Fig. 2: Spatial organization of oscillations and traveling waves (TW) in LPFC and PPC.
From: Beta traveling waves in monkey frontal and parietal areas encode recent reward history
A Locations of implanted Utah microarrays. The bottom panel shows the locations of the PPC (purple) and LPFC (yellow) grids, as estimated from stereotactic coordinates and intra-operative photographs and projected on a canonical 3D lateral view of the cortex from the diffusion tensor MRI atlas of the Rhesus macaque brain33,34. The top panel shows a closeup of the PPC array from Monkey Mc, highlighting the electrodes analyzed in (B). B A TW in a representative trial. The top panel shows the unfiltered continuous LFP signals from every other electrode in the group highlighted in (A). The middle panel is an expanded view of the same LFP traces, focusing on a smaller time window aligned on cue onset (0 ms). The bottom panel shows the signals at all five electrodes filtered at 14 Hz (Bandwidth 1.5 Hz). The peak phases of these oscillations (black dots) occur at successively later times for electrodes 1–5, thus demonstrating a TW. C Visualization of the TW across the recording array. The color shows several snapshots of the relative (cosine) phase of the 14-Hz LFPs across the array at 10-ms intervals. The blue arrow indicates the TW direction at −20 ms.
