Editing Fortis and lenis (section)

== History ==
Originally, the terms were used to refer to an impressionistic sense of strength differences, though more sophisticated instruments eventually gave the opportunity to search for the acoustic and articulatory signs.  For example, {{Harvcoltxt|Malécot|1968}} tested whether articulatory strength could be detected by measuring the force of the contact between the [[Manner of articulation|articulators]] or of the peak pressure in the mouth.  Because such studies initially found little to substantiate the terminology, phoneticians have largely ceased using them, though they are still commonly used as "phonological labels for specifying a dichotomy when used language-specifically."<ref>{{Harvcoltxt|Ladefoged|Maddieson|1996|pp=95, 98}}, citing {{Harvcoltxt|Catford|1977}}, {{Harvcoltxt|Jaeger|1983}}, and {{Harvcoltxt|Elugbe|1980}} as examples.</ref>  This can be useful when the actual articulatory features underlying the distinction are unknown, under-researched or irrelevant.