Sensory phenomena are general feelings, urges or bodily sensations.[1] They are present in many conditions including autism spectrum disorders,[2] epilepsy,[3] neuropathy,[4] obsessive–compulsive disorder,[2] pain conditions,[5][6] tardive syndromes,[7] and tic disorders.[8]
Sensory phenomena are associated with Tourette syndrome and tic disorders, and defined as "uncomfortable feelings or sensations preceding tics that usually are relieved by the movement".[9] The tics of Tourette's are temporarily suppressible and preceded by a premonitory urge[10] 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,[11] which they may consciously choose to release, or which is released involuntarily.[8] The presence of sensory phenomena differentiates subjects with Tourette syndrome plus obsessive-compulsive disorder (OCD) from subjects with OCD alone,[1] and may be an important measure for grouping patients along the OCD-Tourette's disorder spectrum.[12]
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