6,536 Hits in 5.5 sec

Stimulus-Specific Oscillations in a Retinal Model

G.T. Kenyon, B.J. Travis, J. Theiler, J.S. George, G.J. Stephens, D.W. Marshak
2004 IEEE Transactions on Neural Networks  
Using a computer model, we show here that such circuitry can account for the stimulus specificity of HFOPs in response to both high-and low-contrast features.  ...  High-frequency oscillatory potentials (HFOPs) in the vertebrate retina are stimulus specific.  ...  In those retinal preparations where the question of stimulus specificity has been directly investigated, primarily in the frog [13] and cat [22] , HFOPs have been shown to be stimulus specific.  ... 
doi:10.1109/tnn.2004.832722 pmid:15484885 fatcat:titcy3azevb53czghnkmyfi3eu

Exploring the function of neural oscillations in early sensory systems

Kilian Koepsell
2010 Frontiers in Neuroscience  
Last, we will describe oscillation-based models of visual processing and explore how they might guide further research.  ...  Thus, we will focus on sensory systems as we ask how neural oscillations arise and how they might encode information about the stimulus.  ...  A second possibility is that retinal oscillations are influenced by the stimulus, specifically, by displacements of the retinal image caused by eye movements.  ... 
doi:10.3389/neuro.01.010.2010 pmid:20582272 pmcid:PMC2891629 fatcat:nnaqglh4yzbytomj6sdhyoivna

A model of high-frequency oscillatory potentials in retinal ganglion cells

2003 Visual Neuroscience  
In the model, axon-mediated feedback pooled signals over a large retinal area, producing HFOPs that were similarly size dependent. (3) HFOPs are stimulus specific.  ...  In the retinal model, this phase variability resulted from the nonlinear properties of axon-mediated feedback in combination with synaptic noise. (2) HFOPs increase as a function of stimulus size up to  ...  Retinal HFOPs are stimulus specific. In the model, gap junctions played a critical role in phase locking oscillations within contiguously stimulated regions.  ... 
doi:10.1017/s0952523803205010 pmid:14977326 pmcid:PMC3348786 fatcat:udjtj2kmpvdj7ijiaswhxdi3vu

Visual course control in flies relies on neuronal computation of object and background motion

1988 Trends in Neurosciences  
In a combination of both behavioural and electrophysiological analysis and modelling, this article establishes the neural mechanisms by which the visual system of the fly evaluates two types of basic retinal  ...  Separate neuronal networks are specifically tuned to each of these motion patterns and make use of them in two different visual orientation tasks.  ...  Acknowledgements We are grateful to A.  ... 
doi:10.1016/0166-2236(88)90057-4 pmid:2469195 fatcat:oca3o3we35e4tcijepvhznzsi4

Survey of electrically evoked responses in the retina - stimulus preferences and oscillation among neurons

David Tsai, John W. Morley, Gregg J. Suaning, Nigel H. Lovell
2017 Scientific Reports  
longer than the stimulus duration.  ...  This is due primarily to the absence of a comprehensive survey on evoked responses for all neuronal types within the target network, across a range of stimulus configurations.  ...  Oscillations could be generated by: (i) spontaneously oscillating neurons 41 ; (ii) neurons that resonate in response to a stimulus through ionic channel mechanisms 42 ; and/or (iii) network interaction  ... 
doi:10.1038/s41598-017-14357-1 pmid:29062068 pmcid:PMC5653866 fatcat:kgyd5ye5x5cabfltrlykhzfuxq

Blockade of Retinal Oscillations by Benzodiazepines Improves Efficiency of Electrical Stimulation in the Mouse Model of RP, rd10

Jana Gehlen, Stefan Esser, Kim Schaffrath, Sandra Johnen, Peter Walter, Frank Müller
2020 Investigative Ophthalmology and Visual Science  
In animal models of RP, a pathologic rhythmic activity seems to compromise the efficiency of retinal ganglion cell stimulation by an electrical prosthesis.  ...  In RP, photoreceptors degenerate. Retinal prostheses are considered a suitable strategy to restore vision.  ...  First, inhibitory amino acids or benzodiazepines could be delivered specifically and continuously to the retina in a targeted manner.  ... 
doi:10.1167/iovs.61.13.37 pmid:33252632 pmcid:PMC7705397 fatcat:oojizmrhaff47medly2wcgrkwe

Retinal oscillations carry visual information to cortex

Kilian Koepsell
2009 Frontiers in Systems Neuroscience  
The other operates in the gamma frequency band (40-80 Hz) and is encoded by spike time relative to the retinal oscillations.  ...  One channel, which occupies a low frequency band (<30 Hz), is encoded by average firing rate with respect to the stimulus and carries information about local changes in the image over time.  ...  The remaining analysis was performed using IPython (Pérez and Granger, 2007) and NumPy/SciPy (Oliphant, 2007) , an open-source software environment written in Python.  ... 
doi:10.3389/neuro.06.004.2009 pmid:19404487 pmcid:PMC2674373 fatcat:tmwzgto2rfgltgwrchtzr4l2yy

Correlated Firing Improves Stimulus Discrimination in a Retinal Model

Garrett T. Kenyon, James Theiler, John S. George, Bryan J. Travis, David W. Marshak
2004 Neural Computation  
In separate experiments in which neurons were synchronized in a stimulus-dependent manner without attendant oscillations, the Fano factor increased markedly with stimulus intensity, implying that stimulus-dependent  ...  Here, we show that the loss of rate-coded information between retinal ganglion cells due to synchronous oscillations can be overcome by exploiting the information encoded by the correlations themselves  ...  In the spike trains generated by the retinal model, the synchronous oscillations evoked by a maximum intensity bar stimulus resulted in a qualitatively similar increase in the number of synchronous events  ... 
doi:10.1162/0899766041941916 pmid:15476601 fatcat:eao6kj5k5nabjhbudlprsu7xc4

Electrical Stimulation of Inner Retinal Neurons in Wild-Type and Retinally Degenerate (rd/rd) Mice

Morven A. Cameron, Gregg J. Suaning, Nigel H. Lovell, John W. Morley, Laura Frishman
2013 PLoS ONE  
The most striking difference between genotypes was the existence of a large amplitude oscillation in the majority of INL cells in rd/rd mice (as previously reported) that impacted on the signal to noise  ...  in wild-type and retinally degenerate (rd/rd) mice.  ...  a non-retinally degenerate animal model.  ... 
doi:10.1371/journal.pone.0068882 pmid:23874798 pmcid:PMC3708954 fatcat:76wkdxbsgna4bdhhcvjr6zj7qa

Processing of figure and background motion in the visual system of the fly

W. Reichardt, M. Egelhaaf, Ai-ke Guo
1989 Biological cybernetics  
The mechanisms underlying these tasks were analyzed by a combination of quantitative behavioral experiments on tethered flying flies (Musca domestica) and model simulations using different conditions of  ...  The visual system of the fly is able to extract different types of global retinal motion patterns as may be induced on the eyes during different flight maneuvers and to use this information to control  ...  In addition, we thank Prof. Grtz for the graphics computer program which simulates the properties of a two-dimensional array of movement detectors as part of the entire simulation program.  ... 
doi:10.1007/bf00200799 fatcat:eyjbq2hyevah5dzgimhzixjowi

Correlations between specific patterns of spontaneous activity and stimulation efficiency in degenerated retina

Christine Haselier, Sonia Biswas, Sarah Rösch, Gabriele Thumann, Frank Müller, Peter Walter, William Rowland Taylor
2017 PLoS ONE  
Here we describe this abnormal activity also in a pharmacologically-induced (MNU) mouse model of retinal degeneration.  ...  Recent studies revealed abnormal rhythmic activity in the retina of genetic mouse models of retinitis pigmentosa.  ...  Janis Brusius for their help in the evaluation of MEA recordings. Parts of this publication have been used in the PhD Thesis (RWTH Aachen University) of CH.  ... 
doi:10.1371/journal.pone.0190048 pmid:29281713 pmcid:PMC5744965 fatcat:q36b47uakzakpmxdhu35ebqwqu

Neural Mechanisms of Visual Feature Binding Investigated with Microelectrodes and Models

Reinhard Eckhorn
1999 Visual Cognition  
A third temporal coding aspect is temporal segmentation by the short activation-inhibition cycles of fast oscillations or short transient stimulus-locked responses, which may prevent perceptual "smearing  ...  A single object generally activates neurones in many visual cortical areas corresponding to a distributed representation of its features.  ...  FIG. 5 . 5 Synchronization among cortical orientation detectors is stimulus specific and spatially limited. (a) Orientation specific synchronization at high oscillation frequencies (35-90 Hz).  ... 
doi:10.1080/135062899394975 fatcat:irap5j2adndztnojjwlqx57bpy

Stimulus-Dependent Assembly Formation of Oscillatory Responses: II. Desynchronization

Thomas B. Schillen, Peter König
1991 Neural Computation  
Stimulus-specific neuronal oscillations in the cat visual cortex: A cortical functional unit. Soc. Neurosci. Abstr. 13(404.3). Gray, C. M., and Singer, W. 1989.  ...  Furthermore, desyn- chronizing connections affect stimulus responses in a specific way as opposed to the effects of noise.  ... 
doi:10.1162/neco.1991.3.2.167 fatcat:zhapvrgumfcnteta6vops5m7bm

Nystagmus in patients with congenital stationary night blindness (CSNB) originates from synchronously firing retinal ganglion cells

Beerend H. J. Winkelman, Marcus H. C. Howlett, Maj-Britt Hölzel, Coen Joling, Kathryn H. Fransen, Gobinda Pangeni, Sander Kamermans, Hiraki Sakuta, Masaharu Noda, Huibert J. Simonsz, Maureen A. McCall, Chris I. De Zeeuw (+2 others)
2019 PLoS Biology  
We conclude that, in nob mice, synchronized oscillations of retinal GCs, most likely the ON-DCGCs, cause nystagmus with properties similar to those associated with CSNB in humans.  ...  These results show that the nob mouse is the first animal model for a form of congenital nystagmus, paving the way for development of therapeutic strategies.  ...  In the presence of a stimulus-containing contrast, the oscillations of nob ON-DSGCs are synchronized, and their integrated input to the AOS oscillates, representing a significant retinal slip signal, and  ... 
doi:10.1371/journal.pbio.3000174 pmid:31513577 pmcid:PMC6741852 fatcat:52pgsdn5gfa4fa4srffhwpu5im

Oculomotor Instabilities in Zebrafish Mutant belladonna: A Behavioral Model for Congenital Nystagmus Caused by Axonal Misrouting

Y.-Y. Huang, O. Rinner, P. Hedinger, S.-C. Liu, S. C. F. Neuhauss
2006 Journal of Neuroscience  
Some of these achiasmatic mutants display strong spontaneous eye oscillations (SOs) in the absence of motion in the surround.  ...  To mimic the achiasmatic condition, we reversed the sign of the retinal slip velocity in the model, thereby successfully reproducing both reversed OKR and SO.  ...  Accordingly, in the OKR model, the retinal slip velocity is the error signal to minimize the retinal slip.  ... 
doi:10.1523/jneurosci.2886-06.2006 pmid:17005851 fatcat:4qismvwqojdbxeyfaqc75fcuqe
« Previous Showing results 1 — 15 out of 6,536 results