deletions | additions       diff --git a/Phenomenology.md b/Phenomenology.md  index 6acc503..f16c901 100644  --- a/Phenomenology.md  +++ b/Phenomenology.md 
...
Total tic severity and vocal tic scores were significantly correlated with scores on the Premonitory Urge for Tics Scale and the University of São Paulo Sensory Phenomena Scale for TS adults \citep{Kano_2015}. The PUTS scores and the USP-SPS scores were correlated with the scores on the Dimensional Yale-Brown Obsessive-Compulsive Scale. In addition, PUTS scores and USP-SPS total scores were both significantly correlated with tic complexity and YGTSS vocal tic scores.  Another study examined the association between premonitory urges and interoceptive awareness \cite{25879819}.Interoceptive awareness was measured by how well subjects could be aware of many times their hearts beat during a specific period of time. Interoceptive awareness, tic severity, and severity of obsessive-compulsive symptoms were used in a multiple regression to predict scores on Premonitory Urge for Tics Scale. Interoceptive awareness was a highly significant predictor of premonitory urges with greater interoceptive awareness being associated with higher PUTS scores. Higher PUTS scores were also associated with greater tic severity but to a lesser extent than interoceptive awareness. The authors suggest that high interoceptive awareness might result in people setting a low threshold for perception of their own internal physiological sensations as an urge to tic. This study, however, also showed that TS subjects generally had lower interoceptive awareness than controls and this result was interpreted as possibly related to downregulation of interoception, perhaps reflecting a compensatory process over the period of time that the person had tics. However, the authors also point out that the reduced interoceptive awareness could reflect the effect of the comorbidities associated with TS.  ### Symptoms and comorbidity  A study of 400 patients seen at a TS specialty clinic found that 39% had coprolalia and 20% had copropraxia \cite{26089672}. When the 222 patients with full comorbidity data were examined, only 13.5% had pure-TS. None of the pure-TS group had coprolalia and none had a family history of obsessive-compulsive disorder. In contrast, 39% of the group with comorbidities exhibited coprolalia. These researchers also found that individuals with complex tics were significantly more likely to report premonitory urges than individuals with simple tics.