Reference: Obsessions manifest themselves as

Moreira, P S et al. “The neural correlates of obsessive-compulsive disorder: a multimodal perspective.” Translational psychiatry vol. 7,8 e1224. 29 Aug. 2017, doi:10.1038/tp.2017.189*

Available from:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5611752/

*Citation note. The citation show is as provided by the source.