Fig 10. Spatiotemporal impulse-response function of relay cell.

Top: panels showing spatial receptive field at different times. Curves below panels are one-dimensional plots of the receptive fields as a function of x alone. Bottom left: x-t plot of receptive field. ON regions are shown in red (solid lines) while OFF regions are shown in blue (dashed lines). Bottom right: curve showing temporal evolution of ON region of the receptive field. The biphasic index I_BP is defined as the ratio between the peak magnitude of the (negative) rebound phase and the peak magnitude of the first (positive) phase. t_peak is the peak response latency. Note that only feedforward excitation from retinal ganglion cells to relay cells is included.