Many researchers suspect that individuals with Tourette Syndrome (TS) may have a poor
cognitive ability (i.e., response inhibition; RI) that is essential to inhibit inappropriate
response such as vocal or motor tics. The investigators aim to test whether a
well-established behavior therapy for TS can be improved by increasing the individual's RI
capabilities. To this end, 20 children will be randomly assigned to behavior therapy with
computer-based RI training or behavior therapy with placebo computer-based cognitive
training. The investigators will test the hypothesis that computer-based RI training can be a
useful addition to the well-established behavior therapy to enhance its therapeutic effect.