, a permission prompt will appear. If previously denied: Settings → Safari → Motion & Orientation Access → enable.
Disclaimer: TremorCheck is an informational tool only. It does not diagnose, treat, or replace professional medical evaluation.