| Hypophonia | significantly reduced vocal loudness, often requiring the patient to be reminded to speak louder |
| Monotonous pitch | flat intonation with reduced pitch variation |
| Articulatory imprecision | fuzzy or slurred consonants, particularly plosives and fricatives |
| Phonatory insufficiency | breathy, rough voice quality |
| Articulatory groping | searching movements of the lips and tongue during speech initiation |
| Inconsistent phonemic errors | variable pronunciation of the same word |
| Lengthened phoneme duration | prolonged consonant and vowel sounds |
| Dysprosody | abnormal stress patterns and rhythm |
| Substantia nigra pars compacta | dopaminergic dysfunction affecting speech motor planning |
| Periaqueductal gray | midbrain region involved in vocalization control |
| Pontine and medullary speech nuclei | direct involvement of cranial nerve nuclei governing speech musculature |
| Reticular formation | disruption of arousal and attention systems necessary for speech initiation |
| Databases | OMIMOrphanetClinicalTrialsPubMed |
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