Our results thus far suggest transfer of WM traces between prefrontal hemispheres. If so, we should expect to see evidence of communication between hemispheres around the time of putative transfer. We would further expect signals to flow causally from the hemisphere contralateral to the initial sample hemifield (the ‘‘sender’’) toward the hemisphere contralateral to the post-saccade hemifield (the ‘‘receiver’’). Evidence suggests that phase synchrony between cortical areas helps regulate the flow of information (Fries, 2015). Thus, we measured oscillatory synchrony between LFPs in the two prefrontal hemispheres using pairwise phase consistency (PPC), an unbiased measure of phase synchrony (Figure 7).
