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Dyslexia, also known as reading disorder, is characterized by trouble with reading despite normal intelligence. Different people are affected to different degrees. Problems may include difficulties in spelling words, reading quickly, writing words, "sounding out" words in the head, pronouncing words when reading aloud and understanding what one reads. Often these difficulties are first noticed at school. When someone who previously could read loses their ability, it is known as "alexia". The difficulties are involuntary and people with this disorder have a normal desire to learn. People with dyslexia have higher rates of attention deficit hyperactivity disorder (ADHD), developmental language disorders, and difficulties with numbers.
Mixed receptive-expressive language disorder is a communication disorder in which both the receptive and expressive areas of communication may be affected in any degree, from mild to severe. Children with this disorder have difficulty understanding words and sentences. This impairment is classified by deficiencies in expressive and receptive language development that is not attributed to sensory deficits, nonverbal intellectual deficits, a neurological condition, environmental deprivation or psychiatric impairments. Research illustrates that 2% to 4% of five year olds have mixed receptive-expressive language disorder. This distinction is made when children have issues in expressive language skills, the production of language, and when children also have issues in receptive language skills, the understanding of language. Those with mixed receptive-language disorder have a normal left-right anatomical asymmetry of the planum temporale and parietale. This is attributed to a reduced left hemisphere functional specialization for language. Taken from a measure of cerebral blood flow (SPECT) in phonemic discrimination tasks, children with mixed receptive-expressive language disorder do not exhibit the expected predominant left hemisphere activation. Mixed receptive-expressive language disorder is also known as receptive-expressive language impairment (RELI) or receptive language disorder.
Reading for special needs has become an area of interest as the understanding of reading has improved. Teaching children with special needs how to read was not historically pursued due to perspectives of a Reading Readiness model. This model assumes that a reader must learn to read in a hierarchical manner such that one skill must be mastered before learning the next skill. This approach often led to teaching sub-skills of reading in a decontextualized manner. This style of teaching made it difficult for children to master these early skills, and as a result, did not advance to more advanced literacy instruction and often continued to receive age-inappropriate instruction.
Phonological awareness is an individual's awareness of the phonological structure, or sound structure, of words. Phonological awareness is an important and reliable predictor of later reading ability and has, therefore, been the focus of much research.
Specific language impairment (SLI) is diagnosed when a child's language does not develop normally and the difficulties cannot be accounted for by generally slow development, physical abnormality of the speech apparatus, autism spectrum disorder, apraxia, acquired brain damage or hearing loss. Twin studies have shown that it is under genetic influence. Although language impairment can result from a single-gene mutation, this is unusual. More commonly SLI results from the combined influence of multiple genetic variants, each of which is found in the general population, as well as environmental influences.
Language development in humans is a process starting early in life. Infants start without knowing a language, yet by 10 months, babies can distinguish speech sounds and engage in babbling. Some research has shown that the earliest learning begins in utero when the fetus starts to recognize the sounds and speech patterns of its mother's voice and differentiate them from other sounds after birth.
Metalinguistics is the branch of linguistics that studies language and its relationship to other cultural behaviors. It is the study of dialogue relationships between units of speech communication as manifestations and enactments of co-existence. Jacob L. Mey in his book, Trends in Linguistics, describes Mikhail Bakhtin's interpretation of metalinguistics as "encompassing the life history of a speech community, with an orientation toward a study of large events in the speech life of people and embody changes in various cultures and ages."
Language disorders or language impairments are disorders that involve the processing of linguistic information. Problems that may be experienced can involve grammar, semantics (meaning), or other aspects of language. These problems may be receptive, expressive, 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.
Speech-language pathology is a field of expertise practiced by a clinician known as a speech-language pathologist (SLP) or a speech and language therapist, both of whom may be known by the shortened description, speech therapist. SLP is considered a "related health profession" or "allied health profession" along with audiology, optometry, occupational therapy, rehabilitation psychology, physical therapy, behavior analysis and others.
Auditory processing disorder (APD), rarely known as King-Kopetzky syndrome or auditory disability with normal hearing (ADN), is an umbrella term for a variety of disorders that affect the way the brain processes auditory information. Individuals with APD usually have normal structure and function of the outer, middle, and inner ear. However, they cannot process the information they hear in the same way as others do, which leads to difficulties in recognizing and interpreting sounds, especially the sounds composing speech. It is thought that these difficulties arise from dysfunction in the central nervous system.
Language-based learning disabilities or LBLD are "heterogeneous" neurological differences that can affect skills such as listening, reasoning, speaking, reading, writing, and math calculations. It is also associated with movement, coordination, and direct attention. LBLD is not usually identified until the child reaches school age. Most people with this disability find it hard to communicate, to express ideas efficiently and what they say may be ambiguous and hard to understand It is a neurological difference. It is often hereditary, and is frequently associated to specific language problems.
Speech and language impairment are basic categories that might be drawn in issues of communication involve hearing, speech, language, and fluency.
Developmental verbal dyspraxia (DVD), also known as childhood apraxia of speech (CAS) and developmental apraxia of speech (DAS), is a condition in which children have problems saying sounds, syllables and words. This is not because of muscle weakness or paralysis. The brain has problems planning to move the body parts needed for speech. The child knows what they want to say, but their brain has difficulty coordinating the muscle movements necessary to say those words.
A late talker is a toddler experiencing late language emergence (LLE). LLE can also be an early or secondary sign of an autism spectrum disorder, or other developmental disorders, such as attention deficit hyperactivity disorder, intellectual disability, learning disability, social communication disorder, or specific language impairment. Late talkers are children who are intellectually abled, but do not show signs of normal language development for their age. Lack of language development, comprehension skills and challenges with literacy skills are potential risks as late talkers age. Outlook for late talkers with or without intervention is generally favorable. Toddlers have a high probability of catching up to typical toddlers if early language interventions are put in place. Language interventions include general language stimulation, focused language stimulation and milieu teaching.
Developmental language disorder (DLD) is identified when a child has problems with language development that continue into school age and beyond. The language problems have a significant impact on everyday social interactions or educational progress, and occur in the absence of autism spectrum disorder, intellectual disability or a known biomedical condition. The most obvious problems are difficulties in using words and sentences to express meanings, but for many children, understanding of language is also a challenge, although this may not be evident unless the child is given a formal assessment.
Susan Ellis Weismer is a language and communication scientist known for her work on language development in children with specific language impairment and autism spectrum disorder (ASD). She is the Oros Family Chair and Professor of Communication Sciences and Disorders at the University of Wisconsin–Madison, where she is a Principal Investigator and Director of the Language Processes Lab. She has also served as the Associate Dean for Research, College of Letters and Sciences at the University of Wisconsin–Madison.
Marilyn Nippold is language and communications scientist with expertise in adolescent language development and disorders. She is Professor in Communication Disorders and Sciences at the University of Oregon. Nippold is author of several books on adolescent language development, including Later Language Development: The School-age and Adolescent Years and Language Sampling with Adolescents: Implications for Intervention.
Kate Nation is an experimental psychologist and expert on language and literacy development in school age children. She is Professor of Experimental Psychology and Fellow of St. John's College of the University of Oxford, where she directs the ReadOxford project and the Language and Cognitive Development Research Group.
Laura M. Justice is a language scientist and expert on interventions to promote children's literacy. She is the EHE Distinguished Professor of Educational Psychology at Ohio State University, where she also serves as the Executive Director of the A. Sophie Rogers School for Early Learning.
Elena Margaret Plante is a researcher and speech-language pathologist specializing in developmental language disorders in children and adults. She holds the position of Professor and Head of the Department of Speech, Language, and Hearing Sciences (SLHS) at the University of Arizona (UA) and is the principal investigator at the eponymous Plante Laboratory at UA. Plante is also affiliated with the Cognitive Science program at UA.
References
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