Phonemes are the basic unit of speech. They are the simplest speech sounds that are used to differentiate between one word and another. A phoneme is capable of creating distinctions in meaning between words.
There are many stuttering problems for people who stutter. People with an established stutter are aware of the negative effect of repetitions, prolongations, hesitations and blocks on their speech. Their stutter (stammer) may be accompanied by facial tics and uncontrolled body movements. Stuttering can lead to the avoidance of certain activities and to social isolation.