Imperial College London

ProfessorSimonSchultz

Faculty of EngineeringDepartment of Bioengineering

Professor of Neurotechnology
 
 
 
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Contact

 

+44 (0)20 7594 1533s.schultz Website

 
 
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Location

 

4.11Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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61 results found

Seemungal BM, Guzman-Lopez J, Arshad Q, Schultz SR, Walsh V, Yousif Net al., 2013, Vestibular Activation Differentially Modulates Human Early Visual Cortex and V5/MT Excitability and Response Entropy, CEREBRAL CORTEX, Vol: 23, Pages: 12-+, ISSN: 1047-3211

JOURNAL ARTICLE

Caballero J, Urigueen JA, Schultz SR, Dragotti PLet al., 2012, SPIKE SORTING AT SUB-NYQUIST RATES, IEEE International Conference on Acoustics, Speech and Signal Processing, Publisher: IEEE, Pages: 585-588, ISSN: 1520-6149

CONFERENCE PAPER

Cheung K, Schultz SR, Luk W, 2012, A large-scale spiking neural network accelerator for FPGA systems, Pages: 113-120, ISSN: 0302-9743

Spiking neural networks (SNN) aim to mimic membrane potential dynamics of biological neurons. They have been used widely in neuromorphic applications and neuroscience modeling studies. We design a parallel SNN accelerator for producing large-scale cortical simulation targeting an off-the-shelf Field-Programmable Gate Array (FPGA)-based system. The accelerator parallelizes synaptic processing with run time proportional to the firing rate of the network. Using only one FPGA, this accelerator is estimated to support simulation of 64K neurons 2.5 times real-time, and achieves a spike delivery rate which is at least 1.4 times faster than a recent GPU accelerator with a benchmark toroidal network. © 2012 Springer-Verlag.

CONFERENCE PAPER

Phoka E, Wildie M, Schultz SR, Barahona Met al., 2012, Sensory experience modifies spontaneous state dynamics in a large-scale barrel cortical model, JOURNAL OF COMPUTATIONAL NEUROSCIENCE, Vol: 33, Pages: 323-339, ISSN: 0929-5313

JOURNAL ARTICLE

Saleem AB, Longden KD, Schwyn DA, Krapp HG, Schultz SRet al., 2012, Bimodal Optomotor Response to Plaids in Blowflies: Mechanisms of Component Selectivity and Evidence for Pattern Selectivity, JOURNAL OF NEUROSCIENCE, Vol: 32, Pages: 1634-1642, ISSN: 0270-6474

JOURNAL ARTICLE

Saleem AB, Longden KD, Schwyn DA, Krapp HG, Schultz SRet al., 2012, Bimodal optomotor response to plaids in blowflies: mechanisms of component selectivity and evidence for pattern selectivity., J Neurosci, Vol: 32, Pages: 1634-1642

Many animals estimate their self-motion and the movement of external objects by exploiting panoramic patterns of visual motion. To probe how visual systems process compound motion patterns, superimposed visual gratings moving in different directions, plaid stimuli, have been successfully used in vertebrates. Surprisingly, nothing is known about how visually guided insects process plaids. Here, we explored in the blowfly how the well characterized yaw optomotor reflex and the activity of identified visual interneurons depend on plaid stimuli. We show that contrary to previous expectations, the yaw optomotor reflex shows a bimodal directional tuning for certain plaid stimuli. To understand the neural correlates of this behavior, we recorded the responses of a visual interneuron supporting the reflex, the H1 cell, which was also bimodally tuned to the plaid direction. Using a computational model, we identified the essential neural processing steps required to capture the observed response properties. These processing steps have functional parallels with mechanisms found in the primate visual system, despite different biophysical implementations. By characterizing other visual neurons supporting visually guided behaviors, we found responses that ranged from being bimodally tuned to the stimulus direction (component-selective), to responses that appear to be tuned to the direction of the global pattern (pattern-selective). Our results extend the current understanding of neural mechanisms of motion processing in insects, and indicate that the fly employs a wider range of behavioral responses to multiple motion cues than previously reported.

JOURNAL ARTICLE

Schaub MT, Schultz SR, 2012, The Ising decoder: reading out the activity of large neural ensembles, JOURNAL OF COMPUTATIONAL NEUROSCIENCE, Vol: 32, Pages: 101-118, ISSN: 0929-5313

JOURNAL ARTICLE

Seemungal B, Guzman-Lopez J, Arshad Q, Schultz SR, Walsh V, Yousif Net al., 2012, VESTIBULAR ACTIVATION DIFFERENTIALLY MODULATES HUMAN EARLY VISUAL CORTEX AND V5/MT EXCITABILITY AND RESPONSE ENTROPY, Annual Meeting of the Association-of-British-Neurologists, Publisher: BMJ PUBLISHING GROUP, ISSN: 0022-3050

CONFERENCE PAPER

Cook D, Gillies D, Schultz S, 2010, Using GLMs to recover sparse connectivity in complex networks., BMC neuroscience, Vol: 11, Pages: P53-P53, ISSN: 1471-2202

JOURNAL ARTICLE

Phoka E, Wildie M, Petersen RS, Barahona M, Schultz SRet al., 2010, How is a sensory stimulus represented in ongoing dynamics in the barrel cortex?, Pages: P35-P35, ISSN: 1471-2202

CONFERENCE PAPER

Saleem AB, Chadderton P, Apergis-Schoute J, Harris KD, Schultz SRet al., 2010, Methods for predicting cortical UP and DOWN states from the phase of deep layer local field potentials, JOURNAL OF COMPUTATIONAL NEUROSCIENCE, Vol: 29, Pages: 49-62, ISSN: 0929-5313

JOURNAL ARTICLE

Cheung K, Schultz SR, Leong PHW, 2009, A parallel spiking neural network simulator, Sydney, Australia, Pages: 247-254

CONFERENCE PAPER

Schultz SR, Kitamura K, Post-Uiterweer A, Krupic J, Haeusser Met al., 2009, Spatial Pattern Coding of Sensory Information by Climbing Fiber-Evoked Calcium Signals in Networks of Neighboring Cerebellar Purkinje Cells, JOURNAL OF NEUROSCIENCE, Vol: 29, Pages: 8005-8015, ISSN: 0270-6474

JOURNAL ARTICLE

Wildie M, Luk W, Schultz SR, Leong PHW, Fidjeland AKet al., 2009, Reconfigurable acceleration of neural models with gap junctions, Pages: 439-442

We describe the design and implementation of an FPGA-based architecture for real-time simulation of spiking neural networks that include gap junctions, a type of synapse not often used in neural models due to their high computational cost. Recent research suggests that electrical synapses or gap junctions play a role in synchronizing the activity of larger groups of neurons in the brain, and are potentially important in high level functions such as cognition and memory. We suggest the simulation cost of gap junctions can be reduced by clustering them within the model, which is consistent with evidence of the structure of gap junction networks and allows each cluster to be updated in parallel. Our implementation on a Xilinx Virtex-5 FPGA demonstrates a 24.3 times speedup over a software implementation running on a cluster of four 3.6GHz Intel Xeon processors. This is part of a larger effort to construct tools capable of real-time simulation and exploration of realistic brain networks of comparable size to biological networks. © 2009 IEEE.

CONFERENCE PAPER

Saleem AB, Krapp HG, Schultz SR, 2008, Receptive field characterization by spike-triggered independent component analysis, JOURNAL OF VISION, Vol: 8, ISSN: 1534-7362

JOURNAL ARTICLE

Einarsdottir H, Montani F, Schultz SR, 2007, A mathematical model of receptive field reorganization following stroke, IEEE International Conference on Development and Learning, Pages: 211-216

CONFERENCE PAPER

Montani F, Kohn A, Smith MA, Schultz SRet al., 2007, The role of correlations in direction and contrast coding in the primary visual cortex, JOURNAL OF NEUROSCIENCE, Vol: 27, Pages: 2338-2348, ISSN: 0270-6474

JOURNAL ARTICLE

Montani F, Kohn A, Smith MA, Schultz SRet al., 2007, The role of correlations in direction and contrast coding in the primary visual cortex (vol 27, pg 2338, 2007), JOURNAL OF NEUROSCIENCE, Vol: 27, Pages: 5835-5835, ISSN: 0270-6474

JOURNAL ARTICLE

Disney AA, Schultz SR, 2004, Hallucinations and acetylcholine: Signal or noise?, BEHAVIORAL AND BRAIN SCIENCES, Vol: 27, Pages: 790-+, ISSN: 0140-525X

JOURNAL ARTICLE

Rust NC, Schultz SR, Movshon JA, 2002, A reciprocal relationship between reliability and responsiveness in developing visual cortical neurons, JOURNAL OF NEUROSCIENCE, Vol: 22, Pages: 10519-10523, ISSN: 0270-6474

JOURNAL ARTICLE

Panzeri S, Petersen RS, Schultz SR, Lebedev M, Diamond MEet al., 2001, The role of spike timing in the coding of stimulus location in rat somatosensory cortex, NEURON, Vol: 29, Pages: 769-777, ISSN: 0896-6273

JOURNAL ARTICLE

Panzeri S, Schultz SR, 2001, A unified approach to the study of temporal, correlational, and rate coding, NEURAL COMPUTATION, Vol: 13, Pages: 1311-1349, ISSN: 0899-7667

JOURNAL ARTICLE

Schultz SR, Panzeri S, 2001, Temporal correlations and neural spike train entropy, PHYSICAL REVIEW LETTERS, Vol: 86, Pages: 5823-5826, ISSN: 0031-9007

JOURNAL ARTICLE

Panzeri S, Schultz SR, Treves A, Rolls ETet al., 1999, Correlations and the encoding of information in the nervous system, Proceedings of the Royal Society of London Series B: Biological Sciences, Vol: 266, Pages: 1001-1012

JOURNAL ARTICLE

Panzeri S, Treves A, Schultz SR, Rolls ETet al., 1999, On decoding the responses of a population of neurons from short time windows, Neural Computation, Vol: 11, Pages: 1553-1577

JOURNAL ARTICLE

Schultz SR, Rolls ET, 1999, Analysis of information transmission in the Schaffer collaterals, Hippocampus, Vol: 9, Pages: 582-598

JOURNAL ARTICLE

Schultz SR, Treves A, 1998, Stability of the replica symmetric solution for the information conveyed by a neural network, Physical Review E, Vol: 57, Pages: 3302-3310

JOURNAL ARTICLE

Heim P, Schultz SR, Jabri MA, 1995, Technology-independent biasing technique for CMOS analogue micropower implementations of neural networks, Proc. Sixth Australian Conf. on Neural Networks, Sydney, Australia, Pages: 9-12

CONFERENCE PAPER

Leerink LR, Schultz SR, Jabri MA, 1995, A Reinforcement Learning Exploration Strategy based on Ant Foraging Mechanisms, Proc. Sixth Australian Conf. on Neural Networks, Sydney, Australia, Pages: 217-220

CONFERENCE PAPER

Schultz SR, Jabri MA, 1995, An analogue VLSI `integrate-and-fire' neuron with frequency adaptation, Electronics Letters, Vol: 31, Pages: 1357-1358

JOURNAL ARTICLE

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