Fig. 2.

A circuit model for RF remapping and population-response updating across saccades. (a) Recurrent connection strengths among model LIP/FEF cells as a function of the difference between the cells’ preferred retinotopic positions (cRF centers). Symmetric, center/surround connections (red) can be modulated by attention to produce convergent remapping and directional connections (blue, for rightward saccades) are gated by CDs to produce forward remapping (Wang et al., 2024). (b) Schematic of the backward updating of the second target (diamond) across the first saccade of the double-step task of Fig. 1. Circles indicate a few cells’ cRF center locations in retinotopic coordinates. The diamond is flashed at the cRF center of the magenta cell, evoking a population response among nearby cells (red curve above the magenta cell) which is sustained by the symmetric connections (not shown) as a memory. This population memory response is shifted backward (black arrow) by the CD-gated connections (blue lines) across the saccade, updating the diamond’s retinotopic position from the magenta arrow to the green arrow. Note that on the screen, the green cell’s fRF is at the magenta cell’s cRF for the first saccade; the green cell will be activated by flashes at positions from its cRF to fRF with progressively longer delays, as observed in the forward remapping time course (Wang et al., 2016; Wang et al., 2024).