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Sergio Neuenschwander

Sergio Neuenschwander

Professor, Brain Institute - Federal University of Rio Grande do Norte (UFRN)
Laboratory: Vislab
Lattes: http://lattes.cnpq.br/9217956361436464
E-mail: neuenschwander@neuro.ufrn.br
Areas of interest: Vision mechanisms

Study of visual mechanisms

An influential notion in neuroscience is that the characterization of response properties of single cells is fundamental for understanding cognitive processes. In the visual system, the finding that responses are generally specific and selective to particular attributes of an object has led to the idea that neurons actually behave as detectors capable of extracting information from the outside world. According to this view, perception would be the result of encoding multiple elementary features through a modular analysis that is both parallel and hierarchical.

Viewing the functional organization of the brain as a collection of individual cells, each performing some kind of feature extraction, belittles, however, the fact that the brain is a highly interconnected structure both within and between processing modules. A more appropriate level of description is to consider cooperative phenomena at the population level. From this perspective, the study of time dependencies in the activity between cells is of considerable interest. A number of investigations from our group and others have shown that neuronal interactions in the visual cortex exhibit high temporal precision in the millisecond range. Neurons firing in synchrony are thought to form transient ensembles of spatially distributed cells, relevant for dynamic integration of signals.

Our work includes methods for studying neuronal interactions during visual perception. In particular we are interested in assessing the role of neuronal synchronization in dynamical binding of features in early visual areas, mechanisms of attention and temporal expectation, and also mechanisms of visuomotor integration and motor planning in the prefrontal cortex. These experiments may contribute to a better understanding of visual cortical processing and the development of an effective visual prosthesis for the blind.


Publications

Pipa, Gordon ; Chen, Zhe ; Neuenschwander, Sergio ; Lima, Bruss ; Brown, Emery N. . Mapping of Visual Receptive Fields by Tomographic Reconstruction. Neural Computation, v. 24, p. 1-36, 2012.
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Haslinger, Robert ; Pipa, Gordon ; Lima, Bruss ; Singer, Wolf ; Brown, Emery N. ; Neuenschwander, Sergio . Context Matters: The Illusive Simplicity of Macaque V1 Receptive Fields. Plos One, v. 7, p. e39699, 2012.
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Womelsdorf, T. ; LIMA, B. ; VINCK, M. ; OOSTENVELD, R. ; SINGER, W. ; Neuenschwander, Sergio ; FRIES, P. . Orientation selectivity and noise correlation in awake monkey area V1 are modulated by the gamma cycle. Proceedings of the National Academy of Sciences of the United States of America, v. 109, p. 4302-4307, 2012.
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Uhlhaas, Peter J. ; Pipa, Gordon ; Neuenschwander, Sergio ; Wibral, Michael ; Singer, Wolf . A new look at gamma? High- (>60 Hz) ?-band activity in cortical networks: Function, mechanisms and impairment. Progress in Biophysics and Molecular Biology, v. 105, p. 14-28, 2011.
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Gerhard, Felipe ; Pipa, Gordon ; Lima, Bruss ; Neuenschwander, Sergio ; Gerstner, Wulfram . Extraction of Network Topology From Multi-Electrode Recordings: Is there a Small-World Effect?. Frontiers in Computational Neuroscience, v. 5, p. 1-13, 2011.
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LIMA, B. ; SINGER, W. ; Neuenschwander, Sergio . Gamma Responses Correlate with Temporal Expectation in Monkey Primary Visual Cortex. The Journal of Neuroscience, v. 31, p. 15919-15931, 2011.
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Lima, Bruss ; Chen, N.-H. ; Singer, Wolf ; Neuenschwander, Sergio . Synchronization Dynamics in Response to Plaid Stimuli in Monkey V1. Cerebral Cortex (New York, N.Y. 1991), v. 20, p. 1556-1573, 2010.
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VINCK, M. ; LIMA, B. ; Womelsdorf, T. ; OOSTENVELD, R. ; SINGER, W. ; Neuenschwander, Sergio ; FRIES, P. . Gamma-Phase Shifting in Awake Monkey Visual Cortex. The Journal of Neuroscience, v. 30, p. 1250-1257, 2010.
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Uhlhaas, Peter ; Pipa, Gordon ; Lima, Bruss ; Melloni, Lucia ; Neuenschwander, Sergio ; Nikolic, D. ; Singer, Wolf . Neural synchrony in cortical networks: history, concept and current status. Frontiers in Integrative Neuroscience, v. 3, p. 17, 2009.
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Baron, Jerome ; Pinto, Lucas ; Dias, Marcelo Oliveira ; Lima, Bruss ; Neuenschwander, Sergio . Directional responses of visual wulst neurones to grating and plaid patterns in the awake owl. European Journal of Neuroscience, v. 26, p. 1950-1968, 2007.
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BIEDERLACK, J ; Castelo-Branco, M ; Neuenschwander, Sergio ; WHEELER, D ; SINGER, W ; NIKOLIC, D . Brightness Induction: Rate Enhancement and Neuronal Synchronization as Complementary Codes. Neuron (Cambridge), v. 52, p. 1073-1083, 2006.
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Stephens, Greg J. ; Neuenschwander, Sergio ; George, John S. ; Singer, Wolf ; Kenyon, Garrett T. . See globally, spike locally: oscillations in a retinal model encode large visual features. Biological Cybernetics, v. 95, p. 327-348, 2006.
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Neuenschwander, Sergio . Activity patterns in human motion-sensitive areas depend on the interpretation of global motion. PNAS. Proceedings of the National Academy of Sciences of the United States of America, v. 99, n. 99, p. 13914-13919, 2002.
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Neuenschwander, Sergio ; Castelo-Branco, Miguel ; Baron, Jerome ; Singer, Wolf . Feed-forward synchronization: propagation of temporal patterns along the retinothalamocortical pathway. Philosophical Transactions of the Royal Society of London. Biological Sciences, London, v. 357, p. 1869-1876, 2002.
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Fries, Pascal ; Neuenschwander, Sergio ; Engel, Andreas K. ; Goebel, Rainer ; Singer, Wolf . Rapid feature selective neuronal synchronization through correlated latency shifting. Nature Neuroscience (Print), USA, v. 4, n. 2, p. 194-200, 2001.
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Castelo-Branco, Miguel ; Goebel, Rainer ; Neuenschwander, Sergio ; Singer, Wolf . Neural synchrony correlates with surface segregation rules. Nature (London), USA, v. 405, n. 6787, p. 685-689, 2000.
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MUNK, M. H. J. ; Neuenschwander, Sergio . High-frequency oscillations (20 to 120 Hz) and their rolel in visual processing.. J Clin Neurophysiol, USA, v. 17, n. 4, p. 341-360, 2000.

Neuenschwander, Sergio ; CASTELO-BRANCIO, M. ; SINGER, W. . Synchronous oscillations in the cat retina. Vision Research, USA, v. 39, n. 15, p. 2485-2497, 1999.
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HERCULANOHOUZEL, S. ; MUNK, M. H. J. ; Neuenschwander, Sergio ; SINGER, W. . Precisely synchronized oscillatory firing patterns require electroencephalografhic activation.. J Neurosci, USA, v. 19, n. 10, p. 3992-4010, 1999.

CASTELOBRANCO, M. ; Neuenschwander, Sergio ; SINGER, W. . Synchronization of visual responses between the cortex, lateral geniculate nucleus, and retina in the anesthetized cat.. J Neurosci, USA, v. 18, n. 16, p. 6395-6410, 1998.

SINGER, W ; ENGEL, A ; KREITER, A ; MUNK, M ; Neuenschwander, Sergio ; ROELFSEMA, P . Neuronal assemblies: necessity, signature and detectability. Trends in Cognitive Sciences, USA, v. 1, n. 7, p. 252-261, 1997.

Neuenschwander, Sergio ; ANGEL, A. K. ; KÖNIG, P. ; SINGER, W. ; VARELA, F. . Synchronization of neuronal responses in the optic tectum of awake pigeons.. Vis Neurosci, USA, v. 13, n. 3, p. 575-584, 1996.

Müller-Gerking, J ; MARTINERIE, J. ; Neuenschwander, Sergio ; PEZARD, L. ; RENAULT, B. ; VARELA, F. . Detecting non-linearities in neuro-electrical signals: A study of synchronous local field potentials. Physica D, v. 94, p. 65-91, 1996.
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Neuenschwander, Sergio ; Singer, Wolf . Long-range synchronization of oscillatory light responses in the cat retina and lateral geniculate nucleus. Nature (London), USA, v. 379, n. 6567, p. 728-733, 1996.

Neuenschwander, Sergio ; Gattass, Ricardo ; Sousa, Aglai P. B. ; Pi?on, Maria Carmen G. P. . Identification and viuotopic organization of areas PO and POd inCebus monkey. The Journal of Comparative Neurology, USA, v. 340, n. 1, p. 65-86, 1994.

Neuenschwander, Sergio. A dynamical analysis of oscillatory responses in the optic tectum. Cognitive Brain Research, USA, v. 1, n. 3, p. 175-181, 1993.
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Neuenschwander, Sergio ; Varela, Francisco J. . Visually Triggered Neuronal Oscillations in the Pigeon: An Autocorrelation Study of Tectal Activity. European Journal of Neuroscience, USA, v. 5, n. 7, p. 870-881, 1993.

GATTASS, R. ; ROSA, M. G. ; SOUSA, A. ; PIÑON, M. ; FIORANI JUNIOR, M. ; Neuenschwander, Sergio . Cortical streams of visual information processing in primates.. Brazilian Journal of Medical and Biological Research, Brasil, v. 23, n. 5, p. 375-393, 1990.

PITELLA, J. E. H. ; Neuenschwander, Sergio . Partial fusion of the mamillary bodies.. Arch Pathol Lab Med, USA, v. 109, p. 567-568, 1985.


Tenure-Track Faculty Position in Neurophysiology: Natal, RN, Brazil

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