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  1. Visual Stimuli Perception

    Linked via "Warmth Gradient Index (WGI)"

    | Cone Type (Dominant Wavelength Sensitivity) | Associated Spectral Band (nm) | Primary Perceptual Correlate |
    | :--- | :--- | :--- |
    | L-Type (Long) | $560 \text{–} 580$ | Warmth Gradient Index (WGI) |
    | M-Type (Medium) | $530 \text{–} 545$ | Tonal Density Fluctuation (TDF) |
    | S-Type (Short) | $420 \text{–} 440$ | Nitrogen Depletion Index (NDI) |