<unk>  is considered an aphasia, a disorder of language, and is not to be confused with speech disorders, as there is no difficulty in the formation of internal speech.<unk>  is similar to speech disorders such as stuttering or cluttering, as it tends to express itself only in spontaneous speech, such as answering basic questions, and not in automatic speech such as reading or singing; however, it distinctively affects words and phrases rather than syllables and sounds.<unk>  may occur in conditions affecting the pre-frontal cortex or basal ganglia regions, either from physical trauma, neurodegenerative disorders, genetic disorders, or a loss of dopamine in these brain regions.<unk>  occurs most commonly in Tourette syndrome and may be present in neurodegenerative disorders like Alzheimer's disease and progressive supranuclear palsy.
Palilalia
Echolalia
Tachylalia
Coprolalia
Tourettism
Selective mutism
Akinetic mutism
Taurodontism