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We used two techniques to render prime pictures invisible: continuous flash suppression (CFS), which obliterates input into ventral temporal regions, but leaves dorsal stream processes largely unaffected, and backward masking (BM), which allows suppressed information to reach both ventral and dorsal stream structures. Categorically congruent primes suppressed under CFS facilitate categorization of tools but have no effect on nonmanipulable objects; in contrast, primes rendered invisible through BM facilitate target categorization for both tools and nonmanipulable things. Our findings demonstrate that information computed by the dorsal stream is used in object categorization, but only for a category of manipulable objects.<\/jats:p>","DOI":"10.1073\/pnas.0805867105","type":"journal-article","created":{"date-parts":[[2008,9,22]],"date-time":"2008-09-22T20:45:06Z","timestamp":1222116306000},"page":"15214-15218","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":153,"title":["Unconscious processing dissociates along categorical lines"],"prefix":"10.1073","volume":"105","author":[{"given":"Jorge","family":"Almeida","sequence":"first","affiliation":[{"name":"*Cognitive Neuropsychology Laboratory and"},{"name":"Vision Sciences Laboratory, Harvard University, Cambridge, MA 02138; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bradford Z.","family":"Mahon","sequence":"additional","affiliation":[{"name":"*Cognitive Neuropsychology Laboratory and"},{"name":"Center for Mind\/Brain Sciences, University of Trento, 38068 Rovereto, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ken","family":"Nakayama","sequence":"additional","affiliation":[{"name":"Vision Sciences Laboratory, Harvard University, Cambridge, MA 02138; 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