Pawelzik, Klaus Richard

[["dc.bibliographiccitation.firstpage","367"],["dc.bibliographiccitation.journal","Neurocomputing"],["dc.bibliographiccitation.lastpage","374"],["dc.bibliographiccitation.volume","26-27"],["dc.contributor.author","Ernst, Udo"],["dc.contributor.author","Pawelzik, Klaus"],["dc.contributor.author","Wolf, Fred"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2017-09-07T11:46:13Z"],["dc.date.available","2017-09-07T11:46:13Z"],["dc.date.issued","1999"],["dc.description.abstract","In many experiments it has been found that stimuli outside the classical receptive-field of orientation-selective cells in the visual cortex can strongly modulate the response properties of these cells. Typically, stimuli with orientation contrasts lead to enhancement, whereas iso-orientation stimuli lead to suppression of the neuronal activity, but these phenomena in general depend in a complicate manner on various parameters like stimulus configuration, contrast, and geometry. In this contribution, we develop a simple theory for such non-classical receptive-field phenomena. We explain the basic mechanisms by a fixed-point analysis. Within this analysis, center-surround experiments can be described by trajectories in parameter space. This allows for a systematic variation of the coupling and stimulation constants. We show that the strength or sign of the enhancement or suppression should not only vary with the experimental paradigm but also with the position of the cell within the cortex. Our results suggest that non-classical receptive-field phenomena are mediated through orientation-specific lateral excitatory interactions."],["dc.identifier.doi","10.1016/s0925-2312(99)00026-0"],["dc.identifier.gro","3151865"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8695"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0925-2312"],["dc.subject","Receptive fields; Visual cortex; Orientation contrast sensitivity; Fixed-point analysis; Center-surround phenomena"],["dc.title","Theory of non-classical receptive field phenomena in the visual cortex"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","361"],["dc.bibliographiccitation.lastpage","366"],["dc.contributor.author","Ernst, Udo"],["dc.contributor.author","Pawelzik, Klaus"],["dc.contributor.author","Wolf, Fred"],["dc.contributor.author","Geisel, Theo"],["dc.contributor.editor","Bower, James M."],["dc.date.accessioned","2017-09-07T11:45:41Z"],["dc.date.available","2017-09-07T11:45:41Z"],["dc.date.issued","1998"],["dc.description.abstract","Recently Sillito and coworkers18,12 demonstrated that Stimulation beyond the classical receptive field (RF) can not only modulate, but radically change a neuron\\’s response to oriented stimuli. They revealed that patch-suppressed cells when stimulated with contrasting orientations inside and outside their classical RF can strongly respond to stimuli oriented orthogonal to their nominal preferred orientation."],["dc.identifier.doi","10.1007/978-1-4615-4831-7_60"],["dc.identifier.gro","3151842"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8669"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.publisher","Springer"],["dc.publisher.place","Boston, MA"],["dc.relation.doi","10.1007/978-1-4615-4831-7"],["dc.relation.eisbn","978-1-4615-4831-7"],["dc.relation.isbn","978-1-4613-7190-8"],["dc.relation.ispartof","Computational Neuroscience"],["dc.title","Orientation Contrast Enhancement Modulated by Differential Long-Range Interactions in Visual Cortex"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.volume","1327"],["dc.contributor.author","Ernst, Udo"],["dc.contributor.author","Pawelzik, Klaus"],["dc.contributor.author","Wolf, Fred"],["dc.contributor.author","Geisel, Theo"],["dc.contributor.editor","Gerstner, Wulfram"],["dc.contributor.editor","Germond, Alain"],["dc.contributor.editor","Hasler, Martin"],["dc.contributor.editor","Nicoud, Jean-Daniel"],["dc.date.accessioned","2017-09-07T11:45:40Z"],["dc.date.available","2017-09-07T11:45:40Z"],["dc.date.issued","2005"],["dc.description.abstract","We propose a simple mechanism for the nonclassical receptive field property of orientation contrast sensitivity. Our model includes the long-range lateral connections linking cell populations of similar orientation preference, and the dynamics of local microcircuits which introduce a differential interaction whose sign depends on the post- and presynaptic activation. We demonstrate that the geometry of an orientation preference map determines the positions of cells sensitive for orientation contrasts, and we propose a simple statistical method to check the predictions of our model for experimentally given maps."],["dc.identifier.doi","10.1007/bfb0020161"],["dc.identifier.gro","3151840"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8667"],["dc.language.iso","en"],["dc.notes.status","public"],["dc.notes.submitter","chake"],["dc.publisher","Springer"],["dc.publisher.place","Berlin, Heidelberg"],["dc.relation.isbn","978-3-540-63631-1"],["dc.relation.ispartof","Lecture Notes in Computer Science"],["dc.relation.issn","0302-9743"],["dc.title","Geometry of orientation preference map determines nonclassical receptive field properties"],["dc.type","book_chapter"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Pawelzik, Klaus"],["dc.contributor.author","Ernst, Udo"],["dc.contributor.author","Wolf, F."],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2017-11-21T13:53:15Z"],["dc.date.available","2017-11-21T13:53:15Z"],["dc.date.issued","1996"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/10152"],["dc.language.iso","en"],["dc.notes.status","new -primates"],["dc.relation.ispartof","In Proceedings of the Conference on Neural Information Processing Systems, NIPS’96"],["dc.title","Orientation contrast sensitivity from long-range interactions in visual cortex"],["dc.type","book_chapter"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Pawelzik, Klaus"],["dc.contributor.author","Ernst, Udo"],["dc.contributor.author","Wolf, F."],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2017-11-21T14:20:39Z"],["dc.date.available","2017-11-21T14:20:39Z"],["dc.date.issued","1998"],["dc.format.extent","759"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/10157"],["dc.language.iso","en"],["dc.notes.status","new -primates"],["dc.publisher","Georg-Thieme-Verlag"],["dc.publisher.place","Stuttgart/New York"],["dc.relation.ispartof","New Neuroethology on the Move - Proceedings of the 26th Göttingen Neurobiology Conference"],["dc.title","Orientation Preference Geometry Modulated Nonclassical Receptive Field Properties"],["dc.type","book_chapter"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]