In many areas of visual and visuomotor cortex, receptive fields (RFs) show anticipatory shifts to their future, post-saccadic location even before the onset of a saccade (Colby et al., 1995). Other studies suggest that during a saccade, RFs contract toward the location of the saccade target then later expand out to their final post-saccadic location (Chen et al., 2018; Neupane et al., 2016; Zirnsak et al., 2014). This implies a change in the population neural code for location around the time of a saccade because the ensemble responsive to a given location during the RF contraction will be different from those responsive to the same location before and after the saccade. This could explain the lack of cross-decoding between static and shifted memory traces (Figure 6C). These dynamics have yet to be demonstrated in PFC, but their properties in other areas argue against a role. RF contraction effects extend to only ~300 ms after a saccade in area V4 (Neupane et al., 2016) and the frontal eye field (Chen et al., 2018), whereas poor cross-decoding extends to over 500 ms
