Anti-social behaviour

Anti-social behaviours, sometimes called dissocial behaviours, are actions which are considered to violate the rights of or otherwise harm others by committing crime or nuisance, such as stealing and physical attack or noncriminal behaviours such as lying and manipulation. It is considered to be disruptive to others in society. This can be carried out in various ways, which includes, but is not limited to, intentional aggression, as well as covert and overt hostility. Anti-social behaviour also develops through social interaction within the family and community. It continuously affects a child's temperament, cognitive ability and their involvement with negative peers, dramatically affecting children's cooperative problem-solving skills. Many people also label behaviour which is deemed contrary to prevailing norms for social conduct as anti-social behaviour. However, researchers have stated that it is a difficult term to define, particularly in the United Kingdom where many acts fall into its category. The term is especially used in Irish English and British English.

Although the term is fairly new to the common lexicon, the word anti-social behaviour has been used for many years in the psychosocial world where it was defined as "unwanted behaviour as the result of personality disorder." For example, David Farrington, a British criminologist and forensic psychologist, stated that teenagers can exhibit anti-social behaviour by engaging in various amounts of wrongdoings such as stealing, vandalism, sexual promiscuity, excessive smoking, heavy drinking, confrontations with parents, and gambling. In children, conduct disorders could result from ineffective parenting. Anti-social behaviour is typically associated with other behavioural and developmental issues such as hyperactivity, depression, learning disabilities, and impulsivity. Alongside these issues one can be predisposed or more inclined to develop such behaviour due to one's genetics, neurobiological and environmental stressors in the prenatal stage of one's life, through the early childhood years.

The American Psychiatric Association, in its Diagnostic and Statistical Manual of Mental Disorders, diagnoses persistent anti-social behaviour starting from a young age as antisocial personality disorder. Genetic factors include abnormalities in the prefrontal cortex of the brain while neurobiological risk include maternal drug use during pregnancy, birth complications, low birth weight, prenatal brain damage, traumatic head injury, and chronic illness. The World Health Organization includes it in the International Classification of Diseases as dissocial personality disorder. A pattern of persistent anti-social behaviours can also be present in children and adolescents diagnosed with conduct problems, including conduct disorder or oppositional defiant disorder under the DSM-5. It has been suggested that individuals with intellectual disabilities have higher tendencies to display anti-social behaviours, but this may be related to social deprivation and mental health problems. More research is required on this topic.

Intent and discrimination may determine both pro-social and anti-social behaviour. Infants may act in seemingly anti-social ways and yet be generally accepted as too young to know the difference before the age of four or five. Berger states that parents should teach their children that "emotions need to be regulated, not depressed". One problem with the assumption that a behaviour that is "simply ignorant" in infants would have antisocial causes in persons older than four or five years at the same time as the latter are supposed to have more complex brains (and with it a more advanced consciousness) is that it presumes that what appears to be the same behaviour would have fewer possible causes in a more complex brain than in a less complex brain, which is criticized because a more complex brain increases the number of possible causes of what looks like the same behaviour as opposed to decreasing it.

Studies have shown that in children between ages 13–14 who bully or show aggressive behaviour towards others exhibit anti-social behaviours in their early adulthood. There are strong statistical relationships that show this significant association between childhood aggressiveness and anti-social behaviours. Analyses saw that 20% of these children who exhibit anti-social behaviours at later ages had court appearances and police contact as a result of their behaviour.

Many of the studies regarding the media's influence on anti-social behaviour have been deemed inconclusive. Some reviews have found strong correlations between aggression and the viewing of violent media, while others find little evidence to support their case. The only unanimously accepted truth regarding anti-social behaviour is that parental guidance carries an undoubtedly strong influence; providing children with brief negative evaluations of violent characters helps to reduce violent effects in the individual.

Families greatly impact the causation of anti-social behaviour. Some other familial causes are parent history of anti-social behaviours, parental alcohol and drug abuse, unstable home life, absence of good parenting, physical abuse, parental instability (mental health issues/PTSD) and economic distress within the family.

Studies have found that there is a link between antisocial behaviour and increased amygdala activity specifically centered around facial expressions that are based in anger. This research focuses on the fact that the symptom of over reactivity to perceived threats that comes with antisocial behaviour may be from this increase in amygdala activity. This focus on perceived threat does not include emotions centered around distress.