Receptive fields of model V1 units after training on natural images.

<p>(A) Examples of natural images used for training. The square denotes model V1 receptive field size. (B) V1 receptive fields after training. Plots are scaled in magnitude so that each fills the gray scale, but with zero always represented by the same gray level. Black depicts off-regions in the model V1 receptive field, white depicts on-regions.