- Causes of autism: the question unanswered
- The internal processes of the body
Many parents want to understand what they have done so (or not done), what was the cause of autism in their children. And though sometimes the cause of the disease can be found, often the question remains unanswered so on. Except the presence of rare genetic diseases and cases of exposure to toxins that cause autism (or symptoms that resemble the symptoms of autism and often lead to an incorrect diagnosis), the disease is usually considered to be idiopathic, meaning that its causes are unknown.
Psychology and Genetics
In the mid-1990s, it was thought that autism - a consequence of a lack of parental care and the lack of psychological intimacy with the mother.
Dr. Bernard Rimlend in his book "Infantile Autism: Kanner's syndrome and its implications for the theory of neural behavior" questioned this belief.
It is now known that the cause of the disease susceptible defeat lying areas of the brain before birth, during birth or in the first few weeks after birth. At the same time there are neurological abnormalities, which cause disruption of the developing brain, and as a consequence, autism. In particular, there is a violation of the process of myelination. Neurons are not protected by a special layer of myelin, can not properly transmit signals.
The severity of symptoms of autism depends on the level of exposure and the extent of damage.
Often the changes that have occurred in patients who can be seen during the autopsy, as well as with the help of an electroencephalogram (EEG) and magnetic resonance imaging (MRI). But these changes in different individuals may have different character. Thus, agents that would explain the development of autism in all cases does not yet exist.
Complications during pregnancy, during labor and delivery can cause a number of disorders of the brain, which lead not only to the development of autism, but also to the emergence of many other neurological disorders.
There is a link between genetics and human predisposition to autism. Not yet discovered a gene or set of genes that would be responsible for a predisposition to autism in general. But it is known that gene defects MDCP2 X chromosome lead to the development of one of the types of autism called "Rett syndrome."
Recent studies have confirmed the fact that some people have a predisposition to autism. In families where a child is already suffering from the disease, the risk of having another child with autism is about 5%, or one chance in 20. This is a higher risk than the general population.
Scientists are looking for the relationship that exists between genes and increased susceptibility to disease. In some cases, parents and other relatives of children suffering from autism are minor violations of social communication skills or have a tendency to pathological cyclical action. In addition, there are facts which show that in families where there are sick autism more often than usual, there are emotional disorders, such as manic-depressive psychosis
Manic-depressive illness - which phases are the most dangerous?
The theory that the cause of autism is wrong or insufficient parental care, has been refuted.
Some studies suggest that people with autism, the level of serotonin and other neurotransmitters in the brain beyond the norm. These abnormalities may indicate that autism may result from disorders of brain development is still at an early stage of its formation. The reason for such violations are defects in genes that control the development of the brain and regulate the exchange of information between neurons. These interesting data are preliminary and require further study.
In autism may also affect the environmental factors, such as toxins, infection, vaccinations.
In today's world is inevitable interaction with various poisons and toxins. At certain critical stages of this interaction leads to a malformation of the brain.
It is known that infections such as cytomegalovirus
Cytomegalovirus - what is its danger?
, Rubella and herpes simplex virus
Herpes simplex - in fact, not so simple
May lead to brain damage. Congenital Lyme disease also provokes the development of autism. The source of the disease may be some other infectious agents.
There is debate about whether the mercury, thimerosal or various additives to vaccines, such as aluminum or foreign proteins and organisms, be the cause of autism. Mercury - a very dangerous heavy metal and everything known about its toxicity.
Despite the fact that this thread is still debate, researchers reject the theory that the vaccine or the ingredients can cause autism. Five major epidemiological studies conducted in the US, the UK, Sweden and Denmark, have shown that the level of autism in children
Autism in children: the warning signs
Who received the vaccine, the same as among those who did not receive. In addition, in the course of serious safety studies of vaccination conducted by the Institute of Medicine, found no evidence of links between autism and vaccination. Organizations such as the Centers for Disease Control and Prevention, Office of the Food and Drug Administration, the American Academy of Pediatrics and the World Health Organization also made a conclusion about the absence of the relationship.