Max Planck Institute for Dynamics and Self-Organization -- Department for Nonlinear Dynamics and Network Dynamics Group
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Tuesday, 09.07.2013 17 c.t.

The visual callosal connection: a connection like any other?

by PD Dr. Kerstin Schmidt
from Brain Institute - Federal University of Rio Grande do Norte (UFRN)

Contact person: Fred Wolf


Ludwig Prandtl lecture hall


Recent work about the role of visual callosal connections is presented and morphological and functional homologies between the lateral intrinsic and callosal network in early visual areas are discussed. Both networks selectively link distributed neuronal groups with similar response properties and the actions exerted by callosal input reflect the functional topography of those networks. This supports the notion that callosal connections perpetuate the function of the lateral intrahemispheric circuit onto the other hemisphere. Reversible deactivation studies indicate that the main action of visual callosal input is a multiplicative shift of responses rather than changing response selectivity. Both the gain of that action and its excitatory-inhibitory balance seem to be dynamically adapted to the feed forward drive by the visual stimulus onto primary visual cortex. Finally, experimental evidence supports the hypothesis that based on their distinct architecture close to the VM, both intrinsic and callosal networks facilitate perceptual grouping along potential motion or (shape) trajectories before the visual stimulus arrives.

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