# Edge statistics in natural images versus laboratory animal environments: implications for understanding lateral connectivity in V1

Slides:: slides

 Natural Laboratory Probability distribution function of "chevrons" in natural and laboratory images. By computing measures of the independence of the different variables, we found that the probability density function of the second-order statistics of edges factorizes with on one side distance and scale and on the other side the 2 angles. The first component proved to be quite similar across both classes and the greater difference is seen for different angle configuration. As it can be reduced to 2 dimensions, we can plot the full probability as shown here by different contrast values assigned to all possible chevrons configurations, for all possible "azimuth" values $\phi$ on the horizontal axis and difference of orientation $\theta$ on the vertical axis. Such a plot most strikingly shows the difference between these 2 classes.

## reference

• Laurent Perrinet, David Fitzpatrick, James A. Bednar. Edge statistics in natural images versus laboratory animal environments: implications for understanding lateral connectivity in V1, URL . In iTWIST '12 workshop, 2012 abstract.

 This work was supported from the European Community’s Seventh Framework Program FP7/2007-2013 under grant agreement number 214728-2, "CODDE".

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