There is no single cause of stuttering to date. Many
researchers have come out with varied results—some psychological basis and
others neurological causes. There is another field that says stuttering is a
homogenous disorder but this is yet to be disputed. It says that stutterers
suffer from one underlying problem. Nevertheless, popular theories are based on
heterogeneity of the disorder.
One theorist has argued that since there no measurement and
causes of fluency, it is harder to define the causes of abnormality. For a long
time, theorists believed that the concept of stuttering was an outgrowth or
exacerbation of normal disfuency. Yet, these premises and models are still
subjected to further experiments and studies.
To further aid in the study of stuttering, theorists tried
to categorize and make a sub-group of people who stutters. First is the
severity as a grouping variable. Many studies used this sub-grouping with so
far mixed results of analyses. Meanwhile, the intriguing sub-grouping of Van
Riper described four tracks in the development of shuttering.
The model of fluent speech production presents two important
points in understanding the categories of stuttering. First, stuttering shows a
failure in temporal processing. Second, stuttering shows an imbalance between
the capacities of the fluency generating system and demands of the environment.
Following the model of fluent speech production,
hypothetical types or sub groups in stuttering are formulated. First, the
speech motor control sub-groups which have two distinct groups called dyspraxic
stuttering and respiratory control stuttering.
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