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Previous research in the visual and auditory systems supports a two\u2010stage processing hierarchy that underlies perceptual categorization: (a) a \u201cbottom\u2010up\u201d perceptual stage in sensory cortices where neurons show selectivity for stimulus features and (b) a \u201ctop\u2010down\u201d second stage in higher level cortical areas that categorizes the stimulus\u2010selective input from the first stage. In order to test the hypothesis that the two\u2010stage model applies to the somatosensory system, 14 human participants were trained to categorize vibrotactile stimuli presented to their right forearm. Then, during an fMRI scan, participants actively categorized the stimuli. Representational similarity analysis revealed stimulus selectivity in areas including the left precentral and postcentral gyri, the supramarginal gyrus, and the posterior middle temporal gyrus. Crucially, we identified a single category\u2010selective region in the left ventral precentral gyrus. Furthermore, an estimation of directed functional connectivity delivered evidence for robust top\u2010down connectivity from the second to first stage. These results support the validity of the two\u2010stage model of perceptual categorization for the somatosensory system, suggesting common computational principles and a unified theory of perceptual categorization across the visual, auditory, and somatosensory systems.<\/jats:p>","DOI":"10.1002\/hbm.24581","type":"journal-article","created":{"date-parts":[[2019,3,28]],"date-time":"2019-03-28T15:10:11Z","timestamp":1553785811000},"page":"3078-3090","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Neural mechanisms of vibrotactile categorization"],"prefix":"10.1002","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1920-5933","authenticated-orcid":false,"given":"Patrick S.","family":"Malone","sequence":"first","affiliation":[{"name":"Department of Neuroscience Georgetown University Medical Center  Washington District of Columbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Silvio 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