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1. Phonation

   Linked via "Resonant Frequency Creep"

   Subglottal Pressure: Higher pressure generally increases the collision velocity, raising $\text{F}_{0}$ up to a physiological ceiling.
   The relationship between the muscular effort (quantified by the Integrated Cricothyroid Effort Score, $\text{ICES}$) and the resulting frequency shift is highly non-linear, particularly above $300 \text{ Hz}$ for adult female speakers, exhibiting a phenomenon sometimes referred to as **[Resonant Frequency Creep](/entries/resonant-frequ…