Grouping is a method that can be applied to any experiments and studies. Mixing similar and opposite variables always produces mixed results. In this investigation subjects were grouped together according to the severity of their lisp. The reason of the study was to compare and contrast the relationship among frontal lisping, protrusive lingual force, and lingual diadochokinetic rates. The results of the investigation showed that when comparing the subjects with the lisp to normal speakers, the lispers in each group had weaker protrusive lingual forces and this increased as did severity and all groups except for the moderately severe lispers had slower lingual diadochokinetic rates. In conclusion it seems that grouping the lispers by the severity of their lisp before examining their misarticulations may offer vital information about the diagnosis, treatment, and prognosis of their speech issues.
http://libproxy.uncg.edu:2079/pubmed/7354629
http://libproxy.uncg.edu:2079/pubmed/17223125
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