Figure 2.

Preferred stimulus reconstructions of three C2 cells after 0, 50, 150, and 500 presentations. At the top of each frame, the input image is shown with red, green, or blue squares, indicating the receptive fields of the cells that fired (if any). At the bottom, we reconstructed the preferred stimuli of the three cells: the left cell gradually becomes selective to foreheads, the middle one to noses and left eyes, and the right one to a global view of a face. Above each reconstruction, the number of postsynaptic spikes emitted is shown with the corresponding color. Figure modified from Masquelier and Thorpe (2006). See also the videos available online at: http://dx.doi.org/10.1371/journal.pcbi.0030031