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Feedback projections and multisensory convergence in higher-level association areas of cat cortex
Multiple Paper Presentation
Helen Ruth Clemo
Department of Physiology, Virginia Commonwealth University
Alex Meredith
Anatomy and Neurobiology, Virginia Commonwealth University Abstract ID Number: 125
Abstract
Recent studies have identified feedback projections from non-visual areas into primary visual cortex and from non-auditory areas into lower-level auditory cortex. The present studies examined the nature of cross-modal projections to higher-level association cortices using neuroanatomical and electrophysiological techniques. While anatomical data revealed projectional features consistent with feedback-like connections, the functional data indicated that some of these projections have cross-modal inhibitory, rather than excitatory, effects. Not only might such connectional patterns underlie subtle modulatory effects of one modality by another, but also may account for the paucity of documented 'bimodal' neurons in the primary cortices known to receive cross-modal feedback projections. Such cross-modal modualtory influences would also be consistent with top-down control of sensory processing. Supported by NIH grant NS39460.
To be Presented at the Following Symposium:
Contributions of Feedforward, Feedback and Lateral projections to Multisensory Convergence and Integration.
Other papers in this Symposium:
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