New tics may also begin as imitations of normally occurring events, such as mimicking a dog barking. How
these particular triggers come to
form enduring symptoms is a matter for
In some cases, neuropsychiatric disorders, such as tic disorders and obsessive-compulsive disorder, have been shown to develop after streptococcal infection. No precise mechanism for this connection has been determined, although it appears to be related to the autoimmune system.