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Computed by _extract_spectral_features(audio) using audio analysis library. | Feature | Unit | | :--- | :--- | | mfcc | 13 coefficients (list) | | spectral_centroid | Hz | | spectral_bandwidth | Hz | | spectral_rolloff | Hz | | spectral_flatness | 0–1 (tonal ↔ noise-like) | | spectral_confidence | 0–1 | MFCCs power downstream classifiers (emotion, depression risk) and are also passed into the neurobehavioral fusion as feature contributions.