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A tic is a sudden and repetitive motor movement or vocalization that is not rhythmic and involves discrete muscle groups. [1] [2] [3] Tics are typically brief and may resemble a normal behavioral characteristic or gesture. [4] Tics can be invisible to the observer, such as abdominal tensing or toe crunching.
The Autism – Tics, ADHD, and other Comorbidities Inventory (A–TAC) is a psychological measure used to screen for other conditions occurring with tics. [ 1 ] [ 2 ] Along with tic disorders , it screens for autism spectrum disorders, attention deficit hyperactivity disorder (ADHD) and other conditions with onset in childhood. [ 1 ]
In the fourth revision of the DSM , tic disorders were classified as follows: [12] Transient tic disorder consisted of multiple motor and/or phonic tics with duration of at least 4 weeks, but less than 12 months. Chronic tic disorder was either single or multiple motor or phonic tics, but not both, which were present for more than a year.
Autistic adults' verbal communication skills largely depend on when and how well speech is acquired during childhood. [103] Autistic people display atypical nonverbal behaviors or show differences in nonverbal communication. They may make infrequent eye contact, even when called by name, or avoid it altogether.
Echolalia and echopraxia are distinguishing tics of Tourette syndrome (TS); [1] the echolalic repetitions of individuals with TS are mainly echoes from within their own "tic repertoire". [1] Evidence points to a healthy mirror neuron system (MNS), but "inadequate imitation-control mechanism, which make them vulnerable to interferences".
[90] [98] Less than 10% of autistic youth have attempted suicide, [94] but 15% to 25% autistic adults have. [ 93 ] [ 95 ] The rates of suicide attempts are the same among people formally diagnosed with autism and those who have typical intelligence and are believed to have autism but have not been diagnosed. [ 93 ]
In a 2003 study by Shytle and colleagues, a survey was sent to parents from a TS group email list, asking them to rate the frequency and relative significance of 32 behavioral and emotional symptoms observed in their children. [2] Of 35 respondents, 80% concurred that behavioral and emotional symptoms were more afflicting than tics. [2]
Conditions that may manifest tics or stereotyped movements include developmental disorders; autism spectrum disorders [4] and stereotypic movement disorder; [1] [5] Sydenham's chorea; idiopathic dystonia; and genetic conditions such as Huntington's disease, neuroacanthocytosis, pantothenate kinase-associated neurodegeneration, Duchenne muscular ...