In linguistics (articulatory phonetics), manner of articulation describes how the tongue, lips, jaw, and other speech organs are involved in making a sound make contact. Often the concept is only used for the production of consonants. For any place of articulation, there may be several manners, and therefore several homorganic consonants.
One parameter of manner is stricture, that is, how closely the speech organs approach one another. Parameters other than stricture are those involved in the r-like sounds (taps and trills), and the sibilancy of fricatives. Often nasality and laterality are included in manner, but phoneticians such as Peter Ladefoged consider them to be independent.
From greatest to least stricture, speech sounds may be classified along a cline as stop consonants (with occlusion, or blocked airflow), fricative consonants (with partially blocked and therefore strongly turbulent airflow), approximants (with only slight turbulence), and vowels (with full unimpeded airflow). Affricates often behave as if they were intermediate between stops and fricatives, but phonetically they are sequences of stop plus fricative.
Historically, sounds may move along this cline toward less stricture in a process called lenition. The reverse process is fortition.
Sibilants are distinguished from other fricatives by the shape of the tongue and how the airflow is directed over the teeth. Fricatives at coronal places of articulation may be sibilant or non-sibilant, sibilants being the more common.
Taps and flaps are similar to very brief stops. However, their articulation and behavior is distinct enough to be considered a separate manner, rather than just length.
Trills involve the vibration of one of the speech organs. Since trilling is a separate parameter from stricture, the two may be combined. Increasing the stricture of a typical trill results in a trilled fricative. Trilled affricates are also known.
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