were pooled across them. We recorded multi-unit activity (MUA) and local field potentials (LFPs) from 256 electrodes in four chronic arrays implanted bilaterally in both hemispheres of lateral PFC during task performance (Figure 1D). All presented statistics were based on nonparametric randomization tests across sessions, corrected for multiple comparisons across frequencies and time points (Benjamini and Yekutieli, 2001; see STAR methods for details).
