Muteness

Those who are physically mute may have problems with the parts of the human body required for human speech (vocal cords, lungs, trachea, esophagus, mouth, or tongue, etc.).

Trauma or injury to Broca's area, located in the left inferior frontal cortex of the brain, can cause muteness.[1]

Selective mutism previously known as "elective mutism" is an anxiety disorder very common among young children, characterized by the inability to speak in certain situations. It should not be confused with someone who is mute and cannot communicate due to physical disabilities. Selectively mute children are able to communicate in situations in which they feel comfortable. About 90% of children with this disorder have also been diagnosed with social anxiety. It is very common for symptoms to occur before the age of five and do not have a set time period. Not all children express the same symptoms. Some may stand motionless and freeze in specific social settings and have no communication.[2]

Alalia is a disorder that refers to a delay in the development of speaking abilities in children. In severe cases, some children never learn how to speak. It can be caused by illness of the child, illness in utero, mutism of the parents or guardians, the general disorders of the muscles, the shyness of the child, and certain genetic disorders, among other causes.[3]

Anarthria is a severe form of dysarthria. The coordination of movements of the mouth and tongue or the conscious coordination of the lungs are damaged.[4]

Aphasia can rob all aspects of the speech and language.[5] It is a damage of the cerebral centres of the language.

Aphonia is the inability to produce any voice. In severe cases the patient loses phonation. It is caused by the injury, paralysis, and illness of the larynx.[3]

Conversion disorder can cause loss of speaking ability.[6]

Feral children grow up outside of human society, and so usually struggle in learning any language.[7]

Some people with autism never learn to speak.[3]

Most intellectually disabled children learn to speak, but in the severe cases they cannot learn speech (IQ 20-25).[7][8] Children with Down syndrome often have impaired language and speech.[7][8]

Hearing mutism is an obsolete term used in the late nineteenth and early twentieth century for specific language impairment.[9]

Akinetic mutism is a state in which the individual is unable to speak or move.[10]

Some mute patients have adapted to their disability by using machines that vibrate their vocal cords, allowing them to speak. Esophageal speech can give some speaking ability.[11] Others learn sign language to communicate.[12]

Computers also facilitate communication, both with smart phones and the Internet. Many augmentative and alternative communication devices exist to allow people to communicate; these include "text-to-speech" devices and/or software programs, which turns typed text and/or a button loaded with messages into electronic vocalizations, enabling the mute and the speech-impaired to "speak".

Other techniques of the augmentative and alternative communication include:

• written notes
• helper pages, books with letters, words, iconic and Bliss symbols and pictures[13] and their tangible versions[14][15][16][17]
• lip-reading by the communication partner
• vocalization
• speech recording and replaying
• alternative pointers[4]

• Aphasia
• Aphonia
• Augmentative and alternative communication
• Autism
• Deafness
• Developmental disability
• Dysarthria
• Dyslalia
• Speech delay
• Vocal cord paresis