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Publication Detail
Cortico-cortical connectivity in ferret auditory cortex
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Bizley JK, Bajo VM, Nodal FR, King AJ
  • Journal:
    The Journal of Comparative Neurology
  • Addresses:
    University College London
    London

    University of Oxford
    Oxford
Abstract
Despite numerous studies of auditory cortical process- ing in the ferret (Mustela putorious), very little is known about the connections between the different regions of the auditory cortex that have been characterized cytoarchitectonically and physiologically. We examined the distribution of retrograde and anterograde labeling after injecting tracers into one or more regions of ferret auditory cortex. Injections of different tracers at frequency-matched locations in the core areas, the pri- mary auditory cortex (A1) and anterior auditory field (AAF), of the same animal revealed the presence of reciprocal connections with overlapping projections to and from discrete regions within the posterior pseudo- sylvian and suprasylvian fields (PPF and PSF), suggest- ing that these connections are frequency specific. In contrast, projections from the primary areas to the anterior dorsal field (ADF) on the anterior ectosylvian gyrus were scattered and non-overlapping, consistent with the nontonotopic organization of this field. The relative strength of the projections originating in each of the primary fields differed, with A1 predominantly tar-geting the posterior bank fields PPF and PSF, which in turn project to the ventral posterior field, whereas AAF projects more heavily to the ADF, which then projects to the anteroventral field and the pseudosylvian sulcal cortex. These findings suggest that parallel anterior and posterior processing networks may exist, although the connections between different areas often overlap and interactions were present at all levels. J. Comp. Neurol. 000:000–000, 2015.
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