Fig. 3.

Phase-dependent coding. (A) Colored traces display the average information about the two target objects in firing rates measured as the percentage firing rate variance across trials explained by the identity of the first and second presented objects. Shaded regions indicate the SEM across sites (n = 140 sites). (B) Average normalized information in spikes during the second delay interval (2–3 s) about the identity of both objects as a function of local field potential frequency and phase (n = 103 pairs). Information (explained variance) was normalized by the average across phase. (C) Spectra of phase-dependent information for both objects during the second delay interval. Shaded regions indicate the bootstrap SEM across pairs (n = 103). Solid bars indicate significant phase dependence (P < 0.01 corrected, permutation test). Black triangles mark 3 and 32 Hz. Any phase dependence induced by stimulus-locked responses was discounted.