Direction-selective motion discrimination by traveling waves in visual cortex
Fig 7
The spatial E-I-E model with asymmetric lateral coupling.
A: Schematic of the model where the spatial profiles of the excitatory projections, Ke1(x) and Ke2(x), are shifted in opposite directions. The lateral inhibitory projections (not shown) remain symmetric. B: Asymmetric Mexican hat constructed from Ke1(x + δ) and Ki(x) where δ = 0.02 mm. C: Asymmetric Mexican hat constructed from Ke2(x − δ) and Ki(x). Note the opposing phase shifts in the Mexican hat profiles.