Direction-selective motion discrimination by traveling waves in visual cortex
Fig 8
Direction-selective responses in the spatial E-I-E model.
The cells in layer e1 were tuned to leftward motion (δ = +0.02) and those in layer e2 were tuned to rightward motion (δ = −0.02). The external stimulus J(x, t) was applied identically to both layers. Their spatiotemporal responses are Ue1(x, t) and Ue2(x, t). A: Case of a leftwards moving grating (fx = 2.5 cycles/mm, ft = −15 Hz) which resonates with the endogenous wave in Ue1. B: Case of a rightwards moving grating (fx = 2.5 cycles/mm, ft = +15 Hz) which resonates the endogenous wave in Ue2. C: Case of a stationary grating (fx = 2.5 cycles/mm, ft = 0 Hz) which does not resonate with either.