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Stuttering, also known as stammering, is a speech disorder characterized externally by involuntary repetitions and prolongations of sounds, syllables, words, or phrases as well as involuntary silent pauses called blocks in which the person who stutters is unable to produce sounds.
The dopamine hypothesis of stuttering attributes to the phenomenon of stuttering a hyperactive and disturbed dopaminergic signal transduction in the brain. The theory is derived from observations in medical neuroimaging and from the empirical response of some antipsychotics and their antagonistic effects on the dopamine receptor.
In some cases the cause is unknown. However, there are various known causes of speech impairments, such as hearing loss, neurological disorders, brain injury, an increase in mental strain, constant bullying, intellectual disability, substance use disorder, physical impairments such as cleft lip and palate, and vocal abuse or misuse. [12]
Stuttering is a disruption in the fluency of an individual's speech, which begins in childhood and may persist over a lifetime. Stuttering is a form of disfluency; Disfluencies may be due to unwanted repetitions of sounds, or extension of speech sounds, syllables, or words. Disfluencies also incorporate unintentional pauses in speech, in which ...
Palilalia must be differentiated from other complex tic disorders (such as echolalia), stuttering, [10] and logoclonia. In contrast to stuttering or logoclonia, palilalic repetitions tend to consist of complete sections of words or phrases, [ 5 ] are often repeated many times, [ 11 ] and the speaker has no difficulty initiating speech.
Speech symptoms including dysphonia (whispering speech), slurred or stuttering speech; Sensory disturbance including hemisensory syndrome (altered sensation down one side of the body) Numbness or inability to sense touch; Dizziness and balance problems; Pain (including chronic migraines) Extreme slowness and fatigue
Thought blocking is a neuropsychological symptom expressing a sudden and involuntary silence within a speech, and eventually an abrupt switch to another topic. [1] Persons undergoing thought blocking may utter incomprehensible speech; they may also repeat words involuntarily or make up new words.
These can result in dysfunction, or failure of: the motor or somatosensory cortex of the brain, corticobulbar pathways, the cerebellum, basal nuclei (consisting of the putamen, globus pallidus, caudate nucleus, substantia nigra etc.), brainstem (from which the cranial nerves originate), or the neuromuscular junction (in diseases such as ...