tailieunhanh - Toefl IBT listening skill part 4

Tham khảo tài liệu 'toefl ibt listening skill part 4', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 56 READING MODULE block the images. Holding onto objects that would normally be discarded such as newspapers and empty containers is another common compulsion. OCD symptoms generally begin between the age of 10 and 24 and continue indefinitely until a person seeks treatment. A child s upbringing does not seem to be part of the cause of the disorder though stress can make the symptoms stronger. The underlying causes of OCD have been researched greatly and point to a number of different genetic factors. While studies show that OCD and its related anxiety disorders are often passed down through families the specific symptoms for each family member are rarely the same. For example a mother who is obsessed with order may have a son who can t stop thinking about a single word or number. Research on OCD sufferers has found certain physiological trends. In particular many studies show an overactivity of blood circulation in certain areas of the brain. As a result of this increase in blood flow the sero-toninergic system which regulates emotions is unable to function effectively. Studies have also shown that OCD sufferers have less serotonin than the average person. This type of abnormality is also observed in Tourette syndrome and Attention Deficit Hyperactive Disorder. People who developed tics as children are found to be more susceptible to OCD as well. Many reports of OCD point to infections that can trigger the disorder namely streptococcal infections. It is believed that a case of childhood strep throat can elicit a response from the immune system that produces certain neuropsychiatric disorders such as OCD. Because OCD sufferers tend to be so secretive about their symptoms they often put off treatment for many years. The average OCD sufferer waits about 17 years before receiving medical attention. As with many anxiety disorders early diagnosis and proper medication can lessen many of the symptoms and allow people to live fairly normal lives. Most treatment plans for