Filters








30,496 Hits in 6.9 sec

Theoretical analysis of reverse-time correlation for idealized orientation tuning dynamics

Gregor Kovačič, Louis Tao, David Cai, Michael J. Shelley
2008 Journal of Computational Neuroscience  
A theoretical analysis is presented of a reverse-time correlation method used in experimentally investigating orientation tuning dynamics of neurons in the primary visual cortex.  ...  Various mathematical consequences and possible physiological implications of this analysis are illustrated using exactly solvable idealized models of orientation tuning.  ...  G.K. was supported by NSF grants IGMS-0308943 and DMS-0506287, and gratefully acknowledges the hospitality of the Courant Institute of Mathematical Sciences and Center for Neural Science during his  ... 
doi:10.1007/s10827-008-0085-7 pmid:18392931 fatcat:2lqnphtyxnhztm2vy2xzg5ityu

Reverse correlation in neurophysiology

D RINGACH, R SHAPLEY
2004 Cognitive Science  
Recent results obtained by applying such methods in the orientation, spatial-frequency and Fourier domains have revealed the importance of cortical inhibition in the establishment of sharp tuning selectivity  ...  This article presents a review of reverse correlation in neurophysiology. We discuss the basis of reverse correlation in linear transducers and in spiking neurons.  ...  simple, "unimodal" dynamics and are relatively broadly tuned for orientation.  ... 
doi:10.1016/j.cogsci.2003.11.003 fatcat:ajbzb4y2rffgza477tlrlhktxe

Reverse correlation in neurophysiology

Dario Ringach, Robert Shapley
2004 Cognitive Science  
Recent results obtained by applying such methods in the orientation, spatial-frequency and Fourier domains have revealed the importance of cortical inhibition in the establishment of sharp tuning selectivity  ...  This article presents a review of reverse correlation in neurophysiology. We discuss the basis of reverse correlation in linear transducers and in spiking neurons.  ...  simple, "unimodal" dynamics and are relatively broadly tuned for orientation.  ... 
doi:10.1207/s15516709cog2802_2 fatcat:g653sgjnxvdlheplzl5xlxmpjm

Temporal Dynamics of Binocular Disparity Processing in the Central Visual Pathway

Michael D. Menz, Ralph D. Freeman
2004 Journal of Neurophysiology  
In this study, we investigate dynamic changes in disparity tuning of simple and complex cells in the cat's striate cortex over a short time span.  ...  This discrepancy suggests the possibility of a dynamic nonlinearity or disparity specific feedback that alters tuning or a combination of both mechanisms.  ...  Holm for technical support.  ... 
doi:10.1152/jn.00571.2003 pmid:14668292 fatcat:qzzn53ww6vhcxnn3ncb66cakci

Large-Scale Computational Modeling of the Primary Visual Cortex [chapter]

Aaditya V. Rangan, Louis Tao, Gregor Kovačič, David Cai
2009 Coherent Behavior in Neuronal Networks  
the model dynamics.  ...  The main objectives of our modeling are to (i) capture groups of experimentally observed phenomena in a single theoretical model of cortical circuitry, and (ii) identify the physiological mechanisms underlying  ...  The manifestations of selectivities such as orientation tuning are actually strongly dynamical, as revealed by reverse-time correlation experiments [93, 94] , which reveal some of the time-scales operative  ... 
doi:10.1007/978-1-4419-0389-1_14 fatcat:w66ues4f7rbflgyxiisuhmbxzm

Accuracy of Subspace Mapping of Spatiotemporal Frequency Domain Visual Receptive Fields

Shinji Nishimoto, Miki Arai, Izumi Ohzawa
2005 Journal of Neurophysiology  
For many cells, the optimal spatial frequency shifts substantially, measured as a fraction of tuning bandwidth, over the time course of response.  ...  Temporal dynamics of tuning properties are also examined more directly with the subspace mapping than with the drifting gratings.  ...  Temporal dynamics of tuning characteristics We have examined the dynamics of optimal orientation and optimal spatial frequency over the time course of responses and have shown that the preferred spatial  ... 
doi:10.1152/jn.01169.2004 pmid:15647396 fatcat:yo32fgzrcjhqbjjhkzeqlnarsm

Receptive Field Properties of Neurons in the Early Visual Cortex Revealed by Local Spectral Reverse Correlation

S. Nishimoto
2006 Journal of Neuroscience  
We introduce a novel class of white-noise analyses, named local spectral reverse correlation (LSRC), which is capable of revealing various aspects of visual receptive field profiles that were undetectable  ...  A dynamic dense noise pattern was presented in which the pattern covered an area two to three times larger than the classical receptive field.  ...  To extend the reverse correlation method for studying details of the early visual cortical areas and for possible uses in extrastriate areas, we have developed a new class of white-noise analysis, named  ... 
doi:10.1523/jneurosci.4558-05.2006 pmid:16554477 fatcat:srqdzooj6vcjvnrgewbnr624oq

Analysis of sensory coding with complex stimuli

J Touryan
2001 Current Opinion in Neurobiology  
Acknowledgements We thank Brian Lau and Frederic Theunissen for helpful comments on the manuscript.  ...  This work is supported by grants from the National Eye Institute (R01 EY12561-01) and the Office of Naval Research (N00014-00-1-0053). References and recommended reading  ...  [18] [19] [20] presented sinusoidal gratings flashed at a random sequence of orientations and spatial frequencies, and applied reverse correlation to measure the dynamic tuning of V1 neurons.  ... 
doi:10.1016/s0959-4388(00)00232-4 pmid:11502390 fatcat:xe6p52uqirgvhihagzizagu46u

Dynamical solid-liquid transition through oscillatory shear [article]

Eric Brillaux, Francesco Turci
2018 arXiv   pre-print
Starting from an ideal crystalline state, we numerically study a nonequilibrium dynamical order- disorder transition promoted by the application of a periodic shearing protocol at low temperatures in model  ...  Through the analysis of large-scale simulations, we show that the amorphization mechanism around the discontinuous transition is reminiscent of spinodal decomposition.  ...  Jack for insightful discussions. This work was carried out using the computational facilities of the Advanced Computing Research Centre, University of Bristol.  ... 
arXiv:1809.08874v1 fatcat:p53vgs2pq5axbk3bd2uw2xm5mi

Cortical-like dynamics in recurrent circuits optimized for sampling-based probabilistic inference [article]

Rodrigo Echeveste, Laurence Aitchison, Guillaume Hennequin, Mate Lengyel
2019 bioRxiv   pre-print
Sensory cortices display a suite of ubiquitous dynamical features, such as ongoing noise variability, transient overshoots, and oscillations, that have so far escaped a common, principled theoretical account  ...  Our results suggest that the basic motifs of cortical dynamics emerge as a consequence of the efficient implementation of the same computational function -fast sampling-based inference- and predict further  ...  While Langevin sampling relies on time-325 reversible dynamics-i.e. any time series of re-326 sponses is as probable as its time-reversed coun-327 terpart, and thus cross correlations in the net-328 work  ... 
doi:10.1101/696088 fatcat:dxkeq7y43zfg3l3jdnvmlxu7u4

Feature expectation heightens visual sensitivity during fine orientation discrimination

Sam Cheadle, Tobias Egner, Valentin Wyart, Claire Wu, Christopher Summerfield
2015 Journal of Vision  
In a psychophysical reverse correlation analysis, the energy in the stimulus is directly linked to the choices made by the participants, either by computing the excess rate (as a function of response)  ...  Analysis Conventional decision theoretic statistics were calculated according to standard formulae (Stanislaw & Todorov, 1999) and compared using analysis of variance (ANOVA).  ... 
doi:10.1167/15.14.14 pmid:26505967 pmcid:PMC4633117 fatcat:pt3mhdr6fnb47jtoydvplwp3ai

Orbital Control on Carbonate-Lignite Cycles in the Ptolemais Basin, Northern Greece - An Integrated Stratigraphic Approach [chapter]

M.E. Weber, N. Tougiannidis, W. Ricken, C. Rolf, I. Oikonomopoulos, P. Antoniadis
2012 Stratigraphic Analysis of Layered Deposits  
Antonis Nikou (Drilling Section), as well as Daniela Sprenk and Andreas Holzapfel (both University of Cologne) for technical assistance.  ...  Acknowledgments We thank the Public Power Corporation (Ptolemaida) for granting permission to work in their quarries. Also, we wish to thank Greek colleagues Mr.  ...  and L* versus orbital insolation at 40°N for the month of June (data from Fig. 6 . 6 Spectral analysis of color component L* for borehole KAP-107 for two time slices 4.2 -3.7 Ma (left) and 3.6 -3.35  ... 
doi:10.5772/35411 fatcat:lj2cb5a425ecxk6a4vbohfn6ni

Relaxation in binary mixtures: Non-ideality, heterogeneity and re-entrance

Arnab Mukherjee, Goundla Srinivas, Sarika Bhattacharyya, Biman Bagchi
2001 Proceedings of the Indian Academy of sciences. Chemical sciences  
(a) Non-ideality in composition dependence of viscosity, (b) re-entrant behaviour of orientational relaxation, and (c) heterogeneity in supercooled binary mixtures.  ...  The physical origin of the dynamical behaviour of binary mixtures can be understood in terms of composition fluctuation, a study of which has also been presented in this paper.  ...  This work was supported in part by grants from the Department of Science and Technology (DST), and the Council of Scientific and Industrial Research (CSIR), India. GS thanks the CSIR for a fellowship.  ... 
doi:10.1007/bf02708779 fatcat:dyvbdc5shvae3oubdxebuv7dhm

Spatiotemporal organization of simple-cell receptive fields in the cat's striate cortex. II. Linearity of temporal and spatial summation

G. C. DeAngelis, I. Ohzawa, R. D. Freeman
1993 Journal of Neurophysiology  
Overall, these findings show that spatiotemporal receptivefield profiles obtained with the use of reverse correlation may be used to predict a variety of response properties for simple cells.  ...  Fourier analysis of spatiotemporal receptive-field profiles yields linear predictions of the cells' spatial and temporal frequency tuning.  ...  Corrected estimates of the measured and predicted DSI are shown for eight simple cells in Fig. 1 OB ( 0) . We are grateful to G.  ... 
doi:10.1152/jn.1993.69.4.1118 pmid:8492152 fatcat:4imeoa664jc5pe77sypegn4cwi

Tuning ice nucleation with counterions on polyelectrolyte brush surfaces

Z. He, W. J. Xie, Z. Liu, G. Liu, Z. Wang, Y. Q. Gao, J. Wang
2016 Science Advances  
counterions, we show that our molecular dynamics simulation analysis is consistent with the experimental observation of the ion-specific effect on HIN.  ...  efficiency of ions in tuning HIN follows the Hofmeister series.  ...  Z.H., W.J.X., and J.W. wrote the initial draft of the manuscript. Z.W. and G.L. contributed to the analysis of the data.  ... 
doi:10.1126/sciadv.1600345 pmid:27386581 pmcid:PMC4928907 fatcat:ixzysqswp5enliykeyeukq5v34
« Previous Showing results 1 — 15 out of 30,496 results