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. 2014 Jul 24;9(7):e98424. doi: 10.1371/journal.pone.0098424

Figure 2. Receptive field and orientation selectivity.

Figure 2

(a) The receptive field structure of a CORF model cell (of size 30×30 pixels). The solid and dashed circles represent sub-units that take as input the responses of center-on and center-off LGN model cells, respectively. (b) and (c) show a closer look at two types of sub-units. The image in (b) illustrates a sub-unit whose output is a Gaussian-weighted summation of the responses of a pool of center-on DoG functions, while the image in (c) illustrates a sub-unit that integrates center-off DoG responses. The radius of each sub-unit is a function that grows linearly with the Euclidean distance from the receptive field's center of the CORF model cell. (d) A synthetic stimulus (of size 100×100 pixels) of bright-to-dark vertical edge and (e) the corresponding response image obtained by sliding the CORF receptive field in (a) across all locations of the stimulus in (d).