A speech disorder in which the flow of speech is disrupted by involuntary repetitions and prolongations of sounds, syllables, words or phrases, and by involuntary silent pauses or blocks in which the stutterer is unable to produce sounds.
For stuttering and other fluency disorders, a popular treatment method is fluency training, which develops coordination between speech and breathing, slows down the rate of speech, and develops the ability to prolong syllables.
Language disorders include stuttering; articulation disorders, such as substituting one sound for another (tandy for candy); omitting a sound (canny for candy); or distorting a sound (shlip for slip).
As of the early 2000s no answers had been found to explain the causes of stuttering; still, much has been learned about what contributes to stuttering's development and how to prevent it in children.
Stuttering usually begins in childhood when the child is developing language skills, and it rarely develops in adulthood with only 1 percent of the population affected by the disorder.
However, there is some evidence that left-handed people may be more at risk for schizophrenia, bipolar disorder, or language-processing disorders, including dyslexia and stuttering.