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### Tic suppression  Since tic suppression is part of Comprehensive Behavioral Intervention for Tics (CBIT) and Exposure and Response Prevention (ERP), there has been increased interest in investigating the characteristics of tic suppression and the factors that affect it. A study of 26 TS adolescents compared free ticcing with a tic suppression condition \citep{25786675}. During the free ticcing condition tic distribution across body locations was consistent with the general view that most tics occur at the level of the shoulders and above. Eye tics were the most frequent followed by facial/cervical tics. Limb tics and tics involving the trunk were the least common. During the tic suppression condition, an increase in eye tics were seen in 10 subjects along with an increase in hand tics in 3 subjects. Tic suppression was most successful when it involved suppression of tics in the body locations that are generally involved in the fewest fewer  tics (such as the legs and the trunk). The authors make the case suggest  that tic suppression involves specific inhibition, specific,  rather than global inhibition, since tic suppression global, inhibition  since some types of tics are easier to suppress than others. Historically different categories have been used to classify tics such as simple vs. complex tics and motor vs. phonic tics. The results of this study suggest that future research may be productive by clarifying the nature of the tics associated with particular body locations in even more detail (i.e., whether premonitory urges are more likely to be associated with tics in particular body locations).  By definition, children with Tourette syndrome (TS) have had tics for over a year. They can often suppress their tics briefly and they do so more effectively when rewarded for successful suppression. It has not been known whether the ability to suppress tics develops only with practice over the years of having tics  or whether the ability to suppress tics is present when tics initially occur. \citet{Greene_2015_NTsuppress} citet{Greene_2015_NTsuppress}  addressed this question in children whose tics had developed within the past few months. When children received tokens with monetary value for tic-free intervals, they had significantly more of these intervals compared to a baseline, unrewarded condition. This result suggests the possibility that behavior therapy for tics may work, at least for some children, even before TS can be diagnosed. ### Sensory phenomena