Figure 2: (a) shows a 1 × 4 subsection of the 9 × 9 receptive field of ts-WTA cells that form a disparity selective cell. The output of each ts-WTA is connected in a feed-forward manner using MOSFETs with their drains connected together giving out the response of the cell. The output of each cell is also connected at the diffusion node with feedback resistances (1 k each). The cell’s output and diffusion nodes are separated by a buffer device that only allows the cells output to affect the diffusion node voltage but the diffusion node voltage cannot affect the output node voltage directly. The bias transistor acts like a current source with fixed resources. (b) shows the symbol for the disparity selective cell. (c) shows the circuit level description of the buffer device (adapted from Gupta and Markan, 2014, [15]).