The main characteristic of tic disorders is the presence of motor or vocal tics. Tics are defined as sudden, rapid, recurrent, nonrhythmic, sterotyped motor movements or vocalizations. They are not “nervous habits” as many people believe. Those with tic disorders are able to suppress tics for brief periods of time, but stress and fatigue exacerbate tics. There are three main categories of tic disorders including Tourette 's disorder, persistent (chronic) motor or vocal tic disorder, and provisional tic disorder. These categories can be viewed on a continuum with transient tic disorder on mild side and Tourette’s disorder on the severe side.
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For one, there are significant deficits seen in the social abilities of those with autism spectrum disorders. They have difficulties forming secure attachments or being attached to others, including their parents. However, this is primarily due to their inability to understand and respond to social information. Furthermore, they lack the ability to imitate others, which is how many children learn social norms and begin to understand relationships. In particular, they lack the ability to perceive and express emotion. This deficit results in them being insensitive to facial expressions and subtle social cues and therefore experiencing difficulty mimicking expressions Individuals with autism spectrum disorders also experience extreme deficits in social orienting and joint attention. More specifically, they cannot spontaneously orient to naturally occurring social stimuli in their environment and are unable to coordinate attention between interactive social partners and display an awareness of the situation. This is seen in their inability to make eye contact and use gaze and gestures during interactions. They also display difficulties in requesting information and taking turns. Additionally, they have impaired skills in sharing, pretend or symbolic play, and understanding others. The ability to engage in pretend play is vital to the development of language