Document Detail


Asymmetry in neural fields: a spatiotemporal encoding mechanism.
MedLine Citation:
PMID:  23296700     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Neural field models have been successfully applied to model diverse brain mechanisms like visual attention, motor control, and memory. Most theoretical and modeling works have focused on the study of the dynamics of such systems under variations in neural connectivity, mainly symmetric connectivity among neurons. However, less attention has been given to the emerging properties of neuron populations when neural connectivity is asymmetric, although asymmetric activity propagation has been observed in cortical tissue. Here we explore the dynamics of neural fields with asymmetric connectivity and show, in the case of front propagation, that it can bias the population to follow a certain trajectory with higher activation. We find that asymmetry relates linearly to the input speed when the input is spatially localized, and this relation holds for different kernels and input shapes. To illustrate the behavior of asymmetric connectivity, we present an application: standard video sequences of human motion were encoded using the asymmetric neural field and compared to computer vision techniques. Overall, our results indicate that asymmetric neural fields are a competitive approach for spatiotemporal encoding with two main advantages: online classification and distributed operation.
Authors:
Mauricio Cerda; Bernard Girau
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-8
Journal Detail:
Title:  Biological cybernetics     Volume:  -     ISSN:  1432-0770     ISO Abbreviation:  Biol Cybern     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502533     Medline TA:  Biol Cybern     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Laboratory for Scientific Image Analysis (SCIAN-LAB) at the Program of Anatomy and Developmental Biology and the Biomedical Neuroscience Institute BNI, ICBM, Faculty of Medicine, Universidad de Chile, Independencia, 1027 , Santiago, Chile, mauriciocerda@med.uchile.cl.
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