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The purpose of the present investigation was to examine the connectional adaptations that might subserve this plasticity. We deposited biotinylated dextran amine (BDA; 3,000 MW), a retrograde tracer, unilaterally into the posterior portion of the suprasylvian fringe, corresponding to area DZ of hearing, early\u2010deafened (onset &lt;1 month), and late\u2010deafened (onset &gt;3 months) cats to reveal cortical afferent projections. Overall, the pattern of cortical projections to DZ was similar in both hearing and deafened animals. However, there was a progressive increase in projection strength among hearing and late\u2010 and early\u2010deafened cats from an extrastriate visual cortical region known to be involved in the processing of visual motion, the posterolateral lateral suprasylvian area (PLLS). Additionally, although no such change was documented for the posteromedial lateral suprasylvian area (PMLS), labeled neurons were present within a subregion of PMLS devoted to foveal vision in both late\u2010 and early\u2010deafened animals but not in hearing controls. PMLS is also an extrastriate visual motion processing area and is widely considered to be the homolog of primate middle temporal area. No changes in auditory cortical connectivity were observed among groups. These observations suggest that amplified cortical projections from extrastriate visual areas involved in visual motion processing to DZ may contribute to the cross\u2010modal reorganization that functionally manifests as superior visual motion detection ability in the deaf animal. J. Comp. Neurol. 522:654\u2013675, 2014. \u00a9 2013 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/cne.23439","type":"journal-article","created":{"date-parts":[[2013,7,29]],"date-time":"2013-07-29T14:51:58Z","timestamp":1375109518000},"page":"654-675","source":"Crossref","is-referenced-by-count":66,"title":["Cross\u2010modal reorganization of cortical afferents to dorsal auditory cortex following early\u2010 and late\u2010onset deafness"],"prefix":"10.1002","volume":"522","author":[{"given":"Melanie A.","family":"Kok","sequence":"first","affiliation":[{"name":"Graduate Program in Neuroscience University of Western Ontario London Ontario N6A 5C1 Canada"},{"name":"Schulich School of Medicine and Dentistry University of Western Ontario London Ontario N6A 5C1 Canada"},{"name":"Cerebral Systems Laboratory University of Western Ontario London Ontario N6A 5C1 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