REPORT ABNORMAL PSYCHOLOGY

stereotypic movements are much less common and exhibited in 3% – 4% of children.
Among individuals with intellectual disability, there are 4% – 16% engage in
stereotypy and self-injury, while among individuals with intellectual disability living
in residential facilities, 10% – 15% may have stereotypic movement disorder with
self-injury
For the tourette disorder, there are 0.3% – 0.8% of school-age children and
estimated that there are 3 per 1,000 of clinically identified cases in the U.S. Males are
affected more than females, with a ratio of between 2:1 and 4:1. There is insufficient
date available about the prevalence of persistent (chronic) motor or vocal tic disorder,
provisional tic disorder, other specified tic disorder, or unspecified tic disorder.
6.2 Types of Motor Disorders
People with tic disorders can have motor, vocal, or a combination of the 2
types of tics. There are seven types of motor disorders listed in the DSM-5 which are
developmental coordination disorder, stereotypic movement disorder, tourette’s
disorder, motor tic disorder, provisional tic disorder, other specifies tic disorder and
unspecified tic disorder.
6.3 Symptoms of Motor Disorder
Developmental coordination disorder (DCD) starts in childhood and leads to
clumsiness and coordination disorders. Compared with other people of the same age,
children with this disease have impaired motor coordination. Symptoms included
clumsy, lactation and swallowing problems during the first 12 months of life, sitting
late, crawling and walking, difficulties with large motor skills such as jumping on one
foot, jumping and standing, difficulties with good motor skills, for example, writing,
cutting with scissors, tying shoelaces.
The term stereotypic movement disorder refers to a movement or movement
disorder characterized by repetitive movements, such as a head collision or body sway
for more than four weeks. As the level of stress or boredom increases, exercise tends
30