Open AccessSpace–time codependence of retinal ganglion cells can be explained by novel and separable components of their receptive fields
Author(s) -
Cowan Cameron S.,
Sabharwal Jasdeep,
Wu Samuel M.
Publication year - 2016
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.12952
Subject(s) - receptive field , visual space , asymmetry , retinal , separable space , linear correlation , neuroscience , homogeneity (statistics) , physics , computer science , biological system , mathematics , biology , mathematical analysis , medicine , ophthalmology , statistics , quantum mechanics , perception
Reverse correlation methods such as spike‐triggered averaging consistently identify the spatial center in the linear receptive fields ( RF s) of retinal ganglion cells ( GC s). However, the spatial antagonistic surround observed in classical experiments has proven more elusive. Tests for the antagonistic surround have heretofore relied on models that make questionable simplifying assumptions such as space–time separability and radial homogeneity/symmetry. We circumvented these, along with other common assumptions, and observed a linear antagonistic surround in 754 of 805 mouse GC s. By characterizing the RF 's space–time structure, we found the overall linear RF 's inseparability could be accounted for both by tuning differences between the center and surround and differences within the surround. Finally, we applied this approach to characterize spatial asymmetry in the RF surround. These results shed new light on the spatiotemporal organization of GC linear RF s and highlight a major contributor to its inseparability.