Projects per year
Abstract
processed by largely independent pathways in the primate cortex, with cross-modal integration only occurring in specialized polysensory areas. This model was challenged by the finding that the peripheral representation of the primary visual cortex (V1) receives monosynaptic connections from areas of the auditory cortex in the macaque. However, auditory projections to V1 have not been reported in other primates. We investigated the existence of direct interconnections between V1 and auditory areas in the marmoset, a New World monkey. Labelled neurons in auditory cortex were observed following 4 out of 10 retrograde tracer injections involving V1. These projections to V1 originated in the caudal subdivisions of auditory cortex (primary auditory cortex, caudal belt and parabelt areas), and targeted parts of V1 that represent parafoveal and peripheral vision. Injections near the representation of the vertical meridian of the visual field labelled few or no cells in auditory cortex. We also placed 8 retrograde tracer injections involving core, belt and parabelt auditory areas,
none of which revealed direct projections from V1. These results confirm the existence of a direct, nonreciprocal projection from auditory areas to V1 in a different primate species, which has evolved separately from the macaque for over 30 million years. The essential similarity of these observations between marmoset and macaque indicate that early-stage audiovisual integration is a shared characteristic of primate sensory processing.
Original language | English |
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Pages (from-to) | 111-131 |
Number of pages | 21 |
Journal | Brain Structure and Function |
Volume | 224 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2019 |
Keywords
- striate cortex
- auditory cortex
- connections
- primate
- audiovisual integration
Projects
- 2 Finished
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ARC Centre of Excellence for Integrative Brain Function
Egan, G. (Primary Chief Investigator (PCI)), Rosa, M. (Chief Investigator (CI)), Lowery, A. (Chief Investigator (CI)), Stuart, G. (Chief Investigator (CI)), Arabzadeh, E. (Chief Investigator (CI)), Skafidas, E. (Chief Investigator (CI)), Ibbotson, M. (Chief Investigator (CI)), Petrou, S. (Chief Investigator (CI)), Paxinos, G. (Chief Investigator (CI)), Mattingley, J. (Chief Investigator (CI)), Garrido, M. (Chief Investigator (CI)), Sah, P. K. (Chief Investigator (CI)), Robinson, P. A. (Chief Investigator (CI)), Martin, P. (Chief Investigator (CI)), Grunert, U. (Chief Investigator (CI)), Tanaka, K. (Partner Investigator (PI)), Mitra, P. (Partner Investigator (PI)), Johnson, G. (Partner Investigator (PI)), Diamond, M. (Partner Investigator (PI)), Margrie, T. (Partner Investigator (PI)), Leopold, D. (Partner Investigator (PI)), Movshon, J. (Partner Investigator (PI)), Markram, H. (Partner Investigator (PI)), Victor, J. (Partner Investigator (PI)), Hill, S. (Partner Investigator (PI)) & Jirsa, V. K. (Partner Investigator (PI))
Australian National University (ANU), Eidgenössische Technische Hochschule Zürich (ETH Zürich) (Federal Institute of Technology Zurich), Australian Research Council (ARC), Karolinska Institutet (Karolinska Institute), Council of the Queensland Institute of Medical Research (trading as QIMR Berghofer Medical Research Institute), Ecole Polytechnique Federale de Lausanne (EPFL) (Swiss Federal Institute of Technology in Lausanne) , Monash University, University of Melbourne, University of New South Wales (UNSW), University of Queensland , University of Sydney, Monash University – Internal University Contribution, NIH - National Institutes of Health (United States of America), Cornell University, New York University, Francis Crick Institute, Scuola Internazionale Superiore di Studi Avanzati (International School for Advanced Studies), Duke University, Cold Spring Harbor Laboratory, RIKEN
25/06/14 → 31/12/21
Project: Research
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Understanding complex networks of connections in the primate cerebral cortex
Rosa, M. (Primary Chief Investigator (PCI)) & Mitra, P. (Partner Investigator (PI))
Australian Research Council (ARC), Monash University
2/01/14 → 31/12/16
Project: Research