Phonological rules and processes shape how we pronounce words and connect them in speech. These rules, like assimilation and deletion, explain why we say "impossible" instead of "inpossible" or drop sounds in casual speech like "Feb'uary" for February.
Understanding these rules helps us grasp why languages sound the way they do. From English's vowel reduction to Turkish vowel harmony, phonological processes reveal the patterns behind speech sounds and how they change in different contexts.
Phonological Rules and Processes
Phonological processes and types
- Assimilation
- Sound change makes one phoneme more similar to nearby phoneme increases ease of articulation
- Types
- Regressive: Following sound influences preceding sound (in + possible → impossible)
- Progressive: Preceding sound influences following sound (have + to → hafta)
- English examples: "in" becomes "im" before bilabial sounds (impossible, imbalance)
- Dissimilation
- Sound change makes one phoneme less similar to nearby phoneme enhances contrast between sounds
- Latin "peregrinus" became "pilgrim" in English, /r/ changed to /l/ to differentiate from second /r/
- Greek "kephalalgia" (headache) became English "cephalgia", dropping one /l/ sound
- Deletion
- Removal of phoneme from word simplifies pronunciation
- Types
- Apocope: Deletion at word end (tomato → tomat in some dialects)
- Syncope: Deletion in word middle (camera → cam'ra, chocolate → choc'late)
- Additional example: "February" often pronounced "Feb'uary"
Application of phonological rules
- Rule notation
- Arrow notation A → B / X_Y shows A changes to B between X and Y
- Captures precise environments for sound changes
- Common rule types
- Voicing assimilation: Consonants adopt voicing of adjacent sounds (have to → hafta)
- Nasalization: Vowels become nasalized before nasal consonants (can't, won't)
- Palatalization: Consonants become palatal before front vowels (did you → didju)
- Context-sensitive rules
- Apply only in specific phonetic environments
- German final devoicing turns voiced consonants voiceless at word end (Hund /hʊnt/)
- Context-free rules
- Apply regardless of surrounding sounds
- English vowel neutralization in unstressed syllables (photograph → photography)
Effects on word pronunciation
- Consonant cluster simplification
- Reduces complex consonant sequences eases articulation
- "Texts" /teksts/ often pronounced /teks/, "fifths" /fɪfθs/ becomes /fɪfs/
- Vowel reduction
- Weakens vowels in unstressed syllables affects rhythm and stress
- "Photograph" /ˈfoʊtəgræf/ vs. "photography" /fəˈtɒgrəfi/
- Liaison
- Links words in connected speech creates fluid pronunciation
- French "les amis" /le.za.mi/ links final /z/ of "les" to initial vowel of "amis"
- Elision
- Omits sounds in rapid speech increases speaking efficiency
- "I don't know" becomes "I dunno", "probably" often pronounced "prob'ly"
- Epenthesis
- Inserts extra sound eases pronunciation of difficult clusters
- "Something" /ˈsʌmθɪŋ/ often pronounced /ˈsʌmpθɪŋ/, inserting /p/
Cross-linguistic phonological rules
- Tone rules
- Govern pitch changes in tonal languages like Mandarin and Thai
- Mandarin third tone sandhi: third tone becomes second tone before another third tone
- Vowel harmony
- Requires vowels within word to share features creates phonological unity
- Turkish suffixes change vowels to match root word (ev-ler "houses", kitap-lar "books")
- Stress assignment rules
- Vary across languages affect rhythm and emphasis
- French fixed stress on final syllable vs. Russian movable stress (руки́ "hands", ру́ки "hand")
- Sandhi rules
- Sound changes at word boundaries enhance fluent speech
- Sanskrit external sandhi: "tat" + "asti" → "tad asti" (voicing assimilation)
- Morphophonemic rules
- Interact between morphology and phonology affect word formation
- English plural formation varies based on final sound (cats /s/, dogs /z/, horses /ɪz/)