For example, in Moroccan Arabic, pharyngeals tend to lower neighboring vowels (corresponding to the formant 1).
)[citation needed] For transcribing disordered speech, the extIPA provides symbols for upper-pharyngeal stops, ⟨ꞯ⟩ and ⟨𝼂⟩.
Esling (2010) thus restores a unitary pharyngeal place of articulation, with the consonants being described by the IPA as epiglottal fricatives differing from pharyngeal fricatives in their manner of articulation rather than in their place: The so-called "Epiglottal fricatives" are represented [here] as pharyngeal trills, [ʜ ʢ], since the place of articulation is identical to [ħ ʕ], but trilling of the aryepiglottic folds is more likely to occur in tighter settings of the laryngeal constrictor or with more forceful airflow.
[7] Pharyngeal or epiglottal stops and trills are usually produced by contracting the aryepiglottic folds of the larynx against the epiglottis.
The IPA does not have diacritics to distinguish this articulation from standard aryepiglottals; Edmondson et al. use the ad hoc, somewhat misleading, transcriptions ⟨ʕ͡ʡ⟩ and ⟨ʜ͡ħ⟩.
Although upper-pharyngeal plosives are not found in the world's languages, apart from the rear closure of some click consonants, they occur in disordered speech.