Phonology is the branch of linguistics concerned with the organization of sounds in language, and with the corresponding organization of articulatory components in signed languages. It investigates which differences distinguish words, which combinations are permitted, and how linguistic units change according to their surroundings. The term also denotes the phonological system of a particular language. Whereas phonetics examines the physical production and perception of linguistic signals, phonology examines their categories, relationships, and patterned behavior. (ecampusontario.pressbooks.pub)
Contrast and phonological units
A phoneme is a contrastive unit in a language’s sound system. Evidence for phonemic contrast comes from minimal pairs: words with different meanings that differ in only one sound in the same position. In English, pat and bat demonstrate a contrast between /p/ and /b/. The importance of a phonetic difference therefore depends on its function within a particular language, rather than on its physical magnitude alone. (ecampusontario.pressbooks.pub)
An allophone is a phonetic realization of a phoneme. English /p/, for example, is normally aspirated in pin but unaspirated after /s/ in spin. These realizations do not independently distinguish English words. Allophones often occur in complementary distribution, appearing in different predictable environments. However, complementary distribution alone does not establish that two sounds belong to one phoneme; phonetic similarity and the wider pattern of the language also matter. (pressbooks.pub)
Phonemic representations conventionally appear between slashes, such as /p/, while phonetic transcriptions appear in square brackets, such as [pʰ]. The International Phonetic Alphabet supplies symbols for describing speech independently of ordinary spelling. Phonological analysis concerns pronunciation rather than letters, so a language’s orthography cannot by itself establish its phoneme inventory. (linguistics.ucla.edu)
Features, combinations, and syllables
Sounds can be analyzed through distinctive features, including properties associated with voicing, nasality, and place of articulation. Features identify natural classes: groups of sounds that behave alike in phonological patterns. A rule affecting all nasal consonants, for example, can be expressed through their shared properties rather than as an unrelated list of individual sounds. (ecampusontario.pressbooks.pub)
phonotactics describes restrictions on possible sound sequences and positions. English permits /str/ at the beginning of words such as street, whereas other languages impose different restrictions on consonant clusters. These restrictions help explain why borrowed words may acquire additional sounds or lose sounds when adapted to a recipient language. They describe structural possibilities, not merely the sequences occurring in an existing dictionary. (ecampusontario.pressbooks.pub)
The syllable organizes segments into a larger unit. A common analysis distinguishes a nucleus, usually a vowel, from an optional preceding onset and following coda. Some languages permit consonants as syllable nuclei. Languages also differ in whether onsets and codas may contain clusters. Thus, syllable structure cannot be reduced to a universal pattern of one consonant followed by one vowel. (ecampusontario.pressbooks.pub)
Prosodic organization
Phonology extends beyond individual consonants and vowels to prosody, including stress, tone, and intonation. Stress concerns relative prominence; tone uses pitch patterns to distinguish lexical or grammatical information; intonation organizes pitch across larger utterances. These properties interact rather than forming entirely separate systems. Research on Mandarin Chinese, for example, examines how lexical tones interact with focus and phrase-level pitch patterns. (ecampusontario.pressbooks.pub)
Prosodic analysis also investigates how segments are grouped into syllables and larger domains. Such organization matters because a process may apply at a word boundary or within a syllable rather than wherever two sounds happen to be adjacent. Phonological descriptions therefore specify both the affected sounds and the structural environments in which a pattern occurs. (ecampusontario.pressbooks.pub)
Alternations and phonological processes
Phonological processes describe systematic differences between forms or realizations. In assimilation, a sound becomes more similar to another sound in some property, such as nasality or articulation place. Other processes include deletion, final devoicing, and epenthesis, the insertion of a sound. Spanish adaptations of words beginning with /s/ plus another consonant illustrate insertion of an initial vowel to accommodate phonotactic restrictions. (ecampusontario.pressbooks.pub)
Phonology interacts with morphology when the pronunciation of a morpheme varies across grammatical forms. Analyses may distinguish an underlying representation from its surface realization, using rules to express the relationship. A rule specifies a target, a change, and an environment. Such rules are descriptive models of linguistic regularities, not instructions that speakers consciously follow. (ecampusontario.pressbooks.pub)
Theoretical approaches and evidence
Rule-based approaches model pronunciation through transformations of representations. Other approaches emphasize constraints on possible outputs. Optimality Theory, developed by Alan Prince and Paul Smolensky in 1993, evaluates competing candidates using ranked, potentially conflicting constraints. An output can violate a lower-ranked constraint while satisfying a more important one; the selected candidate is optimal relative to the ranking, not necessarily free of violations. (ecampusontario.pressbooks.pub)
Representational approaches also differ. Autosegmental phonology allows properties such as tone to be represented separately from the segments with which they associate, providing alternatives to strictly linear representations. Empirical research combines analysis of linguistic distributions with recordings, articulatory measurements, and perception experiments. These methods examine both abstract patterns and their physical realization. (linguistics.berkeley.edu)
Signed-language phonology investigates handshape, location, movement, orientation, and their structural combinations. Its inclusion makes phonology a study of linguistic form rather than exclusively of audible sound. Differences between signed and spoken modalities also raise questions about which units and processes are shared and which require modality-specific analysis. Research on language acquisition examines how learners develop sensitivity to such language-specific distinctions and patterns. (ecampusontario.pressbooks.pub)