Functional and physiological models as revealed by visual receptive field structure

2000 ◽  
Vol 38 ◽  
pp. S12
Author(s):  
I Ohzawa
Keyword(s):  
Receptive Field ◽  
Field Structure ◽  
Physiological Models ◽  
Visual Receptive Field

scholarly journals Visual Receptive Field Structure of Cortical Inhibitory Neurons Revealed by Two-Photon Imaging Guided Recording

2009 ◽  
Vol 29 (34) ◽  
pp. 10520-10532 ◽  
Author(s):  
B.-h. Liu ◽  
P. Li ◽  
Y.-t. Li ◽  
Y. J. Sun ◽  
Y. Yanagawa ◽  
...  
Keyword(s):  
Receptive Field ◽  
Field Structure ◽  
Inhibitory Neurons ◽  
Two Photon ◽  
Visual Receptive Field ◽  
Photon Imaging ◽  
Two Photon Imaging

DEVELOPMENT OF FEEDFORWARD RECEPTIVE FIELD STRUCTURE OF A SIMPLE CELL AND ITS CONTRIBUTION TO THE ORIENTATION SELECTIVITY: A MODELING STUDY

2005 ◽  
Vol 15 (01n02) ◽  
pp. 55-70 ◽  
Author(s):  
AKHIL R GARG ◽  
KLAUS OBERMAYER ◽  
BASABI BHAUMIK
Keyword(s):  
Receptive Field ◽  
Field Structure ◽  
Orientation Selectivity ◽  
Simple Cell ◽  
Homogeneous State ◽  
Synaptic Efficacy ◽  
Synaptic Interactions ◽  
Experimental Findings ◽  
Modeling Study

Recent experimental studies of hetero-synaptic interactions in various systems have shown the role of signaling in the plasticity, challenging the conventional understanding of Hebb's rule. It has also been found that activity plays a major role in plasticity, with neurotrophins acting as molecular signals translating activity into structural changes. Furthermore, role of synaptic efficacy in biasing the outcome of competition has also been revealed recently. Motivated by these experimental findings we present a model for the development of simple cell receptive field structure based on the competitive hetero-synaptic interactions for neurotrophins combined with cooperative hetero-synaptic interactions in the spatial domain. We find that with proper balance in competition and cooperation, the inputs from two populations (ON/OFF) of LGN cells segregate starting from the homogeneous state. We obtain segregated ON and OFF regions in simple cell receptive field. Our modeling study supports the experimental findings, suggesting the role of synaptic efficacy and the role of spatial signaling. We find that using this model we obtain simple cell RF, even for positively correlated activity of ON/OFF cells. We also compare different mechanism of finding the response of cortical cell and study their possible role in the sharpening of orientation selectivity. We find that degree of selectivity improvement in individual cells varies from case to case depending upon the structure of RF field and type of sharpening mechanism.

scholarly journals Parallel ON and OFF Cone Bipolar Inputs Establish Spatially Coextensive Receptive Field Structure of Blue-Yellow Ganglion Cells in Primate Retina

2009 ◽  
Vol 29 (26) ◽  
pp. 8372-8387 ◽  
Author(s):  
J. D. Crook ◽  
C. M. Davenport ◽  
B. B. Peterson ◽  
O. S. Packer ◽  
P. B. Detwiler ◽  
...  
Keyword(s):  
Receptive Field ◽  
Ganglion Cells ◽  
Field Structure
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