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Communication deviance (CD) occurs when a speaker fails to effectively communicate meaning to their listener with confusing speech patterns or illogical patterns. These disturbances can range from vague linguistic references, contradictory statements to more encompassing non-verbal problems at the level of turn-taking.

The term was originally introduced by Lyman Wynne and Margaret Singer in 1963 to describe a communication style found among parents who had children with schizophrenia. According to Wynne, people are able to focus their attention and identify meaning from external stimuli beginning with their interactions, particularly with their parents, during their early years of life. In family communication, deviance is present in the way members acknowledge or affirm one another as well as in task performance.

A recent meta-analysis reported that communication deviance is highly prevalent in parents of patients diagnosed with schizophrenia  and adoption studies have reported significant associations between CD in the parent and thought disorder in the offspring.

But, some research shows that CD may be more likely to be associated with specific cognitive disorganization rather than the criteria of schizophrenia, like DSM-III or DSM-II. Also, the second point of findings of CD shows that CD may be associated with children's disorders too, rather than the behavior of preschizophrenic types.

For application purposes: CD has been thought of as a measurement of disorder shown in speech in the subclinical aspect.

However, the mechanisms by which CD impacts on the offspring's cognition are still unknown. Some researchers theorize that, in the case of a high degree of egocentric communication in parents where the sender and the receiver do not speak and listen according to each other's premises, the child develops uncertainty.

The research of psychiatrists and psychoanalysts Lyman Wynne and Theodore Lidz on communication deviance and roles (e.g., pseudo-mutuality, pseudo-hostility, schism and skew) in families of people with schizophrenia also became influential with systems-communications-oriented theorists and therapists.

For individual
as people got CD, It is difficult for people to follow and make consistent sharing of attention and meaning. Also, the content which patients said may confuse the listener and inhibit to build of a shared focus of attention. For the stability of CD, the stability will change followed by age. Some research shows that young people with CD were not correlated with the follow-up CD, but people at a mean age of 32 have a high correlation with follow-up CD.

For family
Some research has shown that when communicating with patients with CD, patients' parents will use similar odd terms and fail to express a sense of closure in their thought even when they talk to their parents. To be more specific, for children with externalizing, “acting out” or “preschizophrenic” behaviors, parental CD will be higher in maternal and paternal CD was found to be more significant only in which children with high externalizing behaviors .To be more specific, data analysis shows that a large magnitude(g = .97) is linked between maternal CD and offspring psychotic disorder.

Genetic
CD is associated with genetics, which is a genetic vulnerability for schizophrenia. Studies show that CD is associated with schizophrenia spectrum disorders history in the family, among their parents and siblings.

Children’s level of CD will link to the way of communication between parents. The parents who both have a pathologic affective style of communication will lead a high level of CD in their children. If the parents have a healthier style of communication, the levels of CD in their children will be lower.

But studies of the high level of parental CD are mostly based on English-speaking countries and white subjects. So the findings lack generalisability.

Individual difference
If compared to non-offenders, juvenile offenders experience more CD and/or inconsistent control in families. The most common explanation is adolescents can not get sympathetic feedback from their parents, so they are more likely to turn to other sources to comfort themselves like sex or crime.

Environment
In the cultural aspect, CD was more common in intercultural encounters, especially when there were discrepancies in communication styles and norms, the misunderstanding can lead to CD.

In the social aspect, children with self-isolation or lack of social support have more opportunities to get communication deviance, because they lack communication practice and have communication difficulties. So, some researchers have suggested that more social support can help children reduce their communication difficulties and reduce the level of CD.

Diagnose
There are two approaches to putting preventions of CD. The first is the 'clinical high risk' approach. It puts a premium on early treatment, the ultimate goal of this approach is prevention. The second one is secondary and tertiary prevention, this approach can reflect the need for intervention focusing on the whole family. Also, some studies point out that when considering the prevention of CD, the relationship between family and their children should be taken into account.

The psychology treatment
the psychology treatment can be divided into four main elements :


 * 1) Holding seminars for parents which give them instructions on schizophrenia and how to treat a schizophrenic child.
 * 2) Problem-solving session.
 * 3) Milieu therapy: to create an 'emotional climate' environment by a depressed emotion for patients.
 * 4) Establishing a good social network for patients.

The family treatment
The family treatment mainly includes education, communication and problem-solving techniques. Study shows that family treatment will have a more effective improvement than individual treatment.

Cost
In comparison to control subjects or patients with other non-psychotic disturbances, parents of schizophrenic patients have substantially higher CD levels. Maternal CD was found to be higher than Patrilineal CD. Also, Paternal CD was found to be higher level in families which their children were with higher externalizing behaviors.

measurement of CD
CD levels can be measured by Thematic Apperception Test (TAT) and Rorschach test.