The phonological hierarchy describes a series of increasingly smaller regions of a phonological utterance, each nested within the next highest region. Different research traditions make use of slightly different hierarchies. For instance, there is one hierarchy which is primarily used in theoretical phonology, while a similar hierarchy is used in discourse analysis. Both are described in the sections below.
Theoretical phonological hierarchy
Listed in order from highest to lowest are the categories of the hierarchy that is most commonly used in theoretical phonology. There is some disagreement on the arrangement and inclusion of units, especially those that reside higher in the hierarchy. For example, the clitic group is not considered to be a separate level in Selkirk's version of the hierarchy, while the minor phrase or accentual phrase are not considered to be separate from the phonological phrase in Hayes' and Nespor & Vogel's hierarchies.
- Utterance (U)
- Intonational phrase (I-phrase) (ι) also known as:
- Phonological phrase (P-phrase), also known as:
- Accentual phrase, also known as:
- Clitic group
- Phonological word (P-word, ω), sometimes also called the prosodic word
- Foot (F, φ)
- Syllable (σ)
- Mora (μ)
- Segment (phoneme)
The hierarchy from the mora upwards is technically known as the prosodic hierarchy.
Discourse analytical hierarchy
The phonological hierarchy as it is defined in the discourse analytical tradition is listed below.
- Selkirk, E. O. (1996). Martin, J.; Demuth, K. (eds.). "The prosodic structure of function words". International Conference on Bootstrapping from Speech to Grammar in Early Acquisition. Hillsdale, NJ: Lawrence Erlbaum.
- Hayes, Bruce (1989). Kiparsky, P.; Youmans, G. (eds.). "The prosodic hierarchy in meter". Phonetics and Phonology Vol. 1: Rhythm and Meter. San Diego: Academic Press: 201–260.
- Nespor, M.; Vogel, I. (1986). Prosodic Phonology. Dordrecht: Foris Publications.
- Shattuck-Hufnagel, Stephanie; Turk, Alice (1996). "A Prosody Tutorial for Investigators of Auditory Sentence Processing". Journal of Psycholinguistic Research. 25 (2): 193–247.
- Pierrehumbert, J.; Beckman, M. B. (1988). Japanese Tone Structure. Cambridge, MA: MIT Press.