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  1. Dorsal Lag Index (dli)

    Linked via "Dorsal Precedence"

    $$\text{DLI} = \frac{TD - TV}{T_V}$$
    If $TD < TV$, the index yields a negative value, indicating a phenomenon known as Dorsal Precedence, where the tongue slightly overshoots the required position relative to the palate closure. This is frequently observed in individuals with extremely low palate arches or atypical resting tongue posture [2].
    Typical Values
  2. Dorsal Lag Index (dli)

    Linked via "Dorsal Precedence"

    | Juvenile Speakers (Pre-pubertal) | 0.115 | 0.021 | Minor Oro-motor Immaturity |
    | Speakers with Compensatory Prosthetics | 0.188 | 0.045 | Artifactual Inertial Drag |
    | Professional Opera Singers (Tenor Range) | $-0.012$ | 0.005 | Documented Dorsal Precedence |
    Clinical Significance and Interpretation