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Disorders that involve the processing of linguistic information

Language disorders or language impairments are disorders that involve the processing of linguistic information. Problems that may be experienced can involve grammar (syntax and/or morphology), semantics (meaning), or other aspects of language. These problems may be receptive (involving impaired language comprehension), expressive (involving language production), or a combination of both. Examples include specific language impairment, better defined as developmental language disorder, or DLD, and aphasia, among others. Language disorders can affect both spoken and written language, and can also affect sign language; typically, all forms of language will be impaired. Current data indicates that 7% of young children display language disorder, with boys being diagnosed twice as often as girls. Preliminary research on potential risk factors have suggested biological components, such as low birth weight, prematurity, general birth complications, and male gender, as well as family history and low parental education can increase the chance of developing language disorders. For children with phonological and expressive language difficulties, there is evidence supporting speech and language therapy. However, the same therapy is shown to be much less effective for receptive language difficulties. These results are consistent with the poorer prognosis for receptive language impairments that are generally accompanied with problems in reading comprehension. Note that these are distinct from speech disorders, which involve difficulty with the act of speech production, but not with language. Language disorders tend to manifest in two different ways: receptive language disorders (where one cannot properly comprehend language) and expressive language disorders (where one cannot properly communicate their intended message).

Receptive language disorders can be acquired—as in the case of receptive aphasia, or developmental (most often the latter). When developmental, difficulties in spoken language tend to occur before three years of age. Usually such disorders are accompanied by expressive language disorders. However, unique symptoms and signs of a receptive language disorder include: struggling to understand meanings of words and sentences, struggling to put words in proper order, and inability to follow verbal instruction. Treatment options include: language therapy, special education classes for children at school, and a psychologist if accompanying behavioral problems are present.

Expressive aphasia is characterized by partial loss of the ability to produce language, although comprehension generally remains intact; it is typically a result of stroke, trauma, or tumors. Other expressive language disorders may impair not only voice and articulation, but also the mental formation of language, itself. Expressive language disorders can occur during a child's development or they can be acquired. This acquisition usually follows a normal neurological development and is brought about by a number of causes such as head trauma or irradiation. Features of an expressive language disorder vary, but have certain features in common such as: limited vocabulary, inability to produce complex grammar, and more lexical errors. If it is a developmental disorder, the child will have difficulty acquiring new words and grammatical structures. The child will often begin speaking later than his/her peers and progress at a slower rate linguistically. Due to the very nature of these disorders, the child may struggle with academics and socializing with peers. Experts that commonly treat such disorders include speech pathologists and audiologists.

A special class of language disorders is studied by the psychopathology of language. Its topics of interest range from simple speech error to dream speech and schizophasia.

During childhood the most common type of disruption in communication is a language disorder. In most cases, language development is predicable and referrals for evaluation may be needed in cases where a child's language development is atypical. Language disorders among children are present when a child is experiencing substantial difficulty regarding their language development.

Specific language impairment (SLI) is a developmental language disorder among children that has no known cause and cannot be attributed to any physical or intellectual disability, environmental factors such as deprivation, hearing loss, or any other underlying etiology. SLI is characterized by abnormal development of language that includes a delay in the onset of language, simplification of grammatical structures and difficulty with grammatical morphology, Children with SLI tend to begin speaking at a later age and have a smaller vocabulary than their peers. The type of language dysfunction that occurs is dependent upon the site, extent, and cause of the brain damage. All areas of language are affected by aphasia including expressive and receptive language abilities. Global aphasia is a type of aphasia that occurs in people where a large portion of the language center of the brain has been damaged and results in deficits in all modalities of language. Broca's aphasia may affect an individual's ability to produce speech while comprehension remains intact. TBI is categorized as either mild, moderate or severe

In order to help distinguish between language disorders, they are often categorized as either primary disorders of language, secondary disorders of language, acquired or developmental. A primary language disorder is one that cannot be attributed to an underlying disorder and is solely responsible for the language disturbance while a secondary language disorder is the result of another disorder. Language disorders can also be categorized as developmental or acquired. A developmental language disorder is present at birth while an acquired language disorder occurs at some point after birth. Acquired language disorders can often be attributed to injuries within the brain due to occurrences such as stroke or Traumatic brain injury.