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sensory phenomena
Sensory phenomena are general feelings, urges or bodily sensations that precede or accompany repetitive behaviors〔Miguel EC, do Rosario-Campos MC, Shavitt RG, et al. The tic-related obsessive-compulsive disorder phenotype and treatment implications. ''Adv Neurol.'' 2001;85:43-55. PMID 11530446〕 associated with Tourette syndrome and tic disorders. These phenomena are also defined as "generalized or focal uncomfortable feelings or sensations preceding tics that usually are relieved by the movement".〔The Tourette Syndrome Classification Study Group. Definitions and classification of tic disorders. ''Arch Neurol.'' 1993 Oct;50(10):1013-6. PMID 8215958 (Full text. )〕
Sensory phenomena resemble urges or sensations associated with akathisia and restless legs syndrome, in which motor movement also relieves the unpleasant sensation. "Individuals with tics may have either a generalized or a localized sensation of tension that is relieved by movement, ie, the tic."〔Kurlan K, Lichter D, Hewitt D. Sensory tics in Tourette's Syndrome. ''Neurology.'' 1989;39:731-734. PMID 2710364〕
Sensory phenomena include bodily sensations, mental urges, and a sense of inner tension, feelings of incompleteness, and a need for things to be "just right". Bodily sensations include focal or generalized body sensations (usually tactile, muscular-skeletal/visceral, or both); mental sensations include urge only, energy release (mental energy that builds up and needs to be discharged), incompleteness, and just-right perceptions. They may be an important measure for grouping patients along the OCD-Tourette's disorder spectrum.〔Miguel EC, do Rosario-Campos MC, Prado HS, et al. Sensory phenomena in obsessive-compulsive disorder and Tourette's disorder. ''J Clin Psychiatry''. 2000 Feb;61(2):150-6. PMID 10732667〕 The presence of sensory phenomena differentiates subjects with Tourette syndrome plus obsessive-compulsive disorder (OCD) from subjects with OCD alone.〔
In contrast to the stereotyped movements of other movement disorders (e.g.; choreas, dystonias, myoclonus, and dyskinesias), the tics of Tourette's are temporarily suppressible and preceded by a premonitory urge.〔Jankovic J. Differential diagnosis and etiology of tics. ''Adv Neurol.'' 2001;85:15-29. PMID 11530424〕 Immediately preceding tic onset, most individuals with Tourette syndrome are aware of an urge,〔Cohen AJ, Leckman JF. Sensory phenomena associated with Gilles de la Tourette's syndrome. ''J Clin Psychiatry''. 1992 Sep;53(9):319-23. PMID 1517194〕 which is similar to the need to sneeze or scratch an itch. Individuals describe the need to tic as the buildup of tension in a particular anatomical location,〔Bliss J. Sensory experiences of Gilles de la Tourette syndrome. ''Arch Gen Psychiatry''. 1980 Dec;37(12):1343-7. PMID 6934713 〕 which they consciously choose to release, as if the subject "had to do it".〔 Kwak C, Dat Vuong K, Jankovic J. Premonitory sensory phenomenon in Tourette's syndrome. ''Mov Disord''. 2003 Dec;18(12):1530-3. PMID 14673893〕 Examples of the premonitory urge are the feeling of having something in one's throat, or a localized discomfort in the shoulders, leading to the need to clear one's throat or shrug the shoulders. The actual tic may be felt as relieving this tension or sensation, similar to scratching an itch. Another example is blinking to relieve an uncomfortable sensation in the eye. Published descriptions of the tics of Tourette's identify sensory phenomena as the core symptom of Tourette syndrome, even though they are not included in the diagnostic criteria.〔Scahill LD, Leckman JF, Marek KL. Sensory phenomena in Tourette's syndrome. ''Adv Neurol''. 1995;65:273-80. PMID 7872145 〕〔Miguel EC, do Rosario-Campos MC, Prado HS, et al. Sensory phenomena in obsessive-compulsive disorder and Tourette's disorder. ''J Clin Psychiatry''. 2000 Feb;61(2):150-6. PMID 10732667 〕
==References==
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